METHOD FOR TREATING ANXIETY
Extensive research has been conducted for a number cf
years directed toward the development of compounds capable of
treating anxiety in humans that are safer to the user and which
exhibit fewer side-effects. For example, several clinically
established anxiolytic agents such as the barbituates,
meprobamate and the benzodiazepines have numerous side effects
such as potential for abuse and addiction or potentiation of the
effects of ethanol. The mechanism of action of these compounds
is believed to involve the GABA/benzodiazepine receptor complex
in humans.
Buspirone is another compound which has been studied
for the treatment of anxiety. The literature states that
Buspirone interacts with reasonable potency only at the 5-HT21A
and dopamine receptors. Alfred Goodman, et al., Goodman and
Gilman's The Pharmacological Basis of Therapeutics, 8:482
(1990;; Tompkins et al. Research Communications in Psychology,
Psychiatry, and Behavior. 5:4, p. 338 (1980).
Sauerberg et al. in U.S. Patents 5,043,345, 5,041,455
and 5,260314 disclose the compounds employed in the present
invention as cholinergic compounds. As such, the compounds are
taught to be useful in treating Alzheimer's disease, severe
painful conditions, and glaucoma. There is no disclosure in the
patents of using the compounds to treat anxiety.
The art has reported that compounds which act as
agonists of the cholinergic muscarinic receptor can actually
produce anxiety. See, Risen et al. Psvchooharmacol. Bull., 19:
696-698 (1933i, Nurnberger et al. Psychiatry Res., 9:191-200
(1983), and Nurnberger et al. Psvchocharmacol. Bull., 17:80-82
(1982; .
Surprisingly, we have discovered that a group of
compounds having muscarinic cholinergic activity can be useful
for treating anxiety. The present invention relates to a method
of treating anxiety. More specifically, the invention provides
a method of treating anxiety in humans using a
tetrahydropyridine or azabicyclic oxadiazcle or thiadiazcle
compound. The activity of these compounds is believed to be
based on agonist action at the m-i muscarinic cholinergic
receptor. As noted hereinbefore, the compounds employed in the
method of the present invention are known. Methods of preparing
the compounds, as well as pharmaceutical formulations containing
the compounds, are taught by Sauerberg in U.S. Pat. Nos.
5,041,455, 5,043,345, and 5,260,314 herein incorporated by
reference in their entirety.
The present invention provides a method for treating
anxiety in humans comprising administering to a human in need
thereof, an antianxiety dose of a compound of the Formula I

wherein
X is oxygen or sulphur;
R is hydrogen, amino, halogen, -CHO, -NO2, -OR4, -SR4, -SOR4,
-SO2R4, C3_7-cycloalkyi, C4-3-(cycloalkylaikyl), -Z-C3-7-
cycloalkyl, and -Z-C4-3-(cycloalkylaikyl) wherein R4 is straight
or branched Ci-15-alkyl, straight or branched C2-i5~alkenyl,
straight or branched C2-i5-alkynyl, each of which is optionally
substituted with one or more halogens, -CF3, -CN, phenyl or
phenoxy wherein phenyl or phencxy is optionally substituted with
halogen, -CN, Ci-4-aikyl, Ci-4-alkoxy, -OCF3, -CONH2 or -CSNH2;
or R is phenyl or benzyioxycarbony!, each of which is optionally
substituted with halogen, -CN, Ci-4-alkyl, Ci-4-aikoxy, -OCF3,
-CCNK2 or -CSNH2; or R is -OR5Y, -SR5Y, -OR5ZY, -SR5ZY, -C-R4-Z-
R5 or -S-R4-Z-R5 wherein Z is oxygen or sulphur, R5 is straight
or branched Ci-15-alkynyl, and Y is a 5 or 6 membered
heterocyclic group containing one to four M, 0 or S atom is) or a
combination thereof, which heterocyclic group is optionally-
substituted at carbon or nitrogen atoi^(s) with straight or
branched Ci_6-alkyi, phenyl or benzyl, or which heterocyclic
group is optionally fused with a phenyl group; and G is selected
from one of the following azabicyclic rings

wherein the thiadiazole or oxadiazole ring can be attached at
any carbon atom of the azabicyclic ring; R1 and R2 may be
present at any position, including the point of attachment of
the thiadiazole or oxadiazole ring, and independently are
hydrogen, straight or branched Ci-c.-alkyl, straight or branched
C2-5 alkenyl, straight or branched C2-5-aikynyl, straight or
branched Ci_io-alkoxy, straight or branched Ci_5~alkyl
substituted with -OH, OR4, halogen, -NH2 or carboxy; R3 is H,
straight or branched Ci-5-alkyl, straight or branched C2-5-
alkenyl or straight or branched C2-5-aikynyi; n is 0, 1 or 2; m
is 0, 1 or 2; p is 0, 1 or 2; q is 1 or 2; and --- is a single
or double bond; or
a pharmaceutically acceptable salt thereof.
It is to be understood that the invention extends to
the use of each of the stereoisomeric forms of the compounds of
the present invention as well as the pure diastereomeric, pure
enantiomeric, and racemic forms of the named compounds.
The term "antianxiety dose", as used herein,
represents an amount of compound necessary to prevent or treat a
human susceptible to or suffering from anxiety following
administration to such human. The active compounds are
effective ever a wide dosage range. For example, dosages per
day will normally fall within the range of about 0.005 to about
500 mg/kg of body weight. In the treatment of adult humans, the
range of about 0.05 to about 100 mg/kg, in single or divided
doses, is preferred. However, it will be understood that the
amount of the compound actually administered will be determined
by a physician, in the light of the relevant circumstances
including the condition to be created, the choice of compound to
be administered, the age, weight, and response of the individual
patient, the severity of the patient's symptoms, and the chosen
route of administration, and therefore the above dosage ranges
are not intended to limit the scope of the invention in any way.
While the present compounds are preferably administered orally
to humans susceptible to or suffering from anxiety, the
compounds may also be administered by a variety of other routes
such as the transdermal, parenterally, subcutaneous, intranasal,
intramuscular and intravenous routes. Such formulations may be
designed to provide delayed or controlled release using
formulation techniques which are known in the art.
As used herein the term "treating" includes
prophylaxis of a physical and/'or mental condition or
amelioration or elimination cf the developed physical and/or
mental condition once it has been established or alleviation cf
the characteristic symptoms of such condition.
As used herein the terrr. "anxiety" refers to an anxiety
disorder. Examples of anxiety disorders -which may preferredly
be treated using an effective amount of a named compound cr
pharmaceutically acceptable salt thereof include, but are not
limited to: Panic Attack; Agoraphobia; Acute Stress Disorder;
Specific Phobia; Panic Disorder; Psychoactive Substance Anxiety-
Disorder; Organic Anxiety Disorder; Obsessive-Corr.pulsive Anxiety
Disorder; Posttraumatic Stress Disorder; Generalized Anxiety
Disorder; and Anxiety Disorder NOS.
Examples of anxiety disorders which may more
preferredly be treated using an effective amount of a named
compound or a pharmaceutically acceptable salt thereof include
Panic Attack; Panic Disorder; Psychoactive Substance Anxiety
Disorder; Organic Anxiety Disorder; Obsessive-Compulsive Anxiety
Disorder; Posttraumatic Stress Disorder; Generalized Anxiety
Disorder; and Anxiety Disorder NOS.
Examples of the anxiety disorders 'which are most
preferredly treated using a named compound include Organic
Anxiety Disorder; Obsessive-Compulsive Disorder; Posttraumatic
Stress Disorder; Generalized Anxiety Disorder; and Anxiety
Disorder NOS.
The named anxiety disorders have been characterized in
the DSM-IV-R. Diagnostic and Statistical Manual of Mental
Disorders, Revised, 4th Ed. (1994;. The DSM-IY-R was prepared
by the Task Force on Nomenclature and Statistics of the American
Psychiatric Association, and provides clear descriptions of
diagnostic catagories. The skilled artisan -will recognize that
there are alternative nomenclatures, nosologies, and
classification systems for pathologic psychological conditions
ana that these systems evolve with medical scientific progress.
The compounds employed in the invention are not
believed to act via the GABA/'ber-zcdiazepine, 5HT1A, or Dl
receptor systems in humans. Rather, the activity of the present
compounds as antianxiety agents is believed to be based upon
modulation of muscarinic cholinergic receptors. However, the
mechanism by which the present compounds function is not
necessarily the mechanism stated supra., and the present
invention is not limited by any mode of operation.
The following Examples are studies to establish the
usefulness of the named compounds for treating anxiety.
Example 1
Punished Responding
The antianxiety activity of the compounds employed in
the method of the present invention is established by
demonstrating that the compounds increase punished responding.
This procedure has been used to establish antianxiety activity
in clinically established compounds.
According to this procedure, the responding of rats or
pigeons is maintained by a multiple schedule of food
presentation. In one component of the schedule, responding
produces food pellet presentation only. In a second component,
responding produces both food pellet presentation and is also
punished by presentation of a brief electric shock. Each-
component of the multiple schedule is approximately 4 minutes in
duration, and the shock duration is approximately 0.3 seconds.
The shock intensity is adjusted for each individual animal so
that the rate of punished responding is approximately 15 to 3 0%
of the rate in the unpunished component of the multiple
schedule. Sessions are conducted each weekday and are
approximately 60 min in duration. Vehicle or a dose of compound
are administered 30 min to 6 hr before the start of the test
session by the subcutaneous or oral route. Compound effects for
each dose for each animal are calculated as a percent of the
vehicle control data for that animal. The data are expressed as
the mean +_ the standard error of the mean.
Example 2
Mcnkev Taming Model
Further, the antianxiety activity of the compounds is
established by demonstrating that the compounds are effective in
the monkey taming model. Plotnikoff Res. Comm. Chem. Path. &
Pharmacol., 5: 128-134 (1973) described the response of rhesus
monkeys to pole prodding as a method of evaluating the
antiaggressive activity of a test compound. In this method, the
antiaggressive activity of a compound was considered to be
indicative of its antianxiety activity. Hypoactivity and ataxia
were considered to be indicative of a sedative component of the
compound. The present study is designed to measure the pole
prod response-inhibition induced by a compound of this invention
in comparison with that of a standard antianxiety compound such
as diazepam as a measure of antiaggressive potential, and to
obtain an indication of the duration of action of the compound.
Male and female rhesus or cynomclogous monkeys,
selected for their aggressiveness toward a pole, are housed
individually in a primate colony room. Compounds or appropriate
vehicle are administered orally or subcutaneously and the
animals are observed by a trained observer at varying times
after drug administration. A minimum, of three days (usually a
week or more) elapses between treatments. Treatments are
assigned in random fashion except that no monkey receives the
same compound tv;c times consecutively.
Aggressiveness and motor impairment are graded by
response tc a pole being introduced into the cage as described
in Table 1. The individuals responsible for grading the
responses are unaware of the dose levels received by the
monkeys.
Example 3
Human Clinical Trials
Finally, the antianxiety activity of the named
compounds can be demonstrated by human clinical trials. The
study was designed as a dcubie-biir.d, parallel, placebc-
controlled multi-center trial. The patients were randomized ir-tc
four groups, placebo and 25, 50, and 75 mg tid of test compound.
The dosages were administered orally with food. Patients were
observed at four visits to provide baseline measurements.
Visits 5-3 3 served as the treatment phase for the study.
During the visits, patients and their caregivers were
questioned and observed for signs of agitation, mood swings,
vocal outbursts, suspiciousness, and tearfulness. Each of these
behaviors are indicative of the effect of the test compound on
an anxiety disorder.
For example, one test compound produced the following results:
Placebo 25 mg 50 mg 75 mg p-Value
(N=87) iK=85) (N=83) (N=87;
Treatment groups were compared with respect to the
number and percent of patients who ever had the symptom during
the double-blind portion of the study (visits 5 through 33), at
a severity that was worse than during the baseline visits (1
throucrh 4 ) .
Preferred compounds for use in treating anxiety
include:
3-CKLORO-3-(3-CHLORO-l,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[2.2.2]OCTANE;
3-(3-CHLORO-l,2,5-THIADIAZOL-4-Y1;-3-HYDROXY-l-
AZABICYCLO[2.2.2]OCTANE;
3-METHOXY-3-(3-METHOXY-l,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[2.2.2]OCTANE;
3-(3-METHOXY-l,2,5-THIADIAZCL-4-YD-1-AZABICYCLO[2.2.2]OCT-2-
ENE;
3-(3-HEXYL0XY-1,2,5-THIADIAZOL-4-YL)-1-AZABICYCLC[2.2.2]OCT-2-
ENE ;
3-HEXYLOXY-3-f3-HEXYLOXY-1,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO-
[2.2.2]OCTANE;
3-(3-HEXYLOXY-1,2,5-THIADIAZOL-4-YL)-3-HYDROXY-l-
AZABICYCLC[2.2.2]OCTANE;
3-(3-CHLORO-l,2,5-THIADIAZOL-4-YL)-1-AZA3ICYCL0[2.2.2]OCTANE;
3-(3-ETHOXY-l,2,5-TKIADIAZOL-4-YD-1-AZABICYCLO[2.2.2]OCTANE;
3 -(3 -PROPOXY-1,2,5-THIADIAZOL-4-YD -1-AZABICYCLO[2.2.2]OCTANE;
3-(3-BUTOXY-l,2,5-THIADIAZOL-4-YL;-1-AZABICYCLO[2.2.2jOCTANE;
3 -(3-PENTYLTHIO-1,2,5-THIADIAZOL-4 -YL)-1-AZABICYCLO-
[2.2.2]OCTANE;
3-(3-ETHOXY-l,2,5-THIADIAZOL-4-YD-1-AZABICYCLO[2.2.2]OCTANE;
3-(3-HEXYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO[2.2.2]OCTANE;
3-(3-(3-PHENYLPROPYLTHIO)-1,2, 5-THIADIAZOL-4-YL)-1-
AZABICYCLO[2.2.2]OCTANE;
3 -{3-HEXYLTHIO-1,2,5-THIADIAZOL-4 -YL}-1-AZABICYCLO[2.2.2]OCTANE;
3-(3-(4-CYANOBENZYLTHIO)-1,2,5-THIADIAZOL-4-YL;-1-
AZABICYCLO[2.2.2]OCTANE;
EXO-6-(3-CHLORO-l,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[3.2.1]OCTANE;
ENDO-6-(3-CHLORO-l,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[3.2.1]OCTANE;
EKDO-6-(3-HEXYLTHIO-1,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[3.2.1]OCTANE;
ENDO-6-(3-(5-HEXENYLTHIO)-1,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[3.2.1]OCTANE;
ENDO-6-(3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[3.2.1]OCTANE;
ENDO-6-(3-PENTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[3.2.1]OCTANE;
ENDO-6-(3-ETHYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[3.2.1]OCTANE;
ENDO-6-(3-(3-PHENYLPROPYLTHIO)-1,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO[3.2.1]OCTANE;

Endo-6-(3-(4-cyanobenzylthio'i-l.2,5-thiaaiazoi-4-yi)-1-azaDicycio[3.2.1]-
octane;
Exo-6-(3-ethoxy-l,2.5-thiaaiazoi-4-yi)-1-3zaDicycic[3.2. ^octane:
Endo-6-(3-ethoxy-1.2.5-thiadiazol-4-yl)-1 -azabicycio[3.2.1 ]octane;
Exo-3-(3-chloro-1.2.5-tniadiazoi-4-yl)-1-azabicycloi2.2.1]heptane;
Enao-3-(3-cnloro-1,2,5-thiadiazol-4-yl)-1 -azabicycici 2.2.1 ]heptane;
Er.dc-3-(3-methoxy-l.2.5-thiaaiazol-4-yl)-1-azabicyclo[2.2.1]hepiane:
Exo-6-(3-hexyithio-1,2,5-thiadiazol-4-yl)-1-azaDicyclo[3.2.1Joctane;
Exo-6-(3-butylthio-1,2,5-thiadiazol-4-yl)-1-azabicyclo[3.2.1]octane;
Exo-6-(3-pentylthio-l ,2.5-thiadiazol-4-yl)-1 -azabicyc!o[3.2.1 joctane;
Exo-6-(3-ethyithio-1,2,5-thiaaiazoi-4-yi)-1-azaDicyc:c[3.2.1]octane;
Enao-3-(3-pentylthio-l,2.5-thiadiazoi-4-yl)-1-azabicyclo[2.2.1]heptane:
Enac-3-(3-(3-phenylpropylthio)-1,2,5-thiadiazol-4-yl)-1 -azabicyclo[2.2.1 ]-
heptane;
Endo-3-(3-butylthio-l.2.5-thiadiazol-4-yl)-1-azabicyclc[2.2.1]heptane:
Endo-3-(3-propyithio-i .2,5-thiaaiazoi-4-yi)-l -azabicycio [2.2.1 ]heptane:
Exo-3-(3-pentylthio-i.2.5-thiaaiazoi-4-yl)-l-azaDicycio[2.2.1]heptane:

