TREATMENT OF DERMATOLOGICAL ALLERGIC CONDITIONS
FIELD OF THE INVENTION
This invention is directed to a method of therapy for human and non-human patients
suffering from, or subject to, dermatological allergic conditions.
BACKGROUND OF THE INVENTION
Mast cell mediated inflammatory conditions are a growing public health concern.
Tryptase is stored in mast cell secretory granules and is the major protease of human mast
cells. Tryptase has been implicated in a variety of biological processes, including degradation
of vasodilatory and bronchodilatory neuropeptides (Caughey, et al., J . Pharmacol. Exp. Ther.,
1988, 244, pages 133-137; Franconi, et al, J . Pharmacol. Exp. Ther., 1988, 248, pages 947-
951; and Tarn, et al, Am. J . Respir. Cell Mol. Biol, 1990, 3, pages 27-32).
As a result, tryptase inhibitors may be useful as anti-inflammatory agents (K Rice,
P.A. Sprengler, Current Opinion in Drug Discovery and Development, 1999, 2(5), pages 463-
474), and may be useful in treating or preventing dermatological allergic conditions such as
atopic dermatitis (A. Jarvikallio et al, Br. J . Dermatol., 1997, 136, pages 871-877).
Such a compound should readily have utility in treating a patient suffering from
conditions that can be ameliorated by the administration of an inhibitor of tryptase, e.g., mast
cell mediated inflammatory conditions, inflammation, and diseases or disorders related to the
degradation of vasodilatory neuropeptides, and have diminished liability for semicarbazidesensitive
amine oxidase (SSAO) metabolism.
The compound of formula I (Compound A) is a selective and reversible inhibitor of
human beta-tryptase and mouse MCPT-6 (mouse orthologue of human beta-tryptase) with Ki
on recombinant enzymes of 38 and 920 nM, respectively.
Formula I
SUMMARY OF THE INVENTION
We have now found that a compound of Formula I, or its pharmaceutically acceptable
salts, is useful for the treatment of inflammatory bowel disease.
Namely, this invention relates to a prophylactic or therapeutic drug for dermatological
allergic conditions, in particular atopic dermatitis, containing, as the active constituent, a
compound or salt thereof represented by Formula I .
A method is also disclosed for the treatment of dermatological allergic conditions, in
particular atopic dermatitis, in a mammal comprising the step of administering a
pharmaceutically effective amount of a compound represented by Formula I below or as
pharmaceutically acceptable salt thereof.
Formula I
This compound is also known as [4-(5-Aminomethyl-2-fluorophenyl)piperidine-lyl]
[7-fluoro- 1-(2-methoxyethyl)-4-trifluoromethoxy- 1H-indol-3-yl]methanone.
This invention is directed to a compound of Formula I, which has now been found to
be active in an animal model for dermatological allergic conditions, and in particular for
atopic dermatitis.
Another aspect of the present invention is a pharmaceutical composition for treating
dermatological allergic conditions.
Another aspect of the present invention is a treatment for atopic dermatitis.
Yet another aspect of the present invention is a treatment for atopic dermatitis by
treating a patient with a beta-tryptase inhibitor in general.
DETAILED DESCRIPTION OF THE INVENTION
Thus, in one aspect, the present invention is directed to pharmaceutical compositions
comprising a compound of general Formula I, which also may be known as: [4-(5-
Aminomethyl-2-fluorophenyl)piperidine- 1-yl] [7-fluoro-1-(2-methoxyethyl)-4-
trifluoromethoxy-lH-indol-3-yl]methanone or Compound A.
In the present specification, the term "compound of the invention", and equivalent
expressions, are meant to embrace a compound of general formula (I) as hereinbefore
described, which expression includes the ester prodrugs, the pharmaceutically acceptable salts,
and the solvates, e.g. hydrates, where the context so permits. Similarly, reference to
intermediates, whether or not they themselves are claimed, is meant to embrace their salts, and
solvates, where the context so permits. For the sake of clarity, particular instances when the
context so permits are sometimes indicated in the text, but these instances are purely
illustrative and it is not intended to exclude other instances when the context so permits.
Preparatory Details
The compound of formula I may be prepared by the application or adaptation of
known methods, by which is meant methods used heretofore or described in the literature, for
example those described by R.C.Larock in Comprehensive Organic Transformations, VCH
publishers, 1989, or as described herein.
In the reactions described hereinafter it may be necessary to protect reactive functional
groups, for example, amino groups, to avoid their unwanted participation in the reactions.
Conventional protecting groups may be used in accordance with standard practice, for
examples see T.W. Greene and P.G.M.Wuts in "Protective Groups in Organic Chemistry"
John Wiley and Sons, 1991.
In particular, the compound of formula I may be prepared as shown through Schemes
1-2.
For example, the compound of the present invention is an achiral compound whose
preparation is comprised of a convergent synthesis. The compound of the invention, as its
benzoate salt, is prepared as shown in the schemes below.
Scheme 1
(i) Ethyl chloroformate, pyridine, THF, 0 °C, 100%; (ii) a : sec-BuU, THF, -78 °C, b : I2,
THF, -78 °C, 52-68%; (iii) TMS-acetylene, TEA, Cul, Pd(PPh3)2Cl2, degassed THF, 60
°C, 93%; (iv) KOH, t-BuOH, 70 °C, 91%; (v) Powder KOH, 2-methoxyethyl bromide,
DMSO, rt, 95%; (vi) TFAA, DMF, 40 °C, 89%; (vii) 5M NaOH, MeOH, 85 °C, 96%;
(viii) 2,2,2-Trifluoro -N-(fluoro-3-piperidin-4-yl-benzyl)-acetamide hydrochloride, EDCI,
TEA, CH2C 12 (DCM), rt, 99%; (ix) a : K2C0 3, MeOH/H20 , b : 1M HCl in Et20 , 90% '
Compound 1 is converted to compound 2 by protecting the amino group with an
protecting agent, such as ethyl chloroformate in the presence of a suitable base, such as
pyridine, to yield protected compound 2 .
Compound 2 is converted to compound 5 in a three step process. Compound 2 is
iodinated in the position next to the carbamic ester by reacting 2 with a strong base such as
secondary butyl lithium to form the anion which is reacted with an iodide source such as
molecular iodine to give compound 3. Compound 3 is then converted to acetylenic compound
4 using catalytic conditions such as copper (I) iodide and bistriphenylphosphine palladium (II)
dichloride in the presence of trimethylsilylacetylene and base such as triethylamine.
Compound 4 is cyclized using a strong base such as potassium hydroxide and heating to give
indole compound 5.
Compound 5 is converted to compound 6 by alkylating the indole nitrogen thereof
with an alkyl halide in the presence of a strong base, such as a potassium hydroxide, in a
dipolar aprotic solvent, such as dimethylsulfoxide, at room temperature to yield compound 6.
Compound 6 is converted to compound 8 in a two step process. First, compound 6 is
converted to compound 7 by treating compound 6 with trifluoroacetic anhydride in the
presence of a solvent such as N N-dimethylformamide and heating. Compound 7 is treated
with a strong base such as sodium hydroxide to give compound 8 which has an acid function
in the 3-position thereof.
Compound 8 is converted to amide 9 by reacting acid 8 with 2,2,2-trifluoro-N-(fluoro-
3-piperidin-4-yl-benzyl)-acetamide hydrochloride (compound 14) in the presence of an acid
coupling reagent such as EDCI and an organic base such as triethylamine in an inert solvent
such as dichloromethane.
Compound 9 is converted to compound 10 by deprotecting N-benzyl
trifluoroacetamide on treatment with mild base, such as potassium carbonate, in solvent
mixture, such as methanol/water. The hydrochloride salt can be formed in the presence of a
polar organic solvent, such as ether, to yield compound 10 which is the hydrochloride salt of
([4-(5-aminomethyl-2-fluoro-phenyl)-piperidin- 1-yl]-[7-fluoro- 1-(2-methoxy-ethyl)-4-methyllH-
indol-3-yl]-methanone) in formula I .
The reactions of this scheme are as follows.
Step A: Preparation of (2-Fluoro-5-trifluoromethoxy-phenyl)-carbamic acid ethyl ester
(2)
commercially available
To a solution of 1 (50.72 g, 0.26 mol) and pyridine (27.3 mL, 0.34 mol) in THF (500
mL) at 0 °C is added ethyl chloroformate (32.2 mL, 0.39 mol) dropwise over a 30 min period.
