Rearrangement Products of α-Salicylidene-γ-thiobutyrolactones

Article abstract of DOI:10.1021/jo00336a025

A convenient means of condensing various salicylaldehydes with γ-thiobutyrolactone has been found.The condensation, which is accompanied by a rearrangement, yields either a product of Michael-additive cyclization (a 2,3,3a,9b-tetrahydrothieno<3,2-c>coumarin) or one of oxidation (the disulfide of a 3-(2-mercaptoethyl)coumarin).