作者:Sunggi Lee、Philip S. J. Kaib、Benjamin List
DOI:10.1021/jacs.6b11993
日期:2017.2.15
A direct enantioselective synthesis of substituted oxygen heterocycles from lactol acetates and enolsilanes has been realized using a highly reactive and confined imidodiphosphorimidate (IDPi) catalyst. Various chiral oxygen heterocycles, including tetrahydrofurans, tetrahydropyrans, oxepanes, chromans, and dihydrobenzofurans, were obtained in excellent enantioselectivities by reacting the corresponding
已经使用高反应性和受限的亚胺二磷亚胺酯 (IDPi) 催化剂实现了由乳醇乙酸酯和烯醇硅烷直接对映选择性合成取代氧杂环。各种手性氧杂环,包括四氢呋喃、四氢吡喃、氧杂环己烷、色满和二氢苯并呋喃,通过相应的内酯乙酸酯与多种烯醇硅烷反应以优异的对映选择性获得。机理研究表明,该反应通过与受限手性抗衡阴离子配对的不稳定、脂肪族、环状氧代碳鎓离子中间体进行。