Cobalt-Catalyzed Asymmetric Hydroboration/Cyclization of 1,6-Enynes with Pinacolborane
作者:Songjie Yu、Caizhi Wu、Shaozhong Ge
DOI:10.1021/jacs.7b01708
日期:2017.5.17
We report a cobalt-catalyzed asymmetric hydroboration/cyclization of 1,6-enynes with catalysts generated from Co(acac)2 and chiral bisphosphine ligands and activated in situ by reaction with pinacolborane (HBpin). A variety of oxygen-, nitrogen-, and carbon-tethered 1,6-enynes underwent this asymmetric transformation, yielding both alkyl- and vinyl-substituted boronate esters containing chiral tetrahydrofuran
我们报告了钴催化的 1,6-烯炔不对称硼氢化/环化反应,催化剂由 Co(acac)2 和手性双膦配体生成,并通过与频哪醇硼烷 (HBpin) 反应原位活化。各种氧-、氮-和碳-连接的 1,6-烯炔经历了这种不对称转化,产生了含有手性四氢呋喃、环戊烷和吡咯烷部分的烷基和乙烯基取代的硼酸酯,具有高到出色的对映选择性(86%) -99% ee)。