BCl<sub>3</sub>
-Induced Annulative Oxo- and Thioboration for the Formation of C3-Borylated Benzofurans and Benzothiophenes
作者:Andrew J. Warner、Anna Churn、John S. McGough、Michael J. Ingleson
DOI:10.1002/anie.201610014
日期:2017.1.2
form synthetically ubiquitous pinacol boronate esters or used in situ in Suzuki-Miyaura cross couplings to generate 2,3-disubstituted heteroarenes from simple alkyne precursors in one pot. In a number of cases alkyne trans-haloboration occurs alongside, or instead of, borylative cyclization and the factors controlling the reaction outcome are determined.
BCl3诱导的具有邻-EMe(E = S,O)基团的芳基炔烃的硼化环化反应是形成C3硼化苯并噻吩和苯并呋喃的一种简单,无金属的方法。可以保护二氯(杂芳基)硼烷一级产物形成合成上普遍存在的频哪醇硼酸酯,或在Suzuki-Miyaura交叉偶合中原位使用,以在一个罐中从简单炔烃前体生成2,3-二取代杂芳烃。在许多情况下,炔烃转卤代反应与硼化环化同时发生,或代替其进行,并确定了控制反应结果的因素。