PROCESS FOR PRODUCING N-(D-$g(a)-METHYL-$g(b)-MERCAPTOPROPIONYL)-L-PROLINE AND INTERMEDIATES THEREOF
申请人:KANEKA CORPORATION
公开号:EP0802182A1
公开(公告)日:1997-10-22
A highly convenient and efficient process for economically producing in a high yield high-quality captopril which is remarkably reduced in the content of impurities and has a high melting point and intermediates for synthesizing the same which contain only a small amount of precursors as impurities and have excellent qualities. The process comprises subjecting an acid halide and an L-proline to the Schotten-Baumann reaction and eliminating the impurities formed as the by-products in the form of the precursors represented by general formula (5) or (6) by treating, during or after the Schotten-Baumann reaction, the aqueous medium solution with active carbon or crystallization followed by deacylation. In the formula, R1 represents acyl and n represents an integer of from 2 to 4.
SIMPLE PROCESS FOR PRODUCING HIGH-QUALITY CAPTOPRIL
申请人:KANEKA CORPORATION
公开号:EP0889031A1
公开(公告)日:1999-01-07
A process for producing captopril of the following formula (1) comprising subjecting a substrate compound of the following general formula (2) to hydrolysis reaction in aqueous medium to remove RCO group and isolating, said hydrolysis reaction in aqueous medium being conducted in the presence of a strong acid at pH not over 1 and a reaction temperature not below 40°C.