Brønsted Base‐Mediated Regio‐ and Stereoselective
<i>trans‐</i>
Silaboration of Propargylamides: Access to 1,2‐Vinylborasilanes
作者:Russell Fritzemeier、Webster L. Santos
DOI:10.1002/chem.201703774
日期:2017.11.2
A facile method for the preparation of β‐boryl‐α‐silyl aryl acrylamides using phenyllithium, dimethylphenylsilylpinacolborane, and propargylamides is reported. A key feature of this transition metal‐free reaction is the Brønsted base deprotonation of aryl secondary propargylamide to produce a Lewis base that activates the B−Si bond, which is followed by a sequential intramolecular α‐silylation‐trans‐β‐borylation
报道了一种使用苯基锂,二甲基苯基甲硅烷基萘烷硼烷和炔丙基酰胺制备β-硼基-α-甲硅烷基芳基丙烯酰胺的简便方法。该无过渡金属反应的关键特征是芳基仲炔丙基酰胺的布朗斯台德碱去质子化反应产生路易斯碱,该碱激活了B-Si键,随后依次进行分子内的α-甲硅烷基化-反式-β-硼化。反应以完全的区域和立体选择性进行。各种各样的N-和芳基取代的炔丙基酰胺可以高收率提供反式1,2-乙烯基硼硅烷。邻位硼硅烷产物经历各种随后的化学选择性转化。