An Achiral-Acid-Induced Switch in the Enantioselectivity of a Chiral cis-Diamine-Based Organocatalyst for Asymmetric Aldol and Mannich Reactions
作者:Shin A. Moteki、Jianwei Han、Satoru Arimitsu、Matsujiro Akakura、Keiji Nakayama、Keiji Maruoka
DOI:10.1002/anie.201107239
日期:2012.1.27
Pick and choose: The asymmetric synthesis of two different enantiomeric products has been achieved through the use of a single organocatalyst with or without achiral organic acid additives (see scheme). These additives may assist in altering the substrate orientations at the catalytic center, leading to efficient enantiomeric inversions in both aldol and Mannich products.
挑选:通过使用单一的有机催化剂,带有或不带有非手性有机酸添加剂,已经实现了两种不同对映体产物的不对称合成(参见方案)。这些添加剂可以帮助改变催化中心的底物取向,从而导致醛醇和曼尼希产物中的有效对映异构体转化。