Insights into a Chemoselective Cobalt Catalyst for the Hydroboration of Alkenes and Nitriles
作者:Abdulrahman D. Ibrahim、Steven W. Entsminger、Alison R. Fout
DOI:10.1021/acscatal.7b00362
日期:2017.5.5
A chemoselective hydroboration protocol with terminal alkene substrates is reported using an electron-rich, low-valent cobalt pincer compound. The process is catalytic and leads to exclusive formation of anti-Markovnikov products, tolerating amino groups, esters, epoxides, ketones, and other functionalities. The protocol was successfully extended toward the hydroboration of nitriles, generating the
据报道,使用富电子的低价钴夹钳化合物,可在末端带有烯烃底物的情况下进行化学选择性硼氢化反应。该过程具有催化作用,并导致抗马尔科夫尼科夫产物的独家形成,可耐受氨基,酯,环氧化物,酮和其他功能。该方案已成功地扩展至腈的硼氢化反应,以中等至良好的产率生成了相应的胺。氘代频哪醇硼烷的标记研究提供了对该机理的认识,确定了氢化钴的中间体,以及插入,β氢化物消除和烯烃异构化途径。这些见解为观察到的区域选择性提供了理论基础,并允许我们提出催化机制。