Tandem Catalysis: The Sequential Mediation of Olefin Metathesis, Hydrogenation, and Hydrogen Transfer with Single-Component Ru Complexes
作者:Janis Louie、Christopher W. Bielawski、Robert H. Grubbs
DOI:10.1021/ja016431e
日期:2001.11.1
extensive use in olefin metathesis, it was also recently shown to be an effective precatalyst for mediating radical additions and hydrogenation reactions. We recently demonstrated all three reactions could be performed in tandem to afford well-defined block copolymers. Herein, we report that complex 1, or its more active derivative 2, is also useful in mediating a variety of other catalytic hydrogenation
有机金属催化剂传统上被设计和优化以介导单一反应。然而,对方便有效的合成过程日益增长的需求需要开发能够直接或通过简单修饰催化多种机械不同反应的有机金属试剂。虽然 Ru 配合物 (PCy_3)_2Cl_2Ru= CHPh (1) 在烯烃复分解中得到了广泛的应用,但最近它也被证明是一种有效的预催化剂,用于介导自由基加成和加氢反应。我们最近证明了所有三个反应都可以串联进行,以提供明确定义的嵌段共聚物。在此,我们报告复合体 1,或其更活跃的衍生物 2,也可用于介导各种其他催化氢化反应,包括区域特异性酮和烯烃还原、酮的转移氢化和醇的脱氢氧化。此外,我们展示了各种用于快速构建小分子的“一锅”串联复分解加氢程序,包括 (R)-(-)-Muscone。