S. A. Shipilovskikh, A. Rubtsov, V. V. Zalesov
Sep 23, 2009
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0
Influential Citations
26
Citations
Journal
Chemistry of Heterocyclic Compounds
Abstract
(Z)-4-Aryl-2-[3-(ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo[b]thiophen-2-ylamino]-4-oxobuten-2-oic acids, which exist in the enamino keto form in solutions, were synthesized by the action of ethyl 2-amino-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate on 4-aryl-2-hydroxy-4-oxobuten-2-oic acids. Under the influence of acetic anhydride the obtained acids undergo cyclization to ethