The present invention relates to a process for preparation of dexmethylphenidate hydrochloride from racemic methylphenidate. The process involves the treatment of racemic mixture of dl-throe-methylphenidate base in the presence of di-pivaloyl-D-tartaric acid (D-DPTA) in a solvent to isolate dipivaloyl tartrate salt ...

The present invention relates to to a novel process for preparation of L-l-phenyl-2-(pyrrolidin-l-yl)propan-l-ol wherein the said process yields N-pyrrolidinyl norephedrine without using L-norephedrine as a starting material. More particularly, the present invention relates to a process to prepare N-pyrrolidinyl nor...

The present invention relates to a new and improved process for preparation of ractopamine hydrochloride. More particularly, the invention relates to a novel method wherein the ractopamine hydrochloride produced is substantially pure with very low level of impurities and further comprises a precisely controlled rati...

A novel process for reductive amination of L-phenylacetylcarbinol with an arylnitromethane or arylmethylamine compound in presence of noble catalytic system comprising of platinum and palladium individually or in combination to yield optically active L-norephedrine with high diastereomeric selectivity and enantiomer...

[0073] The invention involves condensation of various derivatives of cyclic alkene alcohols of Formula II or Formula III where, R1 is alkyl, aryl, alkyl aryl or heterocyclic carbamoyl. R2 is either R1 as mentioned earlier or an acyl group, -C(=O)-R3 where, R3 is selected from a group comprising (subst)C1-C12 alkyl, ...

The invention discloses a method for preparation of cannabidiol, which comprises preparing an activated mentha-2,8-diene-1-ol, coupling the activated mentha-2,8-diene-1-ol with 5 substituted resorcinol to obtain cannabidiol, coupling the activated mentha-2,8-diene-1-ol with 5,6 disubstituted resorcinol to obtain can...

A method for preparation of diastereomeric lactate salts of 1-(1-naphthyl)ethyl amine and pure enantiomers of 1-(1-naphthyl)ethyl amine [0054] The invention relates to a method for preparation of pure enantiomers of 1-(1-naphthyl)ethyl amine by preparing lactate salt with chiral lactic acid as resolving agent...

A process for preparation of methadone hydrochloride [0031] The present invention discloses a process for preparation of methadone hydrochloride. The process comprises steps of condensing diphenyl acetonitrile with l-dimethylamino-2-chloropropane to obtain methadone nitrile, solvent extraction of methadone nitril...

A process of preparation of formaldehyde tolerant transaminases for the transamination of 4-hydroxy-2-butanone [0047] The present invention discloses a process of preparation of formaldehyde tolerant transaminases and their use for the transamination of 4-hydroxy-2-butanone. The process of preparation comprises ste...