Asymmetric Synthesis of Chiral 1,4‐Enynes through Organocatalytic Alkenylation of Propargyl Alcohols with Trialkenylboroxines
作者:Jian‐Fei Bai、Kento Yasumoto、Taichi Kano、Keiji Maruoka
DOI:10.1002/anie.201904520
日期:2019.6.24
organocatalytic reaction between propargyl alcohols and trialkenylboroxines. Our strategy relies on acid‐mediated generation of the carbocationic intermediate from propargyl alcohols followed by enantioselective alkenylation with trialkenylboroxines. A range of chiral 1,4‐enynes were obtained in moderate to good yields with high levels of enantioselectivity. Use of a highly acidic chiral N‐triflyl phosphoramide
描述了通过炔丙基醇和三烯基环硼氧烷之间的有机催化反应进行的1,4-炔烃的高度对映选择性合成。我们的策略依赖于由炔丙醇通过酸介导的碳正离子中间体的生成,然后通过三烯基环硼氧烷对映选择性烯基化。以中等至良好的收率和高的对映选择性,获得了一系列手性的1,4-烯炔。已发现使用具有两个遥远的Lewis碱性氧原子的高酸性手性N-三氟乙磷酰胺催化剂对于本反应中的高反应性和选择性都至关重要。