A versatile combined N-heterocyclic carbene and base-catalyzed multiple cascade approach for the synthesis of functionalized benzofuran-3-(2H)-ones
作者:Johannes F. Franz、Patrick J.W. Fuchs、Kirsten Zeitler
DOI:10.1016/j.tetlet.2011.10.078
日期:2011.12
benzofuran-3-(2H)-ones have been synthesized from simple aldehyde building blocks in a combined NHC- and base-catalyzed one-pot cascade reaction in moderate to excellent yields. This modular approach comprises a NHC-catalyzed hydroacylation/Stetter reaction sequence followed by a retro-Michael, 1,3-H shift and oxa-Michael cascade rearrangement promoted by strong bases.
功能化的2,2-二取代的苯并呋喃-3-(2 H)-是在NHC和碱催化的一锅级联反应中,由简单的醛结构单元合成的,产率中等至优异。这种模块化的方法包括NHC催化的加氢酰化/ Stetter反应序列,然后由强碱促进的Michael逆向,1,3-H移位和Ox-Michael级联重排。