After 1 h, both LC/MS and TLC indicate that the reaction is completed. The reaction mixture
is partitioned between H20 and EtOAc. The two layers are separated, and the organic layer is
washed with 1M HC1, H20 , and brine, dried over MgS0 4, filtered, and concentrated in vacuo.
The crude material is purified on silica gel with heptane/EtOAc (95/5 to 70/30) as eluant to
give 69.23 g (99%) of the product 2 as a clear colorless liquid. 1H NMR (CDC13) 8.11 (br s,
1H), 7.07 (dd, J = 9.1, 9.3 Hz, 1H), 7.00-6.80 (m, 2H), 4.27 (q, J =7.1 Hz, 2H), 1.33 (t, J =
7.1 Hz, 3H); 1 F NMR (CDC13) -57.84 (s, 3F), -134.01 (br s, IF); MS 309 (M+CH3CN+1,
100%), 268 (M+l).
Step B: Preparation of (6-Fluoro-2-iodo-3-trifluoromethoxy-phenyl)-carbamic acid ethyl
este
To a solution of 2 (31.34 g, 117.2 mmol) in THF (180 mL) at -78 °C is added sec-
BuLi (1.4 M in cyclohexane, 200 mL, 280 mmol) dropwise over a 1 h period. After 20 min, a
solution of I2 (44.6 g, 175.8 mmol) in THF (150 mL) is added dropwise over a 30 min period.
This mixture is then stirred at -78 °C for 30 min. Saturated NH4C 1 is added, and the cooling
bath is removed. The reaction mixture is partitioned between H20 and EtOAc. The two
layers are separated, and the organic layer is washed with 10% Na2S03, H20 , and brine, dried
over MgS04, filtered, and concentrated in vacuo. The residue is suspended in DCM (50 mL),
and heptane (300 mL) is added. The white powder 3 (18.1 g, 39%>) from the resulting
suspension is collected by suction filtration and air-dried. The filtrate is concentrated in
vacuo, and the residue is suspended in heptane (200 mL). Another batch of 3 (3.8 g, 8%) is
collected by suction filtration and air-dried. Additional product can be obtained by purifying
the filtrate via silica gel chromatography. 1H NMR (CDC13) 7.30-17.10 (m, 2H), 6.16 (br s,
1H), 4.26 (q, J = 7.1 Hz, 2H), 1.32 (t, J = 7.1 Hz, 3H); 1 F NMR (CDC13) -56.90 (s, 3F), -
114.35 (d, J = 8.5 Hz, IF); MS 394 (M+l, 100%), 374, 364, 321, 267.
Step C: Preparation of (6-Fluoro-3-trifluoromethoxy-2-trimethylsilanylethynyl-phenyl)-
carbamic acid ethyl ester (4)
A mixture of 3 (18.1 g, 45.9 mmol), Et3N (12.8 mL, 91.9 mmol), Pd(PPh) 2Cl2 (1.6 g,
5% mol), Cul (0.7 g, 8% mol), and TMS-acetylene (19.6 mL, 137.8 mmol) in degassed THF
(180 mL) is heated at 60 °C overnight. The mixture is cooled to rt, and then partitioned
between H20 and EtOAc. This mixture is filtered through Celite to remove the insoluble
material. The two layers of the filtrate are separated, and the organic layer is washed H20 and
brine, dried over MgS0 4, filtered, and concentrated in vacuo. The crude material is purified
on silica gel with heptane/EtOAc as eluant to give 15.6 g (93%>) of the product 4 as beige
solid. 1H NMR (CDC13) 7.15-7.00 (m, 2H), 6.41 (br s, 1H), 4.26 (q, J = 7.1 Hz, 2H), 1.31 (t,
J =7.1 Hz, 3H), 0.27 (s, 9H); 1 F NMR (CDC13) -57.59 (s, 3F), - 118.15 (s, IF); MS 364
(M+l, 100%).
Step D: Preparation of 7-Fluoro-4-trifluoromethoxy-l H-indole (5)
A mixture of 4 (28.9 g, 79.6 mmol) and (35.7 g, 636.7 mmol) in degassed t-
BuOH (300 mL) is heated at 70 °C overnight. LC/MS indicates the reaction is completed.
The mixture is cooled to rt, and then partitioned between H20 and Et20 . The two layers are
separated, and the aqueous layer was extracted with Et20 (2X). The combined organic layers
are washed with H20 and brine, dried over MgS0 4, filtered, and concentrated in vacuo. The
crude material is purified on silica gel with heptane/EtOAc (100/0 to 60/40) as eluant to give
16 g (91%) of 5 as a yellow liquid. 1H NMR (CDC13) 8.47 (br s, 1H), 7.35-7.20 (m, 1H),
6.95-6.80 (m, 2H), 6.68 (d, J =2.5 Hz, 1H); 1 F NMR (CDC13) -57.63 (s, 3F), -136.10 (d, J
= 8.5 Hz, IF); MS 220 (M+l, 100%), 200.
Step E: Preparation of 7-Fluoro-l-(2-methoxy-ethyl)-4-trifluoromethoxy-l H-indole (6)
A mixture of 5 (16 g, 72.8 mmol) and powder KOH (20.4 g, 364.2 mmol) in DMSO
(150 mL) is stirred at rt for 10 min. 2- Methoxy ethyl bromide (10.3 mL, 109.2 mmol) is
added. This mixture is stirred at rt overnight. LC/MS indicates the reaction is completed.
The mixture is partitioned between H20 and Et20 . The two layers are separated, and the
aqueous layer is extracted with Et20 (2X). The combined organic layers are washed with H20
and brine, dried over MgS0 4, filtered, and concentrated in vacuo. The crude material is
purified on silica gel with heptane/EtOAc (100/0 to 50/50) as eluant to give 19.3 g (95%>) of 6
as a yellow liquid. 1H NMR (CDC13) 7.15 (d, J =2.1 Hz, 1H), 6.90-6.75 (m, 2H), 6.56 (t, J
= 2.5 Hz, 1 H), 3.72 (t, J =5.2 Hz, 2H), 3.72 (t, J = 5.2 Hz, 2H), 3.31 (s, 3H); F NMR
(CDCls) -57.54 (s, 3F), -137.00 (d, J = 11.3 Hz, IF); MS 278 (M+l, 100%).
Step F: Preparation of 2,2,2-Trifluoro-l-[7-fluoro-l-(2-methoxy-ethyl)-4-
trifluoromethoxy-l H-indol-3-yl]-ethanone (7)
To a mixture of 6 (19.3 g, 69.7 mmol) in DMF (135 mL) is added TFAA (26.2 mL,
188.2 mmol). This mixture is heated at 40 °C overnight. TLC indicates the reaction is
completed. The mixture is cooled to rt, and then partitioned between H20 and Et20 . The two
layers are separated, and the organic layer is washed with saturated NaHC0 3 (2X), H20 and
brine, dried over MgSC^, filtered, and concentrated in vacuo. The crude material is purified
on silica gel with heptane/EtOAc (100/0 to 50/50) as eluant to give 23.4 g (89%) of 7 as a
slightly green solid. 1H NMR (CDC13) 8.03 (d, J = 1.4 Hz, 1H), 7.20-6.95 (m, 2H), 4.54 (t, J
= 4.9 Hz, 2H), 3.76 (t, J =4.8 Hz, 2H), 3.33 (s, 3H); 1 F NMR (CDC13) -57.74 (s, 3F), -
71.10 (s, 3F), -134.95 (d, J = 11.5 Hz, IF); MS 374 (M+l, 100%).
Step G: Preparation of 7-Fluoro-l-(2-methoxy-ethyl)-4-trifluoromethoxy-l H-indole-3-
carboxylic acid 8)
A mixture of 7 (23.4 g, 62.6 mmol) in MeOH (100 mL) and 5 M NaOH (100 mL) is
heated at 80 °C overnight. LC/MS indicates that the reaction is complete. The reaction
mixture is cooled to rt, and then concentrated in vacuo to remove most of the MeOH. The
residue is dissolved in H20 , and then washed with Et20 once. The aqueous layer is slowly
acidified to pH 2 with cone. HCl. The acidified suspension is extracted with Et20 , and the
organic extract is washed with H20 and brine, dried over MgS0 4, filtered, and concentrated in
vacuo. The residue is suspended in DCM/heptane (10/90). The white powder 8 (19.4 g, 96%)
in the suspension is collected by suction filtration and air-dried. 1H NMR (CDCI3) 8.02 (s,
1H), 7.15-7.05 (m, 1H), 7.00-6.90 (m, 1H), 4.49 (t, J = 5.0 Hz, 2H), 3.75 (t, J =4.9 Hz, 2H),
3.33 (s, 3H); 1 F NMR (CDC13) -57.74 (s, 3F), -135.65 (d, J = 11.3 Hz, IF); MS 363
(M+CH3CN+I), 322 (M+l, 100%).
Step H: Preparation of 2,2,2-Trifluoro-7V-(4-fluoro-3-{l-[7-fluoro-l-(2-methoxy-ethyl)-4-
trifluoromethoxy-l H-indole-3-carbonyl]-piperidin-4-yl}-benzyl)-acetamide (9)
A mixture of 8 (19.1 g, 59.6 mmol), Et3N (24.8 mL, 177.9 mmol), 2,2,2-trifiuoro -N-(4-
fluoro-3-piperidin-4-yl-benzyl)-acetamide hydrochloride ( 11, 26.4 g, 77.5 mmol) (14), and
EDCI (17.1 g, 89.3 mmol) in CH2C 12 is stirred at rt overnight. Both TLC and LC/MS indicate
that the reaction is completed. The mixture is partitioned between H20 and CH2C 12. The two
layers are separated, and the organic layer is washed with brine, dried over MgS0 4, filtered,
and concentrated in vacuo. The crude material is purified on silica gel with heptane/EtOAc
(40/60 to 0/100) as eluant to give 9 (36 g, 99%) as a white foam. 1H NMR (CDC13) 7.37 (s,
1H), 7.20-7.10 (m, 2H), 7.10-6.85 (m, 4H), 4.95 (br s, 1H), 4.60-4.35 (m, 4H), 3.90 (br s, 1
H), 3.73 (t, J = 5.0 Hz, 2H), 3.32 (s, 3H), 3.25-2.70 (m, 3H), 2.05-1.50(m, 4H); 1 F NMR
(CDCI3) -57.54 (s, 3F), -75.39 (s, 3F), - 119.31 (s, IF), -134.96 (d, J = 11.3 Hz, IF); MS 608
(M+l, 100%).
Step I :Preparation of [4-(5-Aminomethyl-2-fluoro-phenyl)-piperidin-l-yl]-[7-fluoro-l-
(2-methoxy-ethyl)-4-trifluoromethoxy-l H-indol-3-yl]-methanone hydrochloride salt (10)
To a mixture of 9 (36 g, 59.3 mmol) in MeOH (400 mL) is added aqueous K2CO3
(65.5 g, 474 mmol, dissolved in 120 mL H20). This mixture is stirred at rt overnight. LC/MS
indicates the reaction is completed. The reaction mixture is concentrated in vacuo to remove
most of the methanol. The residue is partitioned between H20 and EtOAc. The two layers are
separated, and the organic layer is washed with H20 and brine, dried over MgSC^, filtered,
and concentrated in vacuo to yield 27.5 g (90%) of 10 as a clear colorless sticky gum.
1H NMR (CDCI3) 7.42 (s, 1H), 7.25-7.10 (m, 2H), 7.05-6.85 (m, 3H), 4.92 (br s, 1H), 4.46
(t, J =5.2 Hz, 2H), 3.86 (br s, 3 H), 3.74 (t, J = 5.1 Hz, 2H), 3.32 (s, 3H), 3.30-2.75 (m, 3H),
2.24 (br s, 2H), 2.05-1.55 (m, 4H); 1 F NMR (CDC13) -57.52 (s, 3F), -121.64 (s, IF), -136.03
(d, J = 11.3 Hz, IF); MS 512 (M+1, 100%).
To a solution of the above material (2.856 g, 5.59 mmol) in Et20 (30 mL) is added 2 N
HCl/Et 20 (3 mL, 6 mmol) dropwise. A solid precipitate forms and the ethereal solution is
decanted off. The solid is washed with additional Et20 then decanted off. The remaining pale
yellow solid is dissolved in warm MeOH (10 mL) then Et20 (50 mL) is added until the
solution is slightly cloudy. After ca. 2 hrs solid precipitate appears. Additional Et20 (5-10
mL) is added and then the suspension is placed in the fridge overnight. A white crystalline
product (2.475 g, 4.52 mmol) is collected and dried under high vacuum for 4 hrs.
1H NMR (DMSO-de) 8.32 (br s, 2H), 7.71 (s, 1H), 7.43 (d, 1H, J = 7.2 Hz), 7.36 (m, 1H),
7.26-7.20 (m, 1H), 7.12-7.08 (m, 2H), 4.49 (t, J = 5.1Hz, 2H), 4.00 (s, 2H), 3.71 (t, J = 5.1Hz,
2H), 3.32 (s, 3H), 3.21-3.07 (m, 3H), 2.99 (br s, 2H), 1.80-1.62 (m, 4H); 1 F NMR (DMSOd
) -56.79 (s, 3F), - 119.34 (s, IF), -134.53 (d, J = 9.6 Hz, IF); MS 512 (M+l, 100%). CHN:
Theoretical: C 53.06%, H 5.16%, N 7.42% (calc'd as 1.0 H20). Found: C 53.03%, H 4.82%,
N 7.22, CI 6.64%.
[4-(5-Aminomethyl-2-fluorophenyl)piperidine-l-yl][7-fluoro-l-(2-methoxyethyl)-4-
trifluoromethoxy-l H -indol-3-yl]methanone Benzoate (10 benzoate salt).
A 20-L glass-jacketed reactor already containing a toluene solution assumed to contain [4-(5-
aminomethy l-2-fluorophenyl)piperidine- 1-yl] [7-fluoro- 1-(2-methoxyethyl)-4-
trifluoromethoxy-l H-indol-3-yl]methanone (1320 g, 2.58 mol) is stirred and heated to 6 1 °C.
Benzoic acid (316 g, 2.58 mol) is added and, after all the benzoic acid has dissolved,
cyclohexane (6.04 L) is added. The reaction is heated to 77 °C where it is seeded with [4-(5-
aminomethy l-2-fluorophenyl)piperidine- 1-yl] [7-fluoro- 1-(2-methoxyethyl)-4-
trifluoromethoxy-l H-indol-3-yl]methanone benzoate (0.100 g) from a preceding batch. The
crystallization progresses at 77 °C and after 15 min, the reaction is cooled at a ramp of -10
°C/h. When the reaction reaches 6 1 °C, both the stirring and the cooling are stopped and the
reaction is allowed to cool to rt. After standing overnight, stirring is resumed and the product
is collected by filtration. The filter cake is washed with a solvent mixture prepared from
toluene (3 L) and cyclohexane (1. 5 L). After drying partially by suction, the product is
transferred to a drying oven where it is dried at 40 °C affording [4-(5-aminomethyl-2-
fluorophenyl)piperidine- 1-yl] [7-fluoro- 1-(2-methoxyethyl)-4-trifluoromethoxy- lH-indol-3 -
yl]methanone benzoate as a colorless solid: 1408.8 g (86%), mp = 156-159 °C. Elemental
analysis: Calculated for C25H2 F 5N303.C7H 0 2: C, 60.66; H, 5.09; N, 6.63. Found: C, 60.44;
H, 5.01; N, 6.87. Infrared spectral features (cm-1): 1612, 1526, 151 1, 1501, 1394, 1362,
1256, 1232, 121 1, 1158, 1117, 999, 826.
Scheme 2
rOH
3-Bromo-4-fluorobenzylamine hydrochloride (Wychem) is reacted with pyridine-4-
boronic acid (Clariant or Boron Molecular) in an alcoholic solvent with a boiling point of at
least that of isopropyl alcohol, such as n-propyl alcohol, n-butyl alcohol and the like; polar
aprotic solvent such as dimethylformamide, l-methyl-2-pyrrolidone, dimethylsulfoxide, and
the like etheral solvent such as 2-methyltetrahydrofuran, dimethoxyethane, and the like.
