An efficient nickel-catalyzed alkenylation of functionalized benzylic halides with alkenylaluminum reagents
作者:Deepak B. Biradar、Han-Mou Gau
DOI:10.1039/c2ob25303h
日期:——
Highly efficient and simple coupling reactions of benzylic bromides or chlorides with alkenylaluminum reagents catalyzed by NiCl2(PPh3)2 are reported. The coupling reactions proceed effectively at room temperature employing low loading of catalyst, 0.5 mol% for benzylic bromides having either electron-donating or -withdrawing substituents on the aromatic ring, affording coupling products in excellent yields of up to 94% in short reaction times. The coupling reactions of benzylic chloride require 5 mol% of the catalyst and a longer reaction time of 2 h.
报道了由NiCl2(PPh3)2催化的苄基溴或氯与烯基铝试剂的高效简单耦合反应。这些耦合反应在室温下通过使用低负载的催化剂有效进行,对于具有供电子或吸电子取代基的芳环上的苄基溴,催化剂负载量为0.5 mol%,在短时间内以高达94%的优异产率得到耦合产物。苄基氯的耦合反应需要5 mol%的催化剂和2小时的较长反应时间。