Catalytic oxidative cyclization of α-carbonyl-γ-alkynyl sulfoxonium ylides for stereospecific synthesis of (1Z,3Z)-1,3-bismethyleneisobenzofurans

A new copper( ii )-catalyzed reaction of α-carbonyl-γ-alkynyl sulfoxonium ylides with sulfonyl hydrazides in the presence of tert -butyl hydroperoxide (TBHP) is reported, regio- and stereoselectively accessing (1 Z ,3 Z )-1,3-bismethyleneisobenzofurans.