Compound 12 and compound 13 in mixture of any of the above mentioned solvents and water
in the presence of a suitable catalyst such as 1,1 '-bis(diphenylphosphino)ferrocenepalladium(
II)dichloride dichloromethane complex (PdCl2dppf-CH2Cl2), Pd(PPh3)4,
PdCl2(PPh3)2, Pd(dtbpf)Cl2, and the like with sufficient heating from about 70 °C to the
temperature of the boiling point of the Suzuki coupling reaction mixture provides the pyridine.
This pyridine is converted to the trifluoroacetamide compound 2,2,2-trifluoro-N-(4-
fluoro-3-pyridin-4-yl-benzyl)-acetamide hydrochloride under trifluoroacetylating conditions
using a suitable tirfluoroacetylating agent such as trifluoroacetic anhydride, trifluoroacetyl
fluoride, pentafluorophenyl trifluoroacetate and the like, in a trifluoroacetylating solvent such
as an ester solvent such as ethyl acetate, isopropyl acetate, or the like; an aromatic
hydrocarbon solvent such as toluene, or the like; a chlorinated hydrocarbon solvent such as
methylene chloride, 1,2-dichloroethane, or the like, at a trifiuoroacetylation reaction
temperature of about -20 to about 30 °C, followed by treatment with hydrochloric acid.
2,2,2-Trifluoro -N-(4-fluoro-3-pyridin-4-yl-benzyl)-acetamide hydrochloride is reduced
to under hydrogenation conditions to compound 14 by treatment with hydrogen in the
presence of a hydrogenation catalyst means Pt0 2, Pd/C, Pd(OH)2, Rh/C and the like, with or
without added inorganic acid such as HCl and the like, or organic acid such as acetic acid and
the like, in a hydrogenation reaction solvent such as an alcohol solvent such as ethanol,
isopropyl alcohol and the like; or acetic acid; or a mixture of an alcohol solvent or acetic acid
and water, at hydrogenation reaction temperature of from about 10 to about 60 °C, and
hydrogenation pressure of from about 20 to about 1000 psi.
The compound of the present invention is basic, and such compound is useful in the
form of the free base or in the form of a pharmaceutically acceptable acid addition salt thereof.
Acid addition salts may be a more convenient form for use; and in practice, use of the
salt form inherently amounts to use of the free base form. The acids which can be used to
prepare the acid addition salts include preferably those which produce, when combined with
the free base, pharmaceutically acceptable salts, that is, salts whose anions are non-toxic to the
patient in pharmaceutical doses of the salts, so that the beneficial inhibitory effects inherent in
the free base are not vitiated by side effects ascribable to the anions. Although
pharmaceutically acceptable salts of said basic compound is preferred, all acid addition salts
are useful as sources of the free base form even if the particular salt, per se, is desired only as
an intermediate product as, for example, when the salt is formed only for purposes of
purification, and identification, or when it is used as intermediate in preparing a
pharmaceutically acceptable salt by ion exchange procedures. Pharmaceutically acceptable
salts within the scope of the invention include those derived from mineral acids and organic
acids, and include hydrohalides, e.g. hydrochloride and hydrobromide, sulfates, phosphates,
nitrates, sulfamates, acetates, citrates, lactates, tartrates, malonates, oxalates, salicylates,
propionates, succinates, fumarates, maleates, methylene-bis-b- hydroxynaphthoates,
benzoates, tosylates, gentisates, isethionates, di-p-toluoyltartrates, methanesulfonates,
ethanesulfonates, benzenesulfonates, p-toluenesulfonates, cyclohexylsulfamates and quinates.
A more particular salt is salt of the compound of formula I is the hydrochloride salt. Another
particular salt of the present invention is the fumarate of the compound of formula I . A
preferred pharmaceutically acceptable salt of the present invention is the benzoate of the
compound of formula I .
As well as being useful in itself as an active compound, salts of the compound of the
invention are useful for the purposes of purification of the compound, for example by
exploitation of the solubility differences between the salts and the parent compound, side
products and/or starting materials by techniques well known to those skilled in the art.
According to a further feature of the invention, the acid addition salt of the compound
of this invention may be prepared by reaction of the free base with the appropriate acid, by the
application or adaptation of known methods. For example, the acid addition salts of the
compound of this invention may be prepared either by dissolving the free base in water or
aqueous alcohol solution or other suitable solvents containing the appropriate acid and
isolating the salt by evaporating the solution, or by reacting the free base and acid in an
organic solvent, in which case the salt separates directly or can be obtained by concentration
of the solution.
The acid addition salts of the compound of this invention can be regenerated from the
salts by the application or adaptation of known methods. For example, the parent compound
of the invention can be regenerated from their acid addition salts by treatment with an alkali,
e.g. aqueous sodium bicarbonate solution or aqueous ammonia solution.
In particular, the monobenzoate of Compound A is preferred.
The starting materials and intermediates may be prepared by the application or
adaptation of known methods, for example methods as described in the Reference Examples
or their obvious chemical equivalents.
The present invention is also directed to some intermediates in the above scheme 1
and, as such, the processes described herein for their preparation constitute further features of
the present invention.
List of Abbreviations
As used above, and throughout the description of the invention, the following
abbreviations, unless otherwise indicated, shall be understood to have the following meaning
ACN acetonitrile
AIBN 2,2'-azobisisobutyronitrile
bid twice daily
BOC or Boc tert-butyl carbamate
BOP benzotriazol-l-yl-oxytris (dimethylamino) phosphonium
n-Bu3SnH tri-n-butyltin hydride
t-Bu tert-butyl
Cbz benzyl carbamate
PTC phase transfer catalyst
DAST (diethylamino) sulfur trifiuoride (Et NSF3 )
DCC dicyclohexylcarbodiimide
DCM dichloromethane (CH Cl2)
DIC 1,3-diisopropylcarbodiimide
DIPEA diisopropylethylamine
DMAP 4-(N,N-dimethylamino)pyridine
DMP reagent Dess-Martin Periodinane reagent
DMF dimethylformamide
DMSO dimethylsulfoxide
EA elemental analysis
EDCI l-ethyl-3-(3-dimethylaminopropyl) carbodiimide HCl
eq equivalent(s)
Et ethyl
Et20 diethyl ether
EtOH ethanol
EtOAc ethyl acetate
FMOC 9-fluorenylmethoxycarbonyl
HOAt 1-hydroxy-7-azabensotriazole
HOBT 1-hydroxybenztriazole
HOSu N-hydroxysuccinamide
HPLC high performance liquid chromatography
LAH lithium aluminum anhydride
Me methyl
Mel methyliodide
MeOH methanol
MeOC(O) methyl chloroformate
MOMCI methoxymethylchloride
MOM methoxymethyl
MS mass spectroscopy
NaBH4 sodium borohydride
a C4H40 sodium tartrate
NMR nuclear magnetic resonance
P Polymer bond
PO per oral administration
PyBOP benzotriazole- 1-yl-oxytris-pyrrolidino-phosphonium
hexafluorophosphate
TBD 1,5,7-triazabicyclo[4 .4 .0]-dec-5-ene
RP-HPLC reverse phase-high pressure liquid chromatography
TBSCI t rt-butyldimethylsilyl chloride
TCA trichloroacetic acid
TFA trifluoroacetic acid
T 0 triflate anhydride
THF tetrahydrofuran
THP tetrahydropyran
TLC thin layer chromatography
Definitions
As used above, and throughout the description of the invention, the following terms,
unless otherwise indicated, shall be understood to have the following meanings:
"Acid bioisostere" means a group which has chemical and physical similarities
producing broadly similar biological properties to a carboxy group (see Lipinski, Annual
Reports in Medicinal Chemistry, "Bioisosterism In Drug Design" 21, 283 (1986); Yun,
Hwahak Sekye, "Application of Bioisosterism To New Drug Design" 33, 576-579, (1933);
Zhao, Huaxue Tongbao, "Bioisosteric Replacement And Development Of Lead Compounds
In Drug Design" 34-38, (1995); Graham, Theochem, "Theoretical Studies Applied To Drug
Design ab initio Electronic Distributions In Bioisosteres" 343, 105-109, (1995)). Exemplary
acid bioisosteres include -C(0)-NHOH, -C(0)-CH20H, -C(0)-CH2SH, -C(0)-NH-CN, sulfo,
phosphono, alkylsulfonylcarbamoyl, tetrazolyl, arylsulfonylcarbamoyl, N-methoxycarbamoyl,
heteroarylsulfonylcarbamoyl, 3-hydroxy-3-cyclobutene- 1,2-dione, 3,5-dioxo- 1,2,4-
oxadiazolidinyl or hydroxyheteroaryl such as 3-hydroxyisoxazolyl, 3-frydoxy- 1-
methylpyrazolyl and the like.
