Enantio- and Regioselective Ir-Catalyzed Hydrogenation of Di- and Trisubstituted Cycloalkenes
作者:Byron K. Peters、Jianguo Liu、Cristiana Margarita、Wangchuk Rabten、Sutthichat Kerdphon、Alexander Orebom、Thomas Morsch、Pher G. Andersson
DOI:10.1021/jacs.6b07291
日期:2016.9.14
carbons away from the olefin. Substrates having functionalities such as carboxyl groups, alcohols, or heterocycles in the vicinity of the C═C bond were hydrogenated in high enantiomeric excess (up to >99% ee). The hydrogenation was also found to be regioselective, and by controlling the reaction conditions, selective hydrogenation of one of two trisubstituted olefins can be achieved. Furthermore, trisubstituted
使用新型 N,P-连接的铱咪唑基催化剂(Crabtree 型)制备并评估了许多环烯烃的不对称加氢反应。这些环烯烃的多样性跨越了那些具有很少功能的环烯烃到带有强配位取代基和杂环的环烯烃。对于几乎没有官能度(高达 > 99% ee)的底物和具有远离烯烃几个碳的官能团的底物,均观察到了优异的对映选择性。在 C=C 键附近具有羧基、醇或杂环等官能团的底物以高对映体过量(高达 > 99% ee)氢化。还发现氢化具有区域选择性,并且通过控制反应条件,可以实现两种三取代烯烃之一的选择性加氢。此外,三取代的烯烃可以在四取代的烯烃存在下选择性氢化。