An Olefinic 1,2‐Boryl‐Migration Enabled by Radical Addition: Construction of
<i>gem</i>
‐Bis(boryl)alkanes
作者:Binlin Zhao、Zexian Li、Yixiao Wu、Yandong Wang、Jiasheng Qian、Yu Yuan、Zhuangzhi Shi
DOI:10.1002/anie.201903721
日期:2019.7.8
(commercially available or prepared from alkenyl bromides and Mg) with B2Pin2 (bis(pinacolato)diboron) react with diverse alkyl halides by a Ru photocatalyst to give various gem‐bis(boryl)alkanes. Alkyl radicals add efficiently to the alkenyl diboronate complexes, and the adduct radicalanions undergo radical‐polar crossover, specifically, a 1,2‐boryl‐anion shift from boron to the α‐carbon sp2 center.
The regio- and stereoselectivesynthesis of allylsilane derivatives bearing a tetrasubstituted olefin was achieved using 2,2-diborylethylsilane as a key intermediate. The regioselective deprotonati...