"Effective amount" is means an amount of a compound/composition according to the
present invention effective in producing the desired therapeutic effect.
"Hydrate" means a solvate wherein the solvent molecule s) is/are ¾ ) .
"Patient" includes both human and other mammals.
"Pharmaceutically acceptable ester" refers to esters that hydrolyze in vivo and include
those that break down readily in the human body to leave the parent compound or a salt
thereof, Suitable ester groups include, for example, those derived from pharmaceutically
acceptable aliphatic carboxylic acids, particularly alkanoic, alkenoic, cycloalkanoic and
alkanedioic acids, in which each alkyl or alkenyl moiety advantageously has not more than 6
carbon atoms. Exemplary esters include formates, acetates, propionates, butyrates, acrylates,
ethylsuccinates, and the like.
"Pharmaceutically acceptable prodrugs" as used herein refers to those prodrugs of the
compounds of the present invention which are, within the scope of sound medical judgment,
suitable for use in contact with the tissues of patients with undue toxicity, irritation, allergic
response, and the like, commensurate with a reasonable benefit/risk ratio, and effective for
their intended use of the compounds of the invention. The term "prodrug" refers to
compounds that are rapidly transformed in vivo to yield the parent compound of the above
formula, for example by hydrolysis in blood. Functional groups that may be rapidly
transformed, by metabolic cleavage, in vivo form a class of groups reactive with the carboxyl
group of the compounds of this invention. They include, but are not limited to such groups as
alkanoyl (such as acetyl, propanoyl, butanoyl, and the like), unsubstituted and substituted
aroyl (such as benzoyl and substituted benzoyl), alkoxycarbonyl (such as ethoxycarbonyl),
trialkylsilyl (such as trimethyl- and triethysilyl), monoesters formed with dicarboxylic acids
(such as succinyl), and the like. Because of the ease with which the metabolically cleavable
groups of the compounds of this invention are cleaved in vivo, the compounds bearing such
groups act as pro-drugs. The compounds bearing the metabolically cleavable groups have the
advantage that they may exhibit improved bioavailability as a result of enhanced solubility
and/or rate of absorption conferred upon the parent compound by virtue of the presence of the
metabolically cleavable group. A thorough discussion is provided in Design of Prodrugs, H.
Bundgaard, ed., Elsevier (1985); Methods in Enzymology; K. Widder et al, Ed., Academic
Press, 42, 309-396 (1985); A Textbook of Drug Design and Development, Krogsgaard-Larsen
and H. Bandaged, ed., Chapter 5; "Design and Applications of Prodrugs" 113-191 (1991);
Advanced Drug Delivery Reviews, H. Bundgard, 8 , 1-38, (1992); J . Pharm. Sci., 77.,285
(1988); Chem. Pharm. Bull, N. Nakeya et al, 32, 692 (1984); Pro-drugs as Novel Delivery
Systems, T. Higuchi and V. Stella, 14 A.C.S. Symposium Series, and Bioreversible Carriers
in Drug Design, E.B. Roche, ed., American Pharmaceutical Association and Pergamon Press,
1987, which are incorporated herein by reference.
"Pharmaceutically acceptable salts" refers to the relatively non-toxic, inorganic and
organic acid addition salts, and base addition salts, of compounds of the present invention.
These: salts can be prepared in situ during the final isolation and purification of the
compounds. In particular, acid addition salts can be prepared by separately reacting the
purified compound in its free base form with a suitable organic or inorganic acid and isolating
the salt thus formed. Exemplary acid addition salts include the hydrobromide, hydrochloride,
sulfate, bisulfate, phosphate, nitrate, acetate, oxalate, valerate, oleate, palmitate, stearate,
laurate, borate, benzoate, lactate, phosphate, tosylate, citrate, maleate, fumarate, succinate,
tartrate, naphthylate, mesylate, glucoheptonate, lactiobionate, sulfamates, malonates,
salicylates, propionates, methylene-bis-B-hydroxynaphthoates, gentisates, isethionates, di-ptoluoyltartrates,
methanesulfonates, ethanesulfonates, benzenesulfonates, p-toluenesulfonates,
cyclohexylsulfamates and laurylsulfonate salts, and the like. See, for example S.M. Berge, et
al., "Pharmaceutical Salts," J . Pharm. Sci., 66, 1-19 (1977) which is incorporated herein by
reference. Base addition salts can also be prepared by separately reacting the purified
compound in its acid form with a suitable organic or inorganic base and isolating the salt thus
formed. Base addition salts include pharmaceutically acceptable metal and amine salts.
Suitable metal salts include the sodium, potassium, calcium, barium, zinc, magnesium, and
aluminum salts. The sodium and potassium salts are preferred. Suitable inorganic base
addition salts are prepared from metal bases which include sodium hydride, sodium
hydroxide, potassium hydroxide, calcium hydroxide, aluminum hydroxide, lithium hydroxide,
magnesium hydroxide, zinc hydroxide and the like. Suitable amine base addition salts are
prepared from amines which have sufficient basicity to form a stable salt, and preferably
include those amines which are frequently used in medicinal chemistry because of their low
toxicity and acceptability for medical use. ammonia, ethylenediamine, N-methyl-glucamine,
lysine, arginine, ornithine, choline, ,'- dibenzylethylenediamine, chloroprocaine,
diethanolamine, procaine, N-benzylphenethylamine, diethylamine, piperazine,
tris(hydroxymethyl)-aminomethane, tetramethylammonium hydroxide, triethylamine,
dibenzylamine, ephenamine, dehydroabietylamine, N-ethylpiperidine, benzylamine,
tetramethylammonium, tetraethylammonium, methylamine, dimethylamine, trimethylamine,
ethylamine, basic amino acids, e.g., lysine and arginine, and dicyclohexylamine, and the like.
"Solvate" means a physical association of a compound of this invention with one or
more solvent molecules. This physical association includes hydrogen bonding. In certain
instances the solvate will be capable of isolation, for example when one or more solvent
molecules are incorporated in the crystal lattice of the crystalline solid. "Solvate"
encompasses both solution-phase and isolable solvates. Exemplary solvates include hydrates,
ethanolates, methanolates, and the like.
"Treating" and "Treatment" mean administration of a compound to either ameliorate a
disease condition or disorder, or prevent a disease condition or disorder. Or, the slowing of the
progression of the disease condition or disorder. And these also refer to reducing susceptibility
to a disease condition or disorder. The terms also include but are not limited to palliative
therapy that is non-curative.
EMBODIMENTS
With reference to inventions described herein, below are particular embodiments
related thereto.
A particular embodiment of the invention is a method of treating a dermatological
allergic condition, such as atopic dermatitis, comprising: administering to a patient in need
thereof an effective amount of a compound of Formula I or a corresponding N-oxide, prodrug,
pharmaceutically acceptable salt or solvate thereof.
Another particular embodiment of the invention is a pharmaceutical composition for
treating a dermatological allergic condition, such as atopic dermatitis, comprising a compound
of formula I, or a corresponding N-oxide, prodrug, pharmaceutically acceptable salt or salt
thereof, in combination with a pharmaceutically acceptable excipient. .
Yet another embodiment of the invention is a method of treating a dermatological
allergic condition, such as atopic dermatitis, comprising: administering to a patient in need
thereof an effective amount of a compound which is a beta-tryptase inhibitor.
The compounds of the invention optionally are supplied as salts. Those salts that are
pharmaceutically acceptable are of particular interest since they are useful in administering the
foregoing compounds for medical purposes. Salts that are not pharmaceutically acceptable are
useful in manufacturing processes, for isolation and purification purposes, and in some
instances, for use in separating stereoisomeric forms of the compounds of this invention. The
latter is particularly true of amine salts prepared from optically active amines.
