Imidazole Derivatives as Accelerators for Ruthenium-Catalyzed Hydroesterification and Hydrocarbamoylation of Alkenes: Extensive Ligand Screening and Mechanistic Study
作者:Hideyuki Konishi、Takashi Muto、Tsuyoshi Ueda、Yayoi Yamada、Miyuki Yamaguchi、Kei Manabe
DOI:10.1002/cctc.201402986
日期:2015.3
Imidazole derivatives are effective ligands for promoting the [Ru3(CO)12]‐catalyzed hydroesterification of alkenes using formates. Extensive ligand screening was performed to identify 2‐hydroxymethylated imidazole as the optimal ligand. Neither carbon monoxide gas nor a directing group was required, and the reaction also showed a wide substrate generality. The Ru–imidazole catalyst system also promoted
咪唑衍生物是使用甲酸酯促进[Ru 3(CO)12 ]催化的烯烃加氢酯化反应的有效配体。进行了广泛的配体筛选,以确定2-羟甲基化的咪唑为最佳配体。既不需要一氧化碳气体也不需要引导基团,并且该反应还显示出广泛的底物通用性。Ru-咪唑催化剂体系还促进了分子内的氨基甲酰化作用,以提供内酰胺。通过X射线晶体学分析明确地分析了Ru-咪唑配合物,它具有源自[[Ru 3(CO)12 ]和两个配体的三核结构。该配合物也已成功用于加氢酯化。通过使用D详细检查了该机制-和13 C标记的甲酸酯,表明加氢酯化反应是通过脱羰基-再羰基化途径进行的。