NHC-Catalyzed Oxidative Cyclization Reactions of 2-Alkynylbenzaldehydes under Aerobic Conditions: Synthesis of O-Heterocycles
作者:Jong Hyub Park、Sachin V. Bhilare、So Won Youn
DOI:10.1021/ol200481u
日期:2011.5.6
An NHC-catalyzed, regio- and stereoselective oxidative cyclization of o-alkynylbenzaldehydes bearing an unactivated alkyne moiety as an internal electrophile has been developed to afford phthalides and isocoumarins. A single organocatalytic system enabled two sequential C−O bond formations to take place in an atom economical manner via highly efficient dual activation. Molecular oxygen in air could
已开发出具有NHC催化,带有未活化炔烃部分的邻炔基苯甲醛作为内部亲电子试剂的区域和立体选择性氧化环化反应,以提供邻苯二甲酸酯和异香豆素。单一的有机催化系统通过高效的双重活化,以原子经济的方式使两个连续的C-O键形成成为可能。在我们新开发的试剂系统下,空气中的分子氧可以用作氧原子的来源,用于将醛氧化为相应的苯甲酸。