Where the compound of the invention contains a carboxy group, or a sufficiently
acidic bioisostere, base addition salts may be formed and are simply a more convenient form
of use; and in practice, use of the salt form inherently amounts to use of the free acid form.
Also, where the compound of the invention contains a basic group, or a sufficiently
basic bioisostere, acid addition salts may be formed and are simply a more convenient form
for use; and in practice, use of the salt form inherently amounts to use of the free base form.
Another object of the present invention is to provide a pharmaceutical composition
comprising, a pharmaceutically effective amount of a compound of formula 1 and
pharmaceutically acceptable carrier or diluent.
It is another object of the invention to provide a pharmaceutical composition which is
effective, in and of itself, for utilization in a beneficial combination therapy because it
includes a plurality of active ingredients which may be utilized in accordance with the
invention.
The invention also provides kits or single packages combining two or more active
ingredients useful in treating or preventing macular degeneration in a patient. A kit may
provide (alone or in combination with a pharmaceutically acceptable diluent or carrier), the
compound of formula 1 and the additional active ingredient (alone or in combination with
diluent or carrier).
Compounds of formula I may be prepared by the application or adaptation of known
methods as used heretofore or described in the literature, or by methods disclosed herein.
The amount of the compound of Formula I in any of the foregoing applications can be
a pharmaceutically effective amount, a suboptimal effective amount, or combinations thereof,
so long as the final combination of ingredients comprises a pharmaceutically effective amount
of compounds that is effective in treating or preventing macular degeneration in a patient.
PHARMACOLOGY
Compounds according to the invention as described herein as being useful for being
able to inhibit beta-tryptase, and are also useful for treating inflammatory bowel disease.
A particular aspect of the invention provides for a compound according to the
invention to be administered in the form of a pharmaceutical composition, though the
compound may be administered alone. "Pharmaceutical composition" means a composition
comprising a compound of formula 1 and at least one component selected from the group
comprising pharmaceutically acceptable carriers, diluents, coatings, adjuvants, excipients, or
vehicles, such as preserving agents, fillers, disintegrating agents, wetting agents, emulsifying
agents, emulsion stabilizing agents, suspending agents, isotonic agents, sweetening agents,
flavoring agents, perfuming agents, coloring agents, antibacterial agents, antifungal agents,
other therapeutic agents, lubricating agents, adsorption delaying or promoting agents, and
dispensing agents, depending on the nature of the mode of administration and dosage ,forms.
The compositions may be presented in the form of tablets, pills, granules, powders, aqueous
solutions or suspensions, injectable solutions, elixirs or syrups. Exemplary suspending agents
include ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters,
microcrystalline cellulose, aluminum metahydroxide, bentonite, agar-agar and tragacanth, or
mixtures of these substances. Exemplary antibacterial and antifungal agents for the
prevention of the action of microorganisms include parabens, chlorobutanol, phenol, sorbic
acid, and the like. Exemplary isotonic agents include sugars, sodium chloride and the like.
Exemplary adsorption delaying agents to prolong absorption include aluminum monostearate
and gelatin. Exemplary adsorption promoting agents to enhance absorption include dimethyl
sulfoxide and related analogs. Exemplary carriers, diluents, solvents, vehicles, solubilizing
agents, emulsifiers and emulsion stabilizers, include water, chloroform, sucrose, ethanol,
isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, tetrahydrofurfuryl alcohol,
benzyl benzoate, polyols, propylene glycol, 1,3-butylene glycol, glycerol, polyethylene
glycols, dimethylformamide, Tween® 60, Span® 60, cetostearyl alcohol, myristyl alcohol,
glyceryl mono-stearate and sodium lauryl sulfate, fatty acid esters of sorbitan, vegetable oils
(such as cottonseed oil, groundnut oil, com germ oil, olive oil, castor oil and sesame oil) and
injectable organic esters such as ethyl oleate, and the like, or suitable mixtures of these
substances. Exemplary excipients include lactose, milk sugar, sodium citrate, calcium
carbonate, dicalcium phosphate. Exemplary disintegrating agents include starch, alginic acids
and certain complex silicates. Exemplary lubricants include magnesium stearate, sodium
lauryl sulfate, talc, as well as high molecular weight polyethylene glycols.
Other therapeutic agents may be used in combination with a compound of the present
invention. Therapeutic agents used in combination with a compound of the present invention
may be administered separately, simultaneously or sequentially. The choice of material in the
pharmaceutical composition other than the compound of formula 1 is generally determined in
accordance with the chemical properties of the active compound such as solubility, the
particular mode of administration and the provisions to be observed in pharmaceutical
practice. For example, excipients such as lactose, sodium citrate, calcium carbonate,
dicalcium phosphate and disintegrating agents such as starch, alginic acids and certain
complex silicates combined with lubricants such as magnesium stearate, sodium lauryl sulfate
and talc may be used for preparing tablets.
The pharmaceutical compositions may be presented in assorted forms such as tablets,
pills, granules, powders, aqueous solutions or suspensions, injectable solutions, elixirs or
syrups.
"Liquid dosage form" means the dose of the active compound to be administered to the
patient is in liquid form, for, example, pharmaceutically acceptable emulsions, solutions,
suspensions, syrups and elixirs. In addition to the active compounds, the liquid dosage forms
may contain inert diluents commonly used in the art, such solvents, solubilizing agents and
emulsifiers.
Solid compositions may also be employed as fillers in soft and hard-filled gelatin
capsules using such excipients as lactose or milk sugar as well as high molecular weight
polyethylene glycols, and the like.
When aqueous suspensions are used they can contain emulsifying agents or agents
which facilitate suspension.
The oily phase of the emulsion pharmaceutical composition may be constituted from
known ingredients in a known manner. While the phase may comprise merely an emulsifier
(otherwise known as an emulgent), it desirably comprises a mixture of at least one emulsifier
with a fat or an oil or with both a fat and an oil. In a particular embodiment, a hydrophilic
emulsifier is included together with a lipophilic emulsifier that acts as a stabilizer. Together,
the emulsifier(s) with or without stabilizer(s) make up the emulsifying wax, and the way
together with the oil and fat make up the emulsifying ointment base which forms the oily
dispersed phase of the cream formulations.
If desired, the aqueous phase of the cream base may include, for example, a least 30%
w/w of a polyhydric alcohol, i.e. an alcohol having two or more hydroxyl groups such as
propylene glycol, butane 1,3-diol, mannitol, sorbitol, glycerol and polyethylene glycol
(including PEG 400) and mixtures thereof. The topical formulations may desirably include a
compound that enhances absorption or penetration of the active ingredient through the skin or
other affected areas.
The choice of suitable oils or fats for a formulation is based on achieving the desired
properties. Thus the cream should preferably be a non-greasy, non-staining and washable
product with suitable consistency to avoid leakage from tubes or other containers. Straight or
branched chain, mono- or dibasic alkyl esters such as di-isopropyl myristate, decyl oleate,
isopropyl palmitate, butyl stearate, 2-ethylhexyl palmitate or a blend of branched chain esters
known as Crodamol CAP may be used. These may be used alone or in combination
depending on the properties required. Alternatively, high melting point lipids such as white
soft paraffin and/or liquid paraffin or other mineral oils can be used.
In practice, a compound/pharmaceutical compositions of the present invention may be
administered in a suitable formulation to humans and animals by topical or systemic
administration, including oral, inhalational, rectal, nasal, buccal, sublingual, vaginal, colonic,
parenteral (including subcutaneous, intramuscular, intravenous, intradermal, intrathecal and
epidural), intracisternal and intraperitoneal. It will be appreciated that the preferred route may
vary with for example the condition of the recipient.
"Pharmaceutically acceptable dosage forms" refers to dosage forms of the compound
of the invention, and includes, for example, tablets, dragees, powders, elixirs, syrups, liquid
preparations, including suspensions, sprays, inhalants tablets, lozenges, emulsions, solutions,
granules, capsules and suppositories, as well as liquid preparations for injections, including
liposome preparations. Techniques and formulations generally may be found in Remington's
Pharmaceutical Sciences, Mack Publishing Co., Easton, PA, latest edition.
