One-Pot Synthesis of 2,3-Disubstituted Naphtho[2,3-b]thiophene-4,9-diones from a 2-Sulfenyl-1,4-naphthoquinone and Enamines

The title naphthothiophenequinone derivatives were generally synthesized in one-pot using a tandem conjugate addition–cyclization sequence between 2-[2-(ethoxycarbonyl)ethyl]thio-1,4-naphthoquinone and enamines, derived from cyclic and acyclic ketones.

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