AbstractVinylsilanes are highly appealing and convenient chemical derivatives, as evidenced by the increasing number of synthetic transformations utilizing this class of compounds. Herein, a new comprehensive cobalt‐catalyzed procedure has been developed enabling selective hydrosilylation of internal aryl‐, alkyl‐, and silylalkynes. Cobalt complexes bearing triazine‐based PNP pincer‐type ligands provide exclusive syn‐addition of primary as well as secondary silanes to C≡C bonds. As a result, (E)‐silylalkenes and vicinal disilylalkenes were effectively obtained with excellent stereoselectivity and regioselectivity. Unlike several TM‐catalyzed procedures, no external additives were required since hydrosilanes act as both substrates and activators.
摘要 乙烯基硅烷是一种极具吸引力且方便的化学衍生物,利用该类化合物进行的合成转化日益增多就是明证。在此,我们开发了一种新的综合钴催化程序,可对内部芳基、烷基和硅烷进行选择性氢化。含有三嗪基 PNP 钳子型配体的钴配合物可以将伯硅烷和仲硅烷完全加成到 C≡C 键上。因此,可以有效地获得(E)-硅烷烯和邻位二硅烷烯,并具有极佳的立体选择性和区域选择性。与几种 TM 催化过程不同的是,由于氢硅烷既是底物又是活化剂,因此不需要外加添加剂。