HOAc-Mediated Domino Diels–Alder Reaction forSynthesis of Spirocyclohexane-13′-indolinesin Ionic Liquid BmimBr

摘要

An efficient and diastereoselective synthetic protocol for the construction of spiro[cyclohexane-1,3′-indolin]-3-en-2′-ones and spiro[cyclohexane-1,2′-inden]-3-ene-1′,3′-diones was provided by HOAc-mediated domino reaction of pinacoles with typical dienophiles, such as 3-methyleneoxindolines and 2-arylideneindane-1,3-diones, in ionic liquid [Bmim]Br. This domino reaction involved the in situ generation of 1,3-dienes from acid-mediated dehydration of various pinacoles and the sequential Diels–Alder reaction.