A Highly Enantioselective Mannich-Type Reaction of Glycine Schiff Base Catalyzed by a Cinchoninium Salt
作者:Zhonglin Tao、Arafate Adele、Xiang Wu、Liuzhu Gong
DOI:10.1002/cjoc.201400453
日期:2014.10
A chiral phase‐transfer catalyst, derived from the combination of cinchona alkaloid backbone and BINOL skeleton, enabled a Mannich reaction of glycine Schiff base with N‐Boc‐imines to generate α,β‐diamino acid derivatives in excellent yields (up to 99%) and with high diastereo‐ and enantioselectivities (up to>20:1 dr, 96% ee).
源自金鸡纳生物碱骨架和BINOL骨架的手性相转移催化剂,使甘氨酸Schiff碱与N-Boc-亚胺进行曼尼希反应,能够以极高的收率(高达99%)生成α,β-二氨基酸衍生物)和非对映异构体和对映异构体具有很高的选择性(高达> 20:1 dr,96%ee)。