[GRAPHICS]The addition of Bu(4)Nl has been found to accelerate the palladium(0)-catalyzed cross-coupling between benzylic zinc bromides and aryl or alkenyl triflates. Remarkably, it further allows a new nickel(0)-catalyzed cross-coupling between functionalized benzylic zinc reagents and primary alkyl iodides leading to polyfunctional products in good yields under mild reaction conditions (0-20 degrees C, 4-16 h).
Efficient, Regioselective Palladium-Catalyzed Tandem Heck-Isomerization Reaction of Aryl Bromides and Non-Allylic Benzyl Alcohols
作者:Matthew L. Crawley、Kristin M. Phipps、Igor Goljer、John F. Mehlmann、Joseph T. Lundquist、John W. Ullrich、Cuijian Yang、Paige E. Mahaney
DOI:10.1021/ol900036y
日期:2009.3.5
An efficient and mild method to couple arylbromides and activated non-allylic alcohols in a Heckreaction with tandem isomerization to selectively afford high yields of 1,5-diarylalkan-1-ones has been developed. Mechanistic insight was gained through NMR studies of products derived from deuterium-labeled intermediates.