Synthesis of 5-Arylthio-3-hydroxyphthalates by the First [4+2] Cycloadditions of 3-Arylthio-1-silyloxy-1,3-butadienes with Dimethyl Acetylenedicarboxylate
A variety of 5-arylthio-3-hydroxyphthalates were prepared by [4+2] cycloadditions of 3-arylthio-1-trimethylsilyloxy-1,3-butadienes with dimethyl acetylenedicarboxylate.