Highly Enantio- and Diastereoselective One-Pot Synthesis of Acyclic Epoxy Alcohols with Three Contiguous Stereocenters
作者:Alice E. Lurain、Aaron Maestri、Ann Rowley Kelly、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1021/ja046750g
日期:2004.10.1
Two highly enantio- and diastereoselective one-pot procedures for the synthesis of epoxy alcohols with up to three contiguous stereocenters are reported. Route one involves asymmetric addition of an alkylzinc reagent to an enal followed by diastereoselective epoxidation. Route two entails asymmetric vinylation of an aldehyde with divinylzinc reagents and subsequent diastereoselective epoxidation. The
报道了用于合成具有多达三个连续立体中心的环氧醇的两种高度对映选择性和非对映选择性的一锅法。途径一涉及将烷基锌试剂不对称加成到烯醛,然后进行非对映选择性环氧化。路线二需要醛与二乙烯基锌试剂的不对称乙烯基化和随后的非对映选择性环氧化。用于环氧化的氧化剂是通过将烯丙基醇盐中间体和剩余的有机锌试剂暴露于双氧而产生的。在加入催化性四异丙醇钛后,定向环氧化以良好到极好的收率产生环氧醇。