Rhodium-Catalyzed [2+2+1+1] Cyclocarbonylative Coupling of Alkynes with Carbon Monoxide Affording Tetrasubstitutedp-Benzoquinones
作者:Qiufeng Huang、Ruimao Hua
DOI:10.1002/chem.200700839
日期:2007.10.5
In this strategy, the tetrasubstituted benzoquinones have been prepared directly by a [2+2+1+1] cyclocarbonylative coupling reaction of internal alkynes with CO in the presence of [RhCl(CO)2]2. The low concentration of CO in the reaction is the crucial point for the chemoselective formation of tetrasubstituted benzoquinones in good to high yields. Functional groups such as chloro, methoxy, cyano, vinyl
在这种策略中,四取代的苯醌是通过在[RhCl(CO)2] 2存在下内部炔烃与CO的[2 + 2 + 1 + 1]环羰基偶联反应直接制备的。反应中低浓度的CO是以良好或高收率化学选择性形成四取代苯醌的关键点。在反应条件下可耐受的官能团如氯,甲氧基,氰基,乙烯基,氟和羧酸根。