Synthesis of homochiral 3-substituted glutamic acids and prolines from pyroglutamic acid
作者:Claus Herdeis、Hans Peter Hubmann、Hermann Lotter
DOI:10.1016/s0957-4166(00)86204-7
日期:1994.3
Efficient syntheses of (2S,3S)-methylproline (5a) and (2S,3R)-phenylproline (5b) are described, starting from the readily available pyroglutaminol derivatives 2a and 2b via conjugate 1-4-addition of organocuprates to 1. Catalytic hydrogenation of 3 from the least hindered alpha-side furnishes 6, which is transformed to (2S,3R)-methylproline (7). 3-Substituted glutamic acids 8c,d are provided by a four step procedure from 2c,d.