Exo-3-(3-hexyithio-1,2.5-thiadiazol-4-yi)-1 -azaDicycio[2.2.1 jheptane;
Exo-3-(3-propyithio-i ,2,5-thiaaiazoi-4-yi)-1 -azaDicyc:c[2.2.1 jheptane;
Exo-3-{3-(3-pnenyiprcGyithio)-1,2,5-thiadiazci-4-yi)-1 -azaoicycio [2.2.1 ]-
heptane;
Exo-3-(3-butylthio-l ,2,5-thiadiazoi-4-yl)-1 -azabicycio[2.2.1 Iheptane;
3-Chloro-2-(3-ethoxy-l,2,5-thiaaiazol-4-yl)-8-azabicycio[3.2.1]oct-2-ene;
3-(3-Hexyioxy-1,2.5-thiaaiazci-4-yl)-1-azabicyclo[2.2.2]octane:
3-(3-(6-Hexenyloxy)-1,2,5-thiadiazol-4-yl)-1-azabicycio[2.2.2]octane;
3-(3-(3-Hexenyloxy)-1,2,5-thiadiazol-4-yl)-1-azabicyclo[2.2.2]octane;
3-(3-Pentyloxy-1,2,5-thiadiazci-4-yl)-1-azabicyc!o[2.2.2]octane;
3-f3-lsoDentylaxy-l,2,5-thiaaiazoi-4-yl)-1-azaDicycio[2.2.2]octane;
3-(3-Ethyithio-1,2,5-thiadiazc!-4-yl)-1-azabicycio[2.2.2]cctane:
3-(3-PrcDylthio-1,2,5-thiadiazoi-4-yl)-1-azabicycio[2.2.2]octane;
3-(3-HeDtylthio-i,2,5-thiaaiazo!-4-yl)-1-azabicycio[2.2.2] octane;
Enco-6-(3-propylthio-l ,2,5-thiaaiazoi-4-yi)-1 -azabicyclo [3.2.1 jocta.ne;
Exc-6-i3-propyithio-i,2,5-thiaaiazci-4-yi)-";-azabicycicf3.2.":]cctane;
Enao-3-(3-hexyithic-l .2.5-thiaaiazoi-4-yi)-l -azaDicycio[2.2.1 jheDtane:

3-Ch!oro-2-(3-chloro-l.2.5-thiaaiazol-4-yl)-8-azabicycio[3.2.1]oct-2-ene;
Exo-6-(3-pentyicxy-1.2,5-thiaa;azoi-4-yi)-1-azabicyc!o[3.2.1]ocrane:
Endo-6-(3-pentyloxy-1,2.5-thiaaiazoi-4-yi)-1-azaDicycicf3.2.1]octane;
4-Chloro-3-(3-ch:oro-';,2.5-tniacJiazcl-4-yi)-1-azabicycior3.3.1]non-3-ene:
4-Ch!oro-3-(3-propyioxy-1,2.5-thiadiazoi-4-yl)-1-3zabicycio[3.3.1]non-3-ene;
4-Chioro-3-(3-pentyioxy-i.2,5-thiaaiazoi-4-yl)-Ji-3zabicycic[3.3.1]non-3-ene;
4-Chloro-3-(3-methoxy-!.2,5-thiadiazoi-4-yi)-1-azabicycio[3.3.1]non-3-ene;
4-Chloro-3-(1,2.5-thiadiazol-4-yl)-1-azabicycto[3.3.1]non-3-ene;
(-) 3-(3-Butylthio-1,2,5-thiadiazol-4-yl)-1 -azabicycio[2.2.2]octane;
(+) 3-(3-Butylthio-1,2,5-thiadiazol-4-yl)-1 -azab;cycio[2.2.2]octane:
3-(3-Amino-1l2l5-oxaaiazoi-4-vi)-l-azabicvciof2.2.2lcciane;
5-(3-Chloro-l.2,5-thiadiazoi-4-yl)-1-azabicycio[3.2.1]octane;
5-(3-Hexyithio-l ,2,5-thiaaiazoi-4-yl)-1 -azabicycio [3.2.1 ]octane;
(5S,6S)-6-(3-butyithio-1,2,5-thiaaiazoi-4-yl)-1 -azabicycio[3.2.1 1 octane;
(5R.6R)-6-(3-prcpyithio-1.2.5-thiaaiazci-4-yl)-1-3zaoicycio[3.2.1]octane;
(5S.6S)-6-(3-prcpyith:o-',i,2.5-thiadiazoi-4-yl)-1-azaoicycic[3.2.1]octane;

Exo-6-(3-butylsulfonyi-1,2,5-thiaaiazoi-4-yi)-1 -azabicycio [3.2.1 joctane;
Exc-6-(3-(212,3.3,4,4,4-heptaflucrccutyioxyj-l,2.5-thiadiazoi-4-yi)-1-azabi-
cycic [3.2.1] octane;
Exo-6-(3-methoxy-1.2,5-thiadiazoi-4-yl)-1-azabicycio[3.2.1 Joctane;
Exo-6-(3-ethoxy-1,2.5-thiaaiazoi-4-yl)-1 -azabicycio[3.2.1 ]octane;
Exo-6-(3-propoxy-1,2,5-thiadiazci-4-yl)-l -azabicycio[3.2.1 joctane;
Exo-6-(3-butoxy-1.2.5-thiadiazoi-4-yi)-1 -azabicycic[3.2.1 joctane;
Exo-6-(3-pentyloxy-1,2,5-thiadiazol-4-yl)-1-azadicyclo[3.2.1 joctane;
Exo-6-(3-hexyloxy-1,2,5-thiadiazol-4-yl)-1 -azabicycio [3.2.1 joctane;
Exo-6-(3-isohexyioxy-1,2.5-thiadiazol-4-yl)-1-azabicyclo[3.2.1 joctane;
Exo-6-i'3-(2-butYnyloxy)-1,2.5-thiaaiazci-4-yi)-1-azabicycio[3.2.1 joctane;
Exo-6-(3-(3-(2-thienyl)-1-propyithio)-1,2.5-thiaaiazoi-4-yl)-1-azabicycio[3.2.1j-
octane;
Enao-6-(3-(3-(2-thienyl)-1 -propyithio)-1,2,5-thiadiazol-4-yl)-1 -azabicycio-
[3.2.1 joctane;
Enao-6-(3-(4,4,4-trifluorcbutylthio:-1,2,5-thiaaiazci-4-yl)-1 -azabicycic[3.2.1 ]-
cctane;
Er!Cc-6-(3-(6,6,6-trifluoro--; -hexyithioi-1,2,5-thiadiazoi-4-yi)-1 -azabicycio-
[3.2.1 joctane;

