Phase-Transfer-Catalyzed Enantioselective Mannich Reaction of Malonates with α-Amido Sulfones
作者:Francesco Fini、Luca Bernardi、Raquel P. Herrera、Daniel Pettersen、Alfredo Ricci、Valentina Sgarzani
DOI:10.1002/adsc.200600250
日期:2006.10
The highly enantioselective reaction between in situ generated, Cbz-protected azomethines and malonates in the presence of 150 mol % of potassium carbonate (50 % w/w) and 1 mol % of quinine-derived quaternary ammonium bromides as phase-transfer organocatalysts has been developed. This study reports a novel approach for the asymmetric Mannich-type reaction and a wide range of azomethines, including
在存在150 mol%碳酸钾(50%w / w)和1 mol%奎宁衍生的季铵溴化物作为相转移有机催化剂的情况下,原位生成的Cbz保护的偶氮甲磺酸和丙二酸酯之间存在高度对映选择性反应。发达。这项研究报告了一种用于不对称曼尼希型反应的新方法,本系统可耐受多种甲亚胺,包括衍生自可烯化醛的甲亚胺。以高达98%ee的高收率获得的加合物是光学纯的β-氨基酸的合适前体。