ChemInform Abstract: Facile Regioselective Synthesis of Benzofuran‐Annulated Six‐Membered Sulfur Heterocycles and the Occurrence of Thermal [1,3] Sigmatropic Rearrangement.

Abstract Phase transfer catalyzed alkylation of benzofuranthione (I) with propargyl halides affords the corresponding S‐alkyl derivatives, which undergo thio‐Claisen rearrangement under mild conditions to give hitherto unreported sulfur heterocycles [cf.