Novel Process for the Preparation of Nonracemic Long Chain alpha-Amino Acid Derivatives
申请人:Jia Lanqi
公开号:US20090036708A1
公开(公告)日:2009-02-05
The present invention provides a process for the preparation of a nonracemic a-amino acid derivative from an optically active N-acyl lactam using an organometallic reagent to effect the opening of the ring followed by reduction of the ketone carbonyl to an alcohol or a methylene, or by a reductive amination to an amine, or by a ketalization reaction.
using chiral N-tert-butanesulfinyl imines as reaction intermediates, is described. The reaction of organolithium and Grignard reagents with hydroxy Weinreb amides, chemoselective N-tert-butanesulfinyl aldimine formation from keto aldehydes, decarboxylativeMannichreaction with β-keto acids of these aldimines, and organocatalyzed L-proline intramolecular Mannich cyclization are key steps of this methodology