Chiral Epoxides via Borane Reduction of 2-Haloketones Catalyzed by Spiroborate Ester: Application to the Synthesis of Optically Pure 1,2-Hydroxy Ethers and 1,2-Azido Alcohols
作者:Kun Huang、Haiyang Wang、Viatcheslav Stepanenko、Melvin De Jesús、Carilyn Torruellas、Wildeliz Correa、Margarita Ortiz-Marciales
DOI:10.1021/jo102294j
日期:2011.3.18
with 10% spiroaminoborate ester 1 as catalyst is described. By a simple basic workup of 2-halohydrins, optically active epoxides are obtained in high yield and with excellent enantiopurity (up to 99% ee). Ring-opening of oxiranes with phenoxides or sodium azide is investigated under different reaction conditions affording nonracemic 1,2-hydroxy ethers and 1,2-azido alcohols with excellent enantioselectivity
描述了以 10% 螺氨基硼酸酯1作为催化剂,对映选择性硼烷介导的多种 2-卤代酮的还原反应。通过 2-卤代醇的简单基础处理,可以高产率和优异的对映体纯度(高达 99% ee)获得光学活性环氧化物。在不同的反应条件下研究了环氧乙烷与酚盐或叠氮化钠的开环,得到具有优异对映选择性 (99% ee) 和良好至高化学收率的非外消旋 1,2-羟基醚和 1,2-叠氮醇。