An expedient synthesis of 3-arylmethylbutenolides from α-methylene-γ-butyrolactones: a useful synthetic application of palladium-catalyzed chelation-controlled oxidative arylation protocol
摘要:
A palladium-catalyzed chelation-controlled oxidative arylation of alpha-methylene-gamma-butyrolactones with arenes provided 3-arylmethylbutenolides as major products along with a low yield of alpha-arylidene-gamma-butyrolactones. The selectivity might be due to a chelation between the palladium center and a directing group at the gamma-position of alpha-methylene-gamma-butyrolactones. (C) 2012 Elsevier Ltd. All rights reserved.