A One-Pot Isomerization−Arylation of 2,3-Epoxycyclohexanone under Controlled Microwave Heating
作者:Andreas Svennebring、Neeraj Garg、Peter Nilsson、Anders Hallberg、Mats Larhed
DOI:10.1021/jo0504619
日期:2005.6.1
method has been developed for the direct preparation of 3-aryl-1,2-cyclohexanediones from 2,3-epoxycyclohexanone via a microwave-assisted tandem epoxy ketone isomerization−Heck arylation reaction. The preparative microwave-assisted reactions were performed preferentially in 50% aqueous poly(ethylene glycol) utilizing sodium acetate as the base. Within 5−30 min of directed microwave heating, employing less
已经开发了一种快速的一锅法,可通过微波辅助串联环氧酮异构化-Heck芳基化反应从2,3-环氧环己酮直接制备3-芳基-1,2-环己二酮。制备微波辅助反应优选在乙酸钠为碱的50%聚乙二醇水溶液中进行。在直接微波加热的5-30分钟内,使用少于0.05 mol%的乙酸钯且没有膦配体,在整个环境友好的过程中,分离出高达72%的C3-芳基二酮收率。基于所提出的中间体的化学反应性,提出了一种反应途径,其中乙酸盐碱促进了2,3-环氧环己酮的重排成1,2-环己二酮的活性单烯醇形式。