(5S.6S)-6-(3-butyisuifonyl-1,2,5-thiadiazci-4-yl)-1-azabicycio[3.2.1]octane;
(5S.6S)-6-f3-(4,4,4-trifluoro-1-butylthioi-1,2,5-thiadiazoi-4-yl)-1-azabicyclo-
[3.2.1 joctane;
3-(1,2,5-Thiadiazoi-3-yl)-1 -azabicydo [2.2.2] octane;
Exo-3-(3-methyithio-l,2,5-thiaaiazol-4-yi)-1-azabicyclo[2.2.':] heptane;
Exo-3-(3-ethylthio-i ,2,5-thiaaiazci-4-yl)-1 -azabicyclo[2.2.1 jheptane;
Enao-3-(3-(2-phenoxye:hylthici-1,2,5-thiadiazci-4-yl)-1 -azabicycio [2.2.1 jhep-
tane;
Endo-3-(3-(2-thienyi)propylthio-1,2I5-thiadiazol-4-yl)-1-azabicyclo[2.2.1]-
heptane;
Endo-3-(3-(2-phenyithio)ethylthio-1,2,5-thiadiazoi-4-yl)-1-azabicycio[2.2.-
1 Jheptane;
Exo-6-(3-methyithio-l .2,5-thiaaiazoi-4-yi)-1 -azacicycio [3.2.1 ] octane;
Exo-6-(3-heptylthio-1.2.5-thiaaiazol-4-yi)-1 -azabicyc!c[3.2.1 joctane;
Exo-6-(3-isohexyithio-l ,2,5-thiadiazol-4-yi)-1 -azabicycio[3.2.1 joctane;
Exo-6-(3-isopentylthio-1,2,5-thiaaiazol-4-yl)-1-azabicycio[3.2.1 joctane;
Exo-6-(3-(4-cyanocuWithio)-l,2,5-th:adiazoi-4-yi)-1-azabicyc:o[3.2.1 joctane;
Exc-6-(3-cyanometnyithio-i.2,5-tr.!adiazc!-i-yi)-1-3zabicyc;o[3.2.1 joctane;

Exc-6-(3-(2-cyanoetnylthio)-1,2,5-thiaaiazoi-4-yi)-1 -azabicyclo [3.2.1 ]octane;
Exo-6-i 3-(3-cyancprcpyithic)-1,2.5-thiadiazoi-4-yl)-1-azabicycio[3.2.1 Joctane;
Exc-6-(3-(4-cyanobenzyithio)-1,2,5-thiaa;azoi-4-yi)-1-azabicycio[3.2.1]octane:
Exo-6-(3-(3-phenylpropyithio)-1.2,5-thiaa;azoi-4-yl)-1 -azabicycio [3.2.1 Joctane:
Exo-6-(3-(2-phenoxyethylthio)-1,2,5-thiaciiazci-4-yl)-1-azabicycio[3.2.1 jo-
ctane;
Exc-6-(3-benzyithio-1,2,5-thiadiazci-4-yi)-i -azabicycio [3.2.1: octane:
Endo-6-(3-(2-phenoxyethylthio)-1,2,5-thiadiazcl-4-yl)-1 -azabicycio [3.2.1 ]-
octane;
Endo-6-(3-methylthio-1,2,5-thiadiazol-4-yl)-1 -azabicyclo[3.2.1 ]octane;
Enco-6-(3-isopentylthio-1,2,5-thiad:azci-4-yi)-1 -azabicycic[3.2.1 JGCtane;
Enac-5-(3-isohexyithio-i ,2,5-thiaaiazol-4-yl)-1 -azabicycio [3.2.1 ]octane;
Enac-6-(3-benzylthio-1.2,5-thiadiazoi-4-yl)-1-azabicycio[3.2.1 joctane;
Enac-6-(3-cyanomethyithio-l,2,5-thiaaiazol-4-yi)-1-azabicycio[3.2.1 joctane;
Endc-6-f3-(2-cyanoethylthio)-1,2,5-thiadiazoi-4-yl)-1-azabicycio[3.2.1 Joctane;
Encc-6-(3-(3-cyanoprcpyithio)-1,2,5-thiaaiazoi-4-yi)-1 -azabicycio [3.2.1 j-
octane:
Encc-6-;'3-(4-cyanobutyithioi-1,2,5-thiaaiazoi---yl)-1-azabicycio[3.2.1 joctane:

4-Chioro-3-(3-butoxy-l ,2.5-thiadiazol-4-yl)-1 -azaDicycio[3.3.1 ]non-3-ene;
4-Ch!cro-3-(3-hexyioxy-1,2,5-thiaaiazoi-4-yi)-1-azabicyc:o[3.3.1 ]non-3-ene;
3-(3-Butoxy-1,2,5-thiadiazcl-4-yi)-1-azablcyclo(3,3,1)non-3-ene;
3-(3-Methoxy-1,2.5-thiaaiazol-4-yl)-1-azabicyclo[3.3.1 ]non-3-ene;
3-(3-Propoxy-1,2.5-thiaaiazoi-4-yi)-1-azabicyclo[3.3.1]non-3-ene;
3-(3-Hexyioxy-1 ,2,5-tr,iaaiazoi-4-yi)-1 -azabicyclo[ 3.3.1 ]non-3-ene:
3-(3-lsopenrylth:o-H, .2.5-thiaciazo!-4-yi)-1-azabicycio[2.2.23octane;
3-(3-(1 -Methylpropylthio)-1,2,5-thiadiazol-4-yl)-1 -azabicyclo [2.2.2] octane;
3-(3-Isobutyithio-1,2,5-thiadiazoi-4-yl)-1 -azabicyclo[2.2.2]octane;
3-(3-(2-Phenoxyethyithio)-1,2.5-thiaaiazci-4-yl)-1-azabicyclo[2.2.2]octane;
3-(3-Cyanomethylthio-i,2.5-thiadiazol-4-yl)-1-azaDicycic[2.2.2]octane;
3-(3-(3-(2-Thienyi)propy!thioi-1,2.5-thiadiazol-4-yl)-1-azabicycio[2.2.2]octane
3-(3-(4-Chlorobutyithio,)-i.2.5-thiadiazol-4-yl)-1-azabicyclo[2.2.2]octane;
3-(3-Methylthio-l.2.5-thiadiazci-4-yl)-1-azabicyclo[2.2.2]octane;
3-(3-(1-Methy!tetrazci-5-yithic;butylthic-i,2,5-thiaaiazol-4-yi)-1-azacicycio-
[2.2.2]ocrane;

