PROCESS FOR PRODUCING AMINO ACID N-CARBOXYANHYDRIDE
申请人:Fujita Yukihiro
公开号:US20070015932A1
公开(公告)日:2007-01-18
The present invention provides a process for producing an amino acid N-carboxyanhydride, which comprises reacting an amino acid or a derivative thereof with a compound represented by the following formula (1):
wherein R
1
and R
2
represent the same or different electron-withdrawing substituents and each independently are an optionally substituted acyl group, an optionally substituted alkyloxycarbonyl group, an optionally substituted perfluoroalkyl group, an optionally substituted perchloroalkyl group, a cyano group, a halogen atom, or a nitro group; and a and b are the same or different and each are an integer of 1-5.
The asymmetricepoxidation of chalcone and other electron-poor olefins in a triphasesystem (water-organic solvent-polyaminoacid) affords optically active oxiranes. The influence of the molecular structure of catalysts and of their secondary conformation on the enantioselectivity of the reaction has also been examined.