Feeding the Heck Reaction with Alcohol: One-Pot Synthesis of Stilbenes from Aryl Alcohols and Bromides
作者:Paul Colbon、Jonathan H. Barnard、Mark Purdie、Keith Mulholland、Ivan Kozhevnikov、Jianliang Xiao
DOI:10.1002/adsc.201200340
日期:2012.5.21
Aryl alcohols are employed as feedstock for the Heck reaction. Keggin‐type heteropolyacids catalyse the selective dehydration of the alcohols to styrenes, which, in one‐pot, undergo palladium‐catalysed Heck arylation with aryl bromides, affording broadly functionalised stilbenes. The choice of solvent is critical for the cascade dehydration–Heck reaction, with electron‐rich aryl alcohols preferring
芳醇用作Heck反应的原料。Keggin型杂多酸催化将醇选择性脱水为苯乙烯,然后将其单锅中与芳基溴化物进行钯催化的Heck芳基化反应,从而提供功能广泛的对苯二甲酸酯。溶剂的选择对于级联脱水-Heck反应至关重要,富电子芳基醇优先选择碱性介质,而缺电子的芳基醇则要求碱性较低的溶剂。