3-(3-i2-Methyi-1.3,4-thiadiazci-5-ylthioibutylthio-1,2,5-thiadiazol-4-yi)-1-
azaD:cyc:o[2.2.2iCc;ane;
3-(3-(4-(2-Ber.zcthiazciyt)thioibuty'lthio-1,2,5-t'niaaiazoi-4-yi)-1-azabicycio-
[2.2.2] octane:
3-(3-';4-Eihyibenzy'.cxy)-',i,2,5-thiaaiazoi-4-yi)-1-azaDicyctcf2.2.2]octane;
3-(3-'3-(2-Thienyi)propoxy)-''. .2.5-thiaaiazci-4-yi)-1-azabicyc:o[2.2.2]octane;
:5R.6Ri-6-(3-buryitr,io-l ,2,5-th;aaiazo:-4-yi)-i -azaDicycioi'3.2.1 ] octane;
3-(3-(N-(2-Ethyithio;phthalimide)-1.2.5-thiaGiazci-4-yl)-1-azabicyclor2.2.2]-
octane;
3-(3-(2-Methoxyethylthio)-1,2,5-thiadiazo!-4-yl)-1-azabicycio[2.2.2]octane;
3-(3-(2-(l ,3-Dioxaian-2-yi)ethylthio)-1,2,5-thiaaiazoi-4-yl)-1 -azabicyc'.o [2.2.2]-
octane;
3-(3-{4-Pyricylmetnyithio;-1,2,5-thiaaiazci-4-yi)-1-azabicyc!c[2.2.2]octane;
3-(3-Cyc!cprocyimethyithio-1.2,5-thiadiazci-4-yi)-1-azabicycio[2.2.2]octane;
3-(4-F!ucrcbenzyithio-'i,2.5-thiaaiazo!-4-yi)-VazaDicycio[2.2.2]oc:ane;
Exo-6-(3-(4-f!ucrobenzyithio)-1,2.5-thiaa:azci-4-yl)-l -azabicycio [3.2.1 1 octane:
Exc-5-(3-{4-cr.icrocenzylthio)-'; ,2,5-thiadiazc:-4-yl)-l-azaDicycio[3.2."!]octane;
Exc-6--'3-(4-meir.yibenzyithio!-'i .2,5-ihiaaiazc:-4-yi)-l-azaDicyciof3.2.1 ]-
octane:

