First electricity-promoted, catalyst-free cascade thia-Michael addition and thioacetalization of cyclic enones with thiols are described. The electro-organic protocol was found suitable for both the alkyl as well as aryl thiols as they reacted with a variety of cyclic enones to afford the corresponding tris-sulfane in good to excellent yields. Based on control experiments, it was found that this cascade reaction is chemo-selective involving first thia-Michael addition followed by thioacetalization process.
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