"Formulations suitable for oral administration" may be presented as discrete units such
as capsules, cachets or tablets each containing a predetermined amount of the active
ingredient; as a powder or granules; as solution or a suspension in an aqueous liquid or a nonaqueous
liquid; or as an oil-in-water liquid emulsion or a water-in-oil liquid emulsion. The
active ingredient may also be presented as a bolus, electuary or paste.
A tablet may be made by compression or molding, optionally with one or more
accessory ingredients. Compressed tables may be prepared by compressing in a suitable
machine the active ingredient in a free-flowing form such as a powder or granules, optionally
mixed with a binder, lubricant, inert diluent, preservative, surface active or dispersing agent.
Molded tablets may be made by molding in a suitable machine a mixture of the powdered
compounds moistened with an inert liquid diluent. The tablets may optionally be coated or
scored and may be formulated so as to provide slow or controlled release of the active
ingredient therein.
Solid compositions for rectal administration include suppositories formulated in
accordance with known methods and containing at least one compound of the invention.
If desired, and for more effective distribution, the compounds can be
microencapsulated in, or attached to, a slow release or targeted delivery systems such as a
biocompatible, biodegradable polymer matrices (e.g., poly(d,l-lactide co-glycolide)),
liposomes, and microspheres and subcutaneously or intramuscularly injected by a technique
called subcutaneous or intramuscular depot to provide continuous slow release of the
compound(s) for a period of 2 weeks or longer. The compounds may be sterilized, for
example, by filtration through a bacteria retaining filter, or by incorporating sterilizing agents
in the form of sterile solid compositions which can be dissolved in sterile water, or some other
sterile injectable medium immediately before use.
"Formulations suitable for nasal or inhalational administration" means formulations
which are in a form suitable to be administered nasally or by inhalation to a patient. The
formulation may contain a carrier, in a powder form, having a particle size for example in the
range 1 to 500 microns (including particle sizes in a range between 20 and 500 microns in
increments of 5 microns such as 30 microns, 35 microns, etc.). Suitable formulations wherein
the carrier is a liquid, for administration as for example a nasal spray or as nasal drops, include
aqueous or oily solutions of the active ingredient. Formulations suitable for aerosol
administration may be prepared according to conventional methods and may be delivered with
other therapeutic agents. Inhalational therapy is readily administered by metered dose
inhalers.
"Formulations suitable for oral administration" means formulations which are in a
form suitable to be administered orally to a patient. The formulations may be presented as
discrete units such as capsules, cachets or tablets each containing a predetermined amount of
the active ingredient; as a powder or granules; as solution or a suspension in an aqueous liquid
or a non-aqueous liquid; or as an oil-in-water liquid emulsion or a water-in-oil liquid
emulsion. The active ingredient may also be presented as a bolus, electuary or paste.
"Formulations suitable for parenteral administration" means formulations that are in a
form suitable to be administered parenterally to a patient. The formulations are sterile and
include emulsions, suspensions, aqueous and non-aqueous injection solutions, which may
contain suspending agents and thickening agents and anti-oxidants, buffers, bacteriostats and
solutes which render the formulation isotonic, and have a suitably adjusted pH, with the blood
of the intended recipient.
"Formulations suitable for rectal or vaginal administrations" means formulations that
are in a form suitable to be administered rectally or vaginally to a patient. Suppositories are a
particular form for such formulations that can be prepared by mixing the compounds of this
invention with suitable non-irritating excipients or carriers such as cocoa butter, polyethylene
glycol or a suppository wax, which are solid at ordinary temperatures but liquid at body
temperature and therefore, melt in the rectum or vaginal cavity and release the active
component.
"Formulations suitable for systemic administration" means formulations that are in a
form 20 suitable to be administered systemically to a patient. The formulation is preferably
administered by injection, including transmuscular, intravenous, intraperitoneal, and
subcutaneous. For injection, the compounds of the invention are formulated in liquid
solutions, in particular in physiologically compatible buffers such as Hank's solution or
Ringer's solution. In addition, the compounds may be formulated in solid form and
redissolved or suspended immediately prior to use. Lyophilized forms are also included.
Systematic administration also can be by transmucosal or transdermal means, or the
compounds can be administered orally. For transmucosal or transdermal administration,
penetrants appropriate to the barrier to be permeated are used in the formulation. Such
penetrants are generally known in the art, and include, for example, bile salts and fusidic acid
derivatives for transmucosal administration. In addition, detergents may be used to facilitate
permeation. Transmucosal administration may be through use of nasal sprays, for example, or
suppositories. For oral administration, the compounds are formulated into conventional oral
administration forms such as capsules, tablets, and tonics.
"Formulations suitable for topical administration" means formulations that are in a
form suitable to be administered topically to a patient. The formulation may be presented as a
topical ointment, salves, powders, sprays and inhalants, gels (water or alcohol based), creams,
as is generally known in the art, or incorporated into a matrix base for application in a patch,
which would allow a controlled release of compound through the transdermal barrier. When
formulated in an ointment, the active ingredients may be employed with either a paraffmic or
a water-miscible ointment base. Alternatively, the active ingredients may be formulated in a
cream with an oil-in-water cream base. Formulations suitable for topical administration in the
eye include eye drops wherein the active ingredient is dissolved or suspended in a suitable
carrier, especially an aqueous solvent for the active ingredient. Formulations suitable for
topical administration in the mouth include lozenges comprising the active ingredient in a
flavored basis, usually sucrose and acacia or tragacanth; pastilles comprising the active
ingredient in an inert basis such as gelatin and glycerin, or sucrose and acacia; and
mouthwashes comprising the active ingredient in a suitable liquid carrier.
"Solid dosage form" means the dosage form of the compound of the invention is solid
form, for example capsules, tablets, pills, powders, dragees or granules. In such solid dosage
forms, the compound of the invention is admixed with at least one inert customary excipient
(or carrier) such as sodium citrate or dicalcium phosphate or (a) fillers or extenders, as for
example, starches, lactose, sucrose, glucose, mannitol and silicic acid, (b) binders, as for
example, carboxymethylcellulose, alginates, gelatin, polyvinylpyrrolidone, sucrose and acacia,
(c) humectants, as for example, glycerol, (d) disintegrating agents, as for example, agar-agar,
calcium carbonate, potato or tapioca starch, alginic acid, certain complex silicates and sodium
carbonate, (e) solution retarders, as for example paraffin, (f) absorption accelerators, as for
example, quaternary ammonium compounds, (g) wetting agents, as for example, cetyl alcohol
and glycerol monostearate, (h) adsorbents, as for example, kaolin and bentonite, (i) lubricants,
as for example, talc, calcium stearate, magnesium stearate, solid polyethylene glycols, sodium
lauryl sulfate, (j) opacifying agents, (k) buffering agents, and agents which release the
compound(s) of the invention 'in a certain part of the intestinal tract in a delayed manner.
Actual dosage levels of active ingredient(s) in the compositions of the invention may
be varied so as to obtain an amount of active ingredient(s) that is (are) effective to obtain a
desired therapeutic response for a particular composition and method of administration for a
patient. A selected dosage level for any particular patient therefore depends upon a variety of
factors including the desired therapeutic effect, on the route of administration, on the desired
duration of treatment, the etiology and severity of the disease, the patient's condition, weight,
sex, diet and age, the type and potency of each active ingredient, rates of absorption,
metabolism and/or excretion and other factors.
Total daily dose of the compounds of this invention administered to a patient in single
or divided doses may be in amounts, for example, of from about 0.001 to about 100 mg/kg
body weight daily and preferably 0.01 to 10 mg/kg/day. For example, in an adult, the doses
are generally from about 0.01 to about 100, preferably about 0.01 to about 10, mg/kg body
weight per day by inhalation, from about 0.01 to about 100, preferably 0.1 to 70, more
especially 0.5 to 10, mg/kg body weight per day by oral administration, and from about 0.01
to about 50, preferably 0.01 to 10, mg/kg body weight per day by intravenous administration.
