Ring-Opening/Annulation Reaction of Cyclopropyl Ethanols: Concise Access to Thiophene Aldehydes via C–S bond formation

Synthesis of thiophene aldehydes from easily available cyclopropyl ethanol derivatives and potassium sulfide has been developed. This novel one-pot procedure achieves double C-S bonds formation via cleavage of C-C bonds. The transformation has good functional group tolerance under mild reaction conditions. Moreover, the DMSO plays as the solvent and mild oxidant simultaneously in this reaction.