Efficient <i>Z</i>-Selective Semihydrogenation of Internal Alkynes Catalyzed by Cationic Iron(II) Hydride Complexes
作者:Nikolaus Gorgas、Julian Brünig、Berthold Stöger、Stefan Vanicek、Mats Tilset、Luis F. Veiros、Karl Kirchner
DOI:10.1021/jacs.9b09907
日期:2019.10.30
The bench-stable cationic bis(σ-B-H) aminoborane complex [Fe(PNPNMe-iPr)(H)(η2-H2B=NMe2)]+ (2) efficiently catalyzes the semi-hydrogenation of internal alkynes, 1,3-diynes and 1,3-enynes. Moreover, selective incorporation of deuterium was achieved in the case of 1,3-diynes and 1,3-enynes. The catalytic reaction takes place under mild conditions (25oC, 4-5 bar H2 or D2) in 1 h and alkenes were obtained
长期稳定的阳离子双 (σ-BH) 氨基硼烷复合物 [Fe(PNPNMe-iPr)(H)(η2-H2B=NMe2)]+ (2) 有效催化内部炔烃,1,3-二炔的半氢化和 1,3-烯炔。此外,在 1,3-二炔和 1,3-烯炔的情况下实现了氘的选择性掺入。催化反应在温和条件(25oC,4-5 bar H2 或 D2)下进行 1 小时,并获得了对广泛底物具有高 Z 选择性的烯烃。通过 DFT 计算提供了对催化反应的机理洞察,也解释了立体选择性和化学选择性。发现具有双二氢部分 [Fe(PNPNMe-iPr)(η2-H2)2]+ 的中间体起着关键作用。