Nandi, M. M.; Choudhury, J.; Tarat, S., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1990, vol. 29, # 3, p. 288 - 291
[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF DEXMETHYL PHENIDATE HYDROCHLORIDE<br/>[FR] PROCÉDÉ DE PRÉPARATION AMÉLIORÉ DE L'HYDROCHLORURE DE DEXMÉTHYLE PHÉNIDATE
申请人:HARMAN FINOCHEM LTD
公开号:WO2018015971A1
公开(公告)日:2018-01-25
Disclosed herein a process for the preparation of highly pure dexmethylphenidate hydrochloride (Formula-I) which comprises the steps of neutralization of dl- threomethylphenidate hydrochloride to dl-threo methylphenidate; subsequent resolution of dl-threo methylphenidate using amino acid or its derivatives as chiral resolution agent to yield dexmethylphenidate salt; hydrolysis of the salt and further conversion of dexmethylphenidate into its hydrochloride salt.
Method for producing optical-active cis-piperidine derivatives
申请人:——
公开号:US20040171836A1
公开(公告)日:2004-09-02
An optical-active cis-piperidine derivative of high chemical purity and high optical purity is efficiently produced through optical resolution of a cis-piperidine derivative mixture, racemic cis-piperidine derivative with an optical-active tartaric acid derivative or an optical-active amino acid derivative. For the optical-active tartaric acid derivative, preferred are optical-active di(paratoluoyl)tartaric acid and optical-active di(4-methoxybenzoyl)tartaric acid; and for the optical-active amino acid derivative, preferred is optical-active N-benzenesulfonylphenylalanine.
A neutral amino acid complex and a method for optical resolution of a DL-amino acid
申请人:AJINOMOTO CO., INC.
公开号:EP0132373A1
公开(公告)日:1985-01-30
For the optical resolution of a DL-amino acid, the DL-amino acid is reacted with an optically active N-acyl aspartic acid, and the two resulting diastereomers are separated by means of the difference between their solubilities. The required optically active amino acid then be obtained from the respective diastereomer.
PROCESS FOR PRODUCTION OF OPTICALLY ACTIVE CIS-PIPERIDINE DERIVATIVES
申请人:Toray Fine Chemicals Co., Ltd.
公开号:EP1457487A1
公开(公告)日:2004-09-15
An optical-active cis-piperidine derivative of high chemical purity and high optical purity is efficiently produced through optical resolution of a cis-piperidine derivative mixture, racemic cis-piperidine derivative with an optical-active tartaric acid derivative or an optical-active amino acid derivative. For the optical-active tartaric acid derivative, preferred are optical-active di(paratoluoyl)tartaric acid and optical-active di(4-methoxybenzoyl)tartaric acid; and for the optical-active amino acid derivative, preferred is optical-active N-benzenesulfonylphenylalanine.