One-Pot Synthesis of 2,3-Disubstituted Naphtho[2,3-b]thiophene-4,9diones from a 2-Sulfenyl-1,4-naphthoquinone and Enamines.-Title compounds like (V) and (VII) are synthesized in one-pot using a tandem conjugate addition-cyclization sequence between reactant (III) and enamines. A possible mechanism is proposed. -(KOBAYASHI, KAZUHIRO; FURUTA,
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