[EN] NEW SYNTHETIC ROUTE FOR THE PREPARATION OF ß-AMINOBUTYRYL SUBSTITUTED 5,6,7,8-TETRAHYDRO[1,4]DIAZOLO[4,3-alpha]PYRAZIN-7-YL COMPOUNDS [FR] NOUVELLE VOIE DE SYNTHÈSE POUR LA PRÉPARATION DE COMPOSÉS DE 5,6,7,8-TÉTRAHYDRO[1,4]DIAZOLO [4,3-ALPHA]PYRAZIN-7-YLE SUBSTITUÉS PAR SS-AMINOBUTYRYLE
The present invention relates to novel pharmaceutically acceptable salts of sitagliptin, to processes for their preparation and to pharmaceutical compositions containing them.
Asymmetric reductive amination of beta-keto amides catalyzed by the chiral catalyst Ru(OAc)(2)((R)-dm-segphos) produces unprotected beta-amino amides with high yields and high enantioselectivities (94.7-99.5% ee). This "one-pot" methodology is general in substrate scope and has been successfully employed to produce sitagliptin with 99.5% ee and 91% assay yield. The excellent reaction efficiency is attributed to the remarkable tolerance to high concentrations of ammonium ion, the high chemoselectivity, and the high enantiosetectivity (99.5% ee) of the Ru catalyst system.
[EN] PROCESSES FOR THE PREPARATION OF SITAGLIPTIN AND PHARMACEUTICALLY ACCEPTABLE SALTS THEREOF<br/>[FR] PROCÉDÉS DE PRÉPARATION DE SITAGLIPTINE ET SELS PHARMACEUTIQUEMENT ACCEPTABLES DE CELLE-CI
申请人:REDDYS LAB LTD DR
公开号:WO2009085990A3
公开(公告)日:2009-09-03
[EN] PREPARATION OF SITAGLIPTIN AND SALTS THEREOF<br/>[FR] PRÉPARATION DE LA SITAGLIPTINE ET DE SES SELS
申请人:REDDYS LAB LTD DR
公开号:WO2011060213A2
公开(公告)日:2011-05-19
Processes for preparing sitagliptin and its pharmaceutically acceptable salts, and process intermediates.