作者:Jörg Pietruszka、Robert Christian Simon
DOI:10.1002/chem.201002130
日期:2010.12.27
Mannich type reactions of a preformed aldimine with various carbonyl compounds were investigated with a series of functionalised indoline derivatives as catalysts: indoline‐3‐carboxylic acid, the diphenylcarbinol analogue and O‐protected silyl ether analogues. All compounds were readily prepared in enantiopure form by using an enzymatic kinetic resolution as a key step (E≫100). The alcohol and ether
用一系列功能化的吲哚衍生物作为催化剂,研究了预制的醛亚胺与各种羰基化合物的曼尼希型反应:吲哚啉-3-羧酸,二苯甲醇类似物和O保护的甲硅烷基醚类似物。通过将酶动力学拆分作为关键步骤,可以容易地以对映纯形式制备所有化合物(E = 100)。醇和醚催化剂无法诱导完全的手性转移,但确实提供了高收率和高非对映异构体比例的曼尼希碱,而酸催化剂则以高度非对映和对映选择性的方式提供了产物。产品的绝对配置由syn - anti确定 异构化协议,是由空间要求苛刻的1,8-二氮杂双环[5.4.0] undec-7-ene引发的。