Convenient preparation of highly active phase-transfer catalyst for catalytic asymmetric synthesis of α-alkyl- and α,α-dialkyl-α-amino acids: application to the short asymmetric synthesis of BIRT-377
作者:Zhenfu Han、Yukako Yamaguchi、Masanori Kitamura、Keiji Maruoka
DOI:10.1016/j.tetlet.2005.09.185
日期:2005.12
A highly active phase-transfer catalyst was conveniently prepared from the known, easily available (S)-4,5,6,4′,5′,6′-hexamethoxybiphenyldicarboxylic acid. This catalyst exhibited the high catalytic performance (0.01–1 mol %) in the asymmetric alkylation of N-(diphenylmethylene)glycine tert-butyl ester and N-(p-chlorophenylmethylene)alanine tert-butyl ester compared to the existing chiral phase-transfer
由已知的,容易获得的(S)-4,5,6,4',5',6'-六甲氧基联苯二羧酸方便地制备高活性相转移催化剂。与现有的手性相转移相比,该催化剂在N-(二苯基亚甲基)甘氨酸叔丁酯和N-(对氯苯基亚甲基)丙氨酸叔丁酯的不对称烷基化反应中表现出较高的催化性能(0.01-1 mol%)。催化剂,因此可以实现通用且有用的程序,用于高度实用的对映选择性合成结构多样的天然和非天然α-烷基-α-氨基酸以及α,α-二烷基-α-氨基酸。