Base-catalysed reductive relay hydroboration of allylic alcohols with pinacolborane to form alkylboronic esters
作者:Zi-Chao Wang、Di Shen、Jian Gao、Xian Jia、Youjun Xu、Shi-Liang Shi
DOI:10.1039/c9cc03459e
日期:——
An unprecedented base-catalysed reductive relay hydroboration of allylicalcohols is described. Commercially available nBuLi was found to be a robust transition metal-free initiator for this protocol, affording various boronic esters in high yield and selectivity. Mechanistically, this methodology involves a one-pot three-step successive process (dehydrocoupling/allylic hydride substitution/anti-Markovnikov
6‐trimethylphenyl) imidazol‐2‐ylidene] complex was found to be an efficient pre‐catalyst for the hydroboration of functional alkenes in the presence of pinacolborane at room temperature. Notably, UV irradiation (350 nm) is important to promote this catalytic transformation. Interestingly, high chemo‐ and regioselectivities were observed as only anti‐Markovnikov boronate derivatives were obtained and various functional