Palladium-Catalyzed Dehydrative Heck Olefination of Secondary Aryl Alcohols in Ionic Liquids: Towards a Waste-Free Strategy for Tandem Synthesis of Stilbenoids
作者:Rakesh Kumar、Amit Shard、Richa Bharti、Yogesh Thopate、Arun Kumar Sinha
DOI:10.1002/anie.201107261
日期:2012.3.12
All in one: A tandem strategy has been developed wherein secondary aryl alcohols are directly coupled with aryl halides to provide stilbenoids through a dehydrative Heck sequence in the ionic liquid [hmim]Br, and with water as a by‐product under microwave irradiation (see scheme). Classical methods do not permit this sequence to proceed in one pot, and some methods require multiple steps. hmim=1‐n
总而言之:已开发了一种串联策略,其中仲芳基醇直接与芳基卤化物偶合,以通过离子液体[hmim] Br中的脱水Heck序列提供二苯乙烯类化合物,并在微波辐射下与水作为副产物(参见方案)。经典方法不允许此序列在一个锅中进行,并且某些方法需要多个步骤。hmim = 1 - n-己基-3-甲基咪唑鎓。