(5S.6S)-6-(3-(4-cyanoDenzyithioi-1,2.5-thiaaiazol-4-yi)-1-azaDicycio[3.2.1 ]-
octane;
?5S.6R)-6-(3-proDyithio-l.2,5-thiaaiazoJ-4-yl)--I-azaD;cyc!oi3.2.":]octane;
(5R.6R)-6-(3-isohexyithio-1,2,5-thiaaiazoi-4-yi)-1 -azabicycio [3.2.1 ] octane;
(5S.6S)-6-(3-isohexyithio-1,2.5-thiadiazor-4-yi)-1-azaDicycio[3.2.1]octane;
(5R.6S)-6-(3-isonexyithio-1.2,5-thiaaiazci-4-yl)-1-azabicyc:o[3.2.1 ]octane;
(5S,6R)-6-(3-(4,414-tnflucrccutyithio)-1.2,5-tniadiazoi-4-yi)-1 -azaDicycio [3.2.1 ]-
octane;
(5R,6S)-6-(3-(4,4,4-trifluorobutylthio)-1.2,5-thiadiazol-4-yl)-1 -azabicycio [3.2.1 ]-
octane;
(5S.6R)-6-(3-(4-cyanobenzyithio)-1,2,5-thiadiazcl-4-yl)-1 -azabicycio [3.2.1 ]-
octane;
;5R.63)-6-(3-(4-cyanooenzyithio)-1,2,5-thiaaiazcl-4-yi)-1-azaDicycio[3.2.1 ]-
octane;
i5R.6S;-6-(3-propyithio-l,2,5-thiaaiazci-4-yi)-1-azabicycic[3.2.1jCCtane;
(5R.6R)-6-(3-(3,3,3-trifluoropropyithio)-1,2.5-thiaaiazoi-4-yi)-1-azabicycio-
[3.2.1] octane;
:;5R.6Ri-6-(3-(3-{2-thienyi)prcoyithio';-1!2.5-thiaaiazci-4-yl)-1-3zabicycio-
'3.2. ^octane:
Exc-6-i3-(4-trifiuoromethoxyDenzyithio)-1,2.5-thiaaiazol-4-yl)-1-azaDicycio-
[3.2.-.] octane; • '
Exo-6-;3-(44hiccarDamyibenzyithio)--;.2.5-thiaaiazoi-4-yi)-1-azaDicyc:oi3.2.1]-
Exo-6-(3-(«i-methyisuifonyibenzyithici-1.2.5-thiaaiazoi-4-yi)-1-azabicycic-
[3.2.":'octane;
Exo-6-(3-(5,5.5-trifluoroDentylthioi-1.2.5-thiaciiazoi-4-yl)-l -azabicycio[3.2.1 ]-
octane:
Exo-6-{3-(3,3.3-triflucrcprooyithio)-1,2.5-thiaaiazol-4-yl)-1 -azabicycio [3.2.1 ]-
octane;
Endo-6-(3-(4-trifluoromethoxybenzylthio)-1,2t5-thiadiazol-4-yl)-1-azabiqrdo-
[3.2.1 Joctane;
Endo-6-(3-(4-methylbenzyithio)-1.2.5-thiaGiazoi-4-yl)-1-azabicycic!3.2.1]-
cctane:
Endo-6-(3-(4-?luoroDenzyithio)-1,2,5-thiaaiazoi-4-yi)-1 -azaoicyc:o[3.2.1 ]-
octane:
(5R.6R)-6-(3-prcpyisuifcnyi-1.2,5-thiaaiazoi-4-yl)-1-azabicycio! 3.2.1 ]octane;
;5S.6Si-5-(3-prcpyisulfonyi-1.2.5-ihiaaiazoM-yl)-1 -azabicyclo[3.2.1 loctane;
'5R.6R'.-5-(3-(4-cyancDenzyithici-1.2.5-thiaaiazci-i-yi)-1-azaDicyc:o[3.2.1]-
cctane:
:5R.6R)-6-(3-(4,4.4-trifluorobutyithio)-1.2.5-thiadiazoi-4-yl)-1 -azaDicyclo[3.2.1 ]-
octane;
(5R.6S}-6-(3-(3,3.3-trif!uoropropyithio)-1,2,5-thiadiazci-4-yl)-1-azabicycio-
¦ 3.2.1 ] octane;
or a onarmaceutically acceptable salt thereof.
Particularly preferred compounds for use in creating
anxiety include:
3-(3-KEXYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO[2.2.2]OCTANE;
3-(3-(3-PHENYLPR0PYLTHI0)-1,2,5-THIADIAZOL-4-YL5-1-
AZABICYCLC[2.2.2jOCTANE;
3-(3-CHLORO-i,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2)OCTANE
(EXO(+-i)-6-(3-CHLORO-l,2,5-THIADIAZOL-4-YL)-1-AZA3ICYCL0-
(3.2.1)OCTANE
3-(3-ETKOXY-l,2,5-THIADIAZOL-4-YL!-1-AZABICYCLC(2.2.2iOCTANE
3-(3-PROPOXY-l,2,5-THIADIAZOL-4-YL;-i-AZAEICYCLO(2.2.2}OCTANE
3 -(3-BUTYLTHIO-1,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2}OCTANE
3- (3-PENTYLTHIO-l,2,5-THIADIAZOL-4-YL) -1-AZABICYCLO (2 .2 . 2 ) CCTAI^TE
ENDO(-r-) -6- (3-ETKYLTKIO-l,2,5-THIADIAZOL-4-YL) -1-AZABICYCLO-
(3.2.1)OCTANE
ENBO(+-)-6-(3-BUTYLTHIO-1,2,5-THIADIAZOL-4-YL;-I-AZABICYCLO-
(3.2.1)OCTANE
EXO(+-)-6-(3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLC-
(3.2.1)OCTANE
3-(3-(3UTOXY-l,2,5-THIADIAZOL-4-YLi-i-AZABICYCLO(2.2.2)OCTANE
EXO-3-(3-PROPYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO-
(2.2.1)HEPTANE
EXO-3-(3-BUTYLTHIO-1,2,5-THIADIAZOL-4-YD-1-AZABICYCLO(2.2 . 1)-
HEPTANE
ENDC-3-(5-3UTYLTHIO-1,2,5-THIADIAZOL-4-YL)-1-AZA3ICYCL0(2.2. 1; -
HEPTANE
3 - ¦: 3 -ETHYLTHIO-1, 2 , 5-THIADIAZOL-4-YL) -1-AZABICYCLO(2. 2.2) OCTANE
3-;3-PRO?YLTHIO-l,2,5-THIADIAZOL-4-YD-1-AZABICYCLO(2.2.2:OCTANE
4-CHLORO-3-(3-PROPYLOXY-l,2,5-THIADIAZOL-4-YL;-1-AZABICYCLO-
(3.3 . DNON-2-ENE
3-(3-ISOPENTYLOXY-l,2,5-THIADIAZOL-4-YL;-1-AZABICYCLO *2.2.2;-
EN3C(+-)3-(3-PROPYLTKIO-l,2,5-THIADIAZOL-4-YL}-1-AZA3ICYCL0-
(3.2.1)OCTANE
EXO(+-)3-(3-PROPYLTHIO-l,2,5-THIADIAZOL-4-YL!-1-AZABICYCLO-
(3.2.1)OCTANE
-)3-;3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2i-
OCTANE ' '¦ ¦
(+)3-(3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2)-
OCTANE
3-;3-CHLORO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2)OCTANE
(EXC;'+- . : -5- •3-CHLORC-l, 2, 5-TKIADIAZOL-4-YL; -1-AZABICYCLO-
(3.2.I.1 OCTANE
3-'3-ETHOXY-1.2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2)OCTANE
3- :'3 -PROPOXY-1, 2 , 5-THIADIAZCL-4-YL) -1-AZA3ICYCL0 (2 .2.2) OCTANE
3 -(3-3UTYLTHI0-1,2,5-THIADIAZOL-4 -YL)-1-ASABICYCLOi2.2.2)OCTANE
3-13-PENTYLTHIO-1,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2)OCTANE
ENDCi+-)-5-(3-ETHYLTHIO-1,2, 5-THIADIAZOL-4-YL,--1-AZABICYCLG-
(3.2.1)OCTANE
ENDO (+-) -6- (3-BUTYLTHIO-l, 2, 5-THIADIAZOL-4-YL) -1-AZABICYCLO-
(3.2.1)OCTANE
EXO(+-)-6-(3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO-
(3.2.1)OCTANE
3 -!3 -(BUTOXY-1,2,5-THIADIAZOL-4 -YL;-1-AZABICYCLO(2.2.2)OCTANE
EXO-3-(3-PROPYLTKIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2 . 2 .1) -
HEPTANE
3 -(3-ETHYLTHIO-1,2,5-THIADIAZOL-4 -YL}-1-AZABICYCLO(2.2.2)OCTANE
EXO-3-(3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.1)-
HEPTANE
ENDO-3-(3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.1)-
HEPTANE
3 -(3-ETHYLTHIO-1,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2)OCTANE
3-(3-PROPYLTHIC-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2)OCTANE
4-CHLORO-3-(3-PROPYLOXY-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO-
(3.3 . DNON-2-EKE
3-(3-ISOPENTYLOXY-l,2,5-THIADIAZOL-4-YD-1-AZABICYCLO-
(2.2.2)OCTANE
ENDO(+-)3-(3-PROPYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO-
(3.2.1)OCTANE
BIS-1,4 -(3 -(1-METHYL-1,2,5,6-TETRAHYDROPYRIDIN-3 -YL)-1,2,5-
THIADIAZOL-4 -YL)BUTANEDITHIOL
EX0(+-)3-(3-PROPYLTHIO-l,2,5-THIADIAZCL-4-YL)-1-AZABICYCLO-
(3.2.1)OCTANE
(-)3-(3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZA3ICYCLC-
(2.2.2)OCTANE
(+)3-(3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCL-O-
(2.2.2.) OCTANE; AND
a pharmaceutically acceptable salt thereof.
More preferred compounds include the following:
3-!3-BUTYLTHIO-l,2,5-THIADIAZOL-4-Y1;-1-AZA3ICYCL0(2.2.2)OCTANE
3-(3-PENTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZA3ICYCL0(2.2.2)OCTANE
ENDO(±)-6-(3-ETHYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO-
(3.2.1)OCTANE
EKDO(±)-6-(3-3UTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZA3ICYCL0-
(3.2.1)OCTANE
EXO(i)-6-(3-BUTYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-AZA3ICYCL0-
(3.2.1)OCTANE
3-(3-?ROPYLTHIO-l,2,5-THIADIAZOL-4-YL)-1-
AZABICYCLO(2.2.2)OCTANE; or
a pharmaceutical^ acceptable salt thereof.
Compound which are particularly preferred include:
3 -(3-BUTYLTHIC-1,2,5-THIADIAZOL-4-YL)-1-AZABICYCLO(2.2.2)OCTANE;
or a pharmaceutically acceptable salt thereof

