Disclosed herein an overall methodology constitutes an equivalent to the long sought after enantioselective intramolecular oxa-Michael (IOM) reaction of carboxylic acids. An organocatalyzed IOM reaction of in situ formed peroxy hemiacetals followed by a Kornblum DeLaMare type rearrangement cascade provides a broad class of chiral lactones in good yields and with excellent enatioselectvities. Remarkably
本文公开了一种总体方法,其等同于对
羧酸的对映选择性分子内氧杂-迈克尔(IOM)反应的长期追求。原位形成的过氧
半缩醛的有机催化IOM反应,然后进行Kornblum DeLaMare型重排级联反应,可以提供大量的手性内酯,收率高,对映选择性高。值得注意的是,无需任何
硅胶柱色谱即可获得纯手性内酯,并且在许多情况下,通过简单的己烷洗涤分离的固体产物,进一步提高了对映选择性。