Synthesis of Indeno[1′,2′:4,5]imidazo[1,2-<i>a</i>]pyridin-11-ones and Chromeno[4′,3′:4,5]imidazo[1,2-<i>a</i>]pyridin-6-ones through Palladium-Catalyzed Cascade Reactions of 2-(2-Bromophenyl)imidazo[1,2-<i>a</i>]pyridines
作者:Ju Zhang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.6b00166
日期:2016.4.15
and efficient synthesis of 11H-indeno[1′,2′:4,5]imidazo[1,2-a]pyridin-11-one, a hybrid structure of indenone with imidazo[1,2-a]pyridine, from the reaction of 2-(2-bromophenyl)imidazo[1,2-a]pyridine with carbon monoxide through palladium-catalyzed CO insertion and C–H bond activation, has been developed. Intriguingly, under similar conditions but in the presence of Cu(OAc)2, the reaction selectively
新型高效合成11 H-茚并[1',2':4,5]咪唑并[1,2 - a ]吡啶-11-酮,茚满酮与咪唑并[1,2- a ]吡啶的杂化结构通过2-(2-溴苯基)咪唑并[1,2- a ]吡啶与一氧化碳的反应,通过钯催化的CO插入和CH键的活化,已经得到了发展。有趣的是,在相似的条件下但在Cu(OAc)2的存在下,反应选择性地提供了6 H -chromeno [4',3':4,5]咪唑并[1,2 - a ]吡啶-6-one,a色酮与咪唑[1,2- a]的杂化结构吡啶,通过更复杂的级联过程,包括乙酰氧基化,脱乙酰化,CO插入和C–H键激活。