<i>B</i>-Alkylcatecholboranes as a Source of Radicals for Efficient Conjugate Additions and Allylations
作者:Philippe Renaud、Arnaud-Pierre Schaffner、Barbara Becattini、Cyril Ollivier、Valéry Weber
DOI:10.1055/s-2003-42430
日期:——
B-Alkylcatecholboranes, easily prepared in situ by hydroboration of alkenes, are powerful radical precursors that can be used for carbon-carbon bond formation. Typical procedures for (a) conjugate addition to enones, (b) conjugate addition to activated alkenes such as vinyl sulfones, and (c) direct allylation are described. Experimentally, these three one-pot reactions are easy to perform. No slow
B-烷基儿茶酚硼烷很容易通过烯烃的硼氢化原位制备,是强大的自由基前体,可用于碳-碳键的形成。描述了 (a) 与烯酮共轭加成、(b) 与乙烯基砜等活化烯烃共轭加成和 (c) 直接烯丙基化的典型程序。实验上,这三个一锅法反应很容易进行。不需要缓慢添加试剂,这是分子间自由基添加中经常遇到的过程。