WE CLAIM
1. Use cf a compound of Formula I

wherein
X is oxygen or sulphur;
R is hydrogen, amino, halogen, -CHO, -NC2, -OR4, -SR4, -SOP.4,
-SO2R4, C3_7-cycloalkyl, C4-8-(cycloalkyialkyl;, -Z-C3-7-
cycloalkyl, and -Z-C4-3- (cycloalkyialkyl) wherein P.4 is straight
or branched Ci_i5-alkyl, straight or branched C2-i5~alkenyl,
straight or branched C2-i5-alkynyl, each of which is optionally
substituted with one or more halogens, -CF3, -CN, phenyl or
phenoxy wherein phenyl or phenoxy is optionally substituted with
halogen, -CK, Ci-4-alkyl, Ci-4-aikoxy, -OCF3, -CONH2 or -CSNH2;
cr P. is phenyl or benzyloxycarbcnyl, each of which is optionally
substituted with halogen, -CN, Ci-4-alkyl, Ci-4-alkoxy, -OCF3,
-CONH2 or -CSNH2; or P. is -OR5Y, -SR5Y, -OR5ZY, -SR5ZY, -3-R4-Z-
R- or -S-R4-Z-R5 wherein Z is oxygen or sulphur, P.5 is straight
or branched Ci-is-alkynyl, and Y is a 5 or 6 membered
heterocyclic group containing one tc four N, C cr S atomfs) or a
combination thereof, which heterocyclic group is optionally
substituted at carbon cr nitrogen atom(s) with straight or
branched Ci-g-alkyl, phenyl cr benzyl, or which heterocyclic
group is optionally fused with a phenyl group; and G is selected
from one cf the following azabicyclic rings
wherein the thiadiazoie or oxadiazole ring can be attached at
any carbon atom of the azabicyclic ring; P1 and R2 may be
present at any position, including the point of attachment of
the thiadiazoie or oxadiazole ring, and independently are
hydrogen, straight or branched C1-5-alkyl, straight or branched
C2-5 alkenyl, straight or branched C2-5-alkynyl, straight or
branched C1-10-alkoxy, straight or branched C1-5-alkyl
substituted with -OH, OR4, halogen, -NH2 or carboxy; R3 is H,
straight or branched C1-5-alkyl, straight or branched C2-5-
alkenyl or straight or branched C2-5-aIkynyi; n is 0, 1 or 2; m
is 0, 1 or 2; p is 0, 1 or 2; q is i or 2; and is a single
or double bond; or
a pharmaceutically acceptable salt thereof for the manufacture
of a medicament for the treatment of anxiety.
2. The use of a compound of Formula I according to
Claim 1 wherein X is S, G is
wherein n is 1, p is 1 or 2 and m is 1 or 2, and R1 and R2
independently are hydrogen, methyl, methoxy, hydroxy, halogen or
amino; or a pharmaceutically acceptable salt thereof.
3. The use of a compound of Formula I according to
Claim 1 wherein X is S, G is
wherein n is 1, p is 1 and m is 2, and R1 and R2 are hydrogen;
or a pharmaceutically acceptable salt thereof.
4. The use of a compound of rormula ± according to
Claim 1 wherein X is S, G is

wherein n is 1, p is 1 and m is 2, and R1 and R2 are hydrogen
and R4 is straight or branched C1-15-alkyl; or a pharmaceutically
acceptable salt thereof.
5. The use of a compound of Formula I according to
Claim 1 wherein X is S, G is
wherein n is 1, p is 1 and m is 2, and R1 and R2 are hydrogen
and R4 is C4-15 branched alkyl; or a pharmaceutically- acceptable
salt thereof.
6. The use of a compound of Formula I according to
Claim 1 wherein X is 3, G is
wherein n is 1, p is 1 and m is 2, and R1 and P2 are hydrogen
and R4 is straight C3-5-alkyi; or a pharmaceutically acceptable
salt thereof.

The present invention provides a method for treating
anxiety in humans using heterocyclic compounds.