Kinetic Resolution of Racemic Secondary Benzylic Alcohols by the Enantioselective Esterification Using Pyridine-3-carboxylic Anhydride (3-PCA) with Chiral Acyl-Transfer Catalysts
作者:Isamu Shiina、Kenya Nakata、Keisuke Ono、Teruaki Mukaiyama
DOI:10.1002/hlca.201200434
日期:2012.10
production of chiral carboxylic esters by the combination of chiral nucleophilic catalyst, such as tetramisole (=2,3,5,6‐tetrahydro‐6‐phenylimidazo[2,1‐b][1,3]thiazole) derivatives. An efficient kinetic resolution of racemic benzylic alcohols with achiral carboxylic acids was achieved by using 3‐PCA in the presence of (R)‐benzotetramisole ((R)‐BTM), and a variety of optically active carboxylic esters were
发现吡啶-3-羧酸酐(3-PCA)是一种有效的偶联剂,可在温和的条件下通过简单的实验程序从各种羧酸与醇制备羧酸酯。这种新型缩合剂3-PCA不仅适用于由4-(二甲氨基)吡啶(DMAP)催化的非手性羧酸酯的合成,而且还适用于通过手性亲核催化剂(如四甲酚( = 2,3,5,6-四氢-6-苯基咪唑[2,1- b ] [1,3]噻唑)衍生物。在(R)-苯并四咪唑((R)-BTM),并且通过这种新的手性诱导系统在不使用叔胺的情况下生产了具有高对映体过量的多种旋光羧酸酯。