ABSTRACT p-TsOH-mediated the direct α-substitution of cyclic Morita–Baylis–Hillman alcohols with aliphatic and aromatic thiols in refluxing THF. The reaction proceeded with complete α-regioselectivity and provided the corresponding allyl sulfides in moderate to good yields. GRAPHICAL ABSTRACT
An efficient and mild S-allylation of thiols with cyclic Baylis-Hillman acetates with no need of a transition-metal-catalyst or an expensive additive is described. Allyl sulfides are prepared in good to excellent yields (60-97%) and a single regioisomer was observed in all cases.[GRAPHICS].