Stereoselective Transfer Semi-Hydrogenation of Alkynes to <i>E</i>
-Olefins with <i>N</i>
-Heterocyclic Silylene-Manganese Catalysts
作者:Yu-Peng Zhou、Zhenbo Mo、Marcel-Philip Luecke、Matthias Driess
DOI:10.1002/chem.201705745
日期:2018.4.3
(NHSi = N‐heterocyclic silylene), respectively. They act as unprecedented very active and stereoselective Mn‐based precatalysts (1 mol % loading) in transfer semi‐hydrogenations of alkynes to give the corresponding E‐olefins using ammonia–borane as a convenient hydrogen source under mild reaction conditions. Complex [L1]MnCl2 shows the best catalytic performance with quantitative conversion rates and excellent
报告了第一个由Si II供体负载的锰(II)配合物[L1] MnCl 2,[L2] MnCl 2和[L3] 2 MnCl 2的合成和结构,其带有钳型双(NHSi)-吡啶配体L1,二齿双(NHSi)-二茂铁配体L2和两个单齿NHSi配体L3(NHSi = N-杂环亚甲硅烷基)。在炔烃的转移半加氢反应中,它们充当了前所未有的非常活泼和立体选择性的锰基预催化剂(负载量为1 mol%),从而生成相应的E在温和的反应条件下使用氨硼烷作为便利的氢源的烯烃。络合物[L1] MnCl 2在不同的炔烃底物上显示出最佳的催化性能,具有定量转化率和优异的E-立体选择性(最高98%)。可以容忍不同类型的官能团,但在1-苯基取代的炔烃的苯基上的CN,NH 2,NO 2和OH基除外。