Concise Route to 4,5-Dioxo-4,5-dihydronaphtho[1,2-b]thiophene-2-carboxylates
摘要:
Reactions of 3-acyl-1,2-naphthoquinones with ethyl mercaptoacetate followed by protection of the resulting hydroxyl groups and thiophene ring formation using I-trimethylsilylimidazole, deprotection with hydrochloric acid, and oxidation with cerium(IV) ammonium nitrate (CAN) gave, in one-pot, the title thienonaphthoquinone derivatives in moderate to good yields.