Iodine-induced cyclization of γ,δ-unsaturatedsecondarythioamides 1 proceeded regio- (5-exo-trigonal) and chemo- (sulfur-carbon bond formation) selectively, providing iminothiolactones 2, which were converted in two-step sequences (dehydroiodination and N-acetylation) into 2-acetoamidothiophenes 4. This procedure was performed in one flask to afford polysubstituted 2-aminothiophenes.