The percentage of active ingredient in a composition may be varied, though it should
constitute a proportion such that a suitable dosage shall be obtained. Dosage unit
compositions may contain such amounts of such submultiples thereof as may be used to make
up the daily dose. Obviously, several unit dosage forms may be administered at about the
same time. A dosage may be administered as frequently as necessary in order to obtain the
desired therapeutic effect. Some patients may respond rapidly to a higher or lower dose and
may find much weaker maintenance doses adequate. For other patients, it may be necessary
to have long-term treatments at the rate of 1 to 4 doses per day, in accordance with the
physiological requirements of each particular patient. It goes without saying that, for other
patients, it will be necessary to prescribe not more than one or two doses per day.
The formulations can be prepared in unit dosage form by any of the methods well
known in the art of pharmacy. Such methods include the step of bringing into association the
active ingredient with the carrier that constitutes one or more accessory ingredients. In
general the formulations are prepared by uniformly and intimately bringing into association
the active ingredient with liquid carriers or finely divided solid carriers or both, and then, if
necessary, shaping the product.
The formulations may be presented in unit-dose or multi-dose containers, for example
sealed ampoules and vials with elastomeric stoppers, and may be stored in a freeze-dried
(lyophilized) condition requiring only the addition of the sterile liquid carrier, for example
water for injections, immediately prior to use. Extemporaneous injection solutions and
suspensions may be prepared from sterile powders, granules and tablets of the kind previously
described.
Compounds within the scope of the present invention exhibit marked pharmacological
activities according to tests described in the literature and below, which tests results are
believed to correlate to pharmacological activity in humans and other mammals.
The chemical reactions described in the references cited above are generally disclosed
in terms of their broadest application to the preparation of the compounds of this invention.
Occasionally, the reactions may not be applicable as described to each compound included
within the scope of compounds disclosed herein. The compounds for which this occurs will
be readily recognized by those skilled in the art. In all such cases, either the reactions can be
successfully performed by conventional modifications known to those skilled in the art, e.g.,
by appropriate protection of interfering groups, by changing to alternative conventional
reagents, by routine modification of reaction conditions, and the like, or other reactions
disclosed herein or otherwise conventional will be applicable to the preparation of the
corresponding compounds of this invention. In all preparative methods, all starting materials
are known or readily preparable from known starting materials.
The regimen for treating a patient suffering from a dermatological allergic condition,
such as atopic dermatitis, with the compound and/or compositions of the present invention is
selected in accordance with a variety of factors, including the age, weight, sex, diet, and
medical condition of the patient, the severity of the condition, the route of administration,
pharmacological considerations such as the activity, efficacy, pharmacokinetic, and
toxicology profiles of the particular compounds employed, and whether a drug delivery
system is utilized. Administration of the drug combinations disclosed herein should generally
be continued over a period until acceptable, indicating that has been controlled or eradicated.
Patients undergoing treatment with the drug combinations disclosed herein can be routinely
monitored by conventional methods of measuring kidney function to determine the
effectiveness of therapy. Continuous analysis of the data obtained by these methods permits
modification of the treatment regimen during therapy so that optimal amounts of each
component in the combination are administered, and so that the duration of treatment can be
determined as well. Thus, the treatment regimen/dosing schedule can be rationally modified
over the course of therapy so that the lowest amounts of each of the compounds used in
combination which together exhibit satisfactory effectiveness are administered, and so that
administration of such compounds in combination is continued only so long as is necessary to
successfully treat a dermatological allergic condition, such as atopic dermatitis.
EXPERIMENTAL EXAMPLE
Animal Information
The species used for this study were male, nonhuman primates, Macacafascicularis 5
to 10 years of age. Each animal was identified by a unique number tattoo located on its chest.
The group size was 12. Animals were supplied by Charles River and housed under conditions
outlined in the NIH Guide for Care and Use of Laboratory Animals in compliance with the
USDA Laboratory Animal Welfare Act, in a fully accredited AAALAC facility. Purina
(product 5038) primate chow was fed twice daily, supplemented with fruit, vegetables and
treats. Water was available ad libitum.
The animal use protocol that was followed for this study was approved by the
Institutional Animal Care and Use Committee.
Compound Information
Compound A initially referred to as the salt form (hydrochloride salt), was synthesized by the
scheme described above. Salt/Active Substance Ratio (w/w): 1.07.
Diphenhydramine hydrochloride (Bioniche Pharma, catalog number 1084899, lot
number 070709) was used as the positive control.
Formulations
Compound A formulated in a solution containing 0.22 mg/ml A sum(Ascaris sum) in
phosphate buffered saline was dosed at 0.004, 0.0004, 0.00004, and 0.000004 mg per injection
site at a volume of 40 ΐ .
Diphenhydramine hydrochloride was formulated in a solution containing 0.22 mg/ml A suum
in phosphate buffered saline. Diphenhydramine hydrochloride was dosed at 0.4 mg per
injection site at a volume of 40 ΐ .
Antigen Formulation
Ascaris suum extract (part number XPB33X1A5, lot 30575) was supplied by Greer
Laboratories. The extract was reconstituted with distilled water to a final concentration of 10
mg/ml of stock solution.
Procedure
Animals were anesthetized by an intramuscular (IM) injection of 5 to 10 mg/kg ketamine
mixed with 0.5 to 0.75 mg/kg metatomidine. The animal's chest and abdomen were shaved
and wiped clean with alcohol. The following injections (40 ΐ each) were given
intradermally:
PBS (phosphate buffered saline)
Ascaris 8.8 x 10 mg/ml
Ascaris 8.8 x 10 mg/ml + 0.4 mg Diphenhydramine hydrochloride
Ascaris 8.8 x 10 3 mg/ml + 0.004 mg SARI 607 19
Ascaris 8.8 x 10 3 mg/ml + 0.0004 mg SAR160719
Ascaris 8.8 x 10 3 mg/ml + 0.00004 mg SAR160719
Ascaris 8.8 x 10 3 mg/ml + 0.000004 mg SAR160719
The reactions in the form of a wheal were measured 15 minutes after injection using vernier
calipers. The wheal was measured along two diameters (Dl and D2) perpendicular to one
another. The area of the wheal was calculated using the formula:
Area (mm2) = ((Dl + D2)/4)2 x 3.142
Following the measurement, hydrocortisone cream was applied to all injection sites.
Diphenhydramine hydrochloride 2 mg/kg was administered (IM) as well as Atropine 0.1
mg/kg subcutaneously. The animals were reversed with atipamezole hydrochloride (IM),
recovered in their home cages and monitored for any further allergic reactions or itching at the
injection sites.
Statistical Analysis
Mixed model with repeated measures was used to analyze the data, with wheal size for
different treatment groups as the repeated measures, treatment as fixed effects, and animal as
random effect. The correlation structure was selected to be compound symmetry. Robust
covariance estimate was used to obtain the results.
Results
Compound A co-injected with A suum intradermally reduced antigen-induced wheal
formation when measured 15 minutes after injection. The mean wheal area (±SE) of the A
suum injection site was 119.626 ± 10.175 mm2. Compound A significantly reduced mean
wheal area at the 0.0004 mg (97.680 ± 8.012 mm2; p=0.0475) and 0.004 mg (102.390 ± 9.645
mm2; p=0.0171) doses. Diphenhydramine hydrochloride co-injected with A suum
significantly reduced mean wheal area at 0.4 mg (84.196 ± 7.364 mm2; p=0.0005).
The results are displayed in Table I below.
Table 1 - Individual calculated wheal area (mm2)
N/A=Not Applicable
The present invention may be embodied in other specific forms without departing from
the spirit or essential attributes thereof.
CLAIMS
What is claimed is:
1. A method of treating a dermatological allergic condition, comprising: administering to
a patient in need thereof an effective amount of a compound of Formula I :
Formula I
or a corresponding N-oxide, prodrug, pharmaceutically acceptable salt or solvate thereof.
2. A pharmaceutical composition for treating a dermatological allergic condition,
comprising a compound of formula I, or a corresponding N-oxide, prodrug, pharmaceutically
acceptable salt or salt thereof, in combination with a pharmaceutically acceptable excipient.
3. A method for the treatment of a human or non-human animal patient suffering from, or
subject to, a condition that can be ameliorated by the administration of a pharmaceutically
effective amount of a compound of formula I :
Formula I
4. The method according to claim 1, wherein the condition is an atopic skin disease,
selected from atopic dermatitis, eczema, psoriasis, chronic urticaria and alopecia.
5. The method according to claim 4, wherein the compound is administered as the
monobenzoate salt.