N-Heterocyclic Carbene-Catalyzed Formal [3+2] Annulation of Alkynyl Aldehydes with Nitrosobenzenes: A Highly Regioselective Umpolung Strategy
作者:Runfeng Han、Jing Qi、Jixiang Gu、Donghui Ma、Xingang Xie、Xuegong She
DOI:10.1021/cs400602v
日期:2013.12.6
N-Heterocycliccarbene-catalyzedformal [3+2] annulation of alkynyl aldehydes and nitrosobenzenes has been reported. This transformation provided the novel C–X bond formation under mild conditions in moderate to satisfactory yields. The catalytic protocol allows for a rapid construction of 2,5-disubstituted isoxazol-3(2H)-ones and 2,3-disubstituted isoxazol-5(2H)-ones from the same materials via a
N-Heterocyclic Carbene Catalyzed Cyclization Cascades of 3-Halopropenals and Arylnitroso Compounds to 2,3-Disubstituted Isoxazol-5(2H)-ones
作者:Cheng Ma、Weijun Yao、Ming Bian、Gang Wang
DOI:10.1055/s-0030-1260037
日期:2011.6
An NHC-catalyzed annulation reaction of 3-halopropenals with nitrosobenzene derivatives, providing access to 2,3-disubstituted isoxazol-5(2H)-ones under mild conditions is described. This procedure represents a metal-free approach to the alternative equivalent of β-acylvinyl anions for the formation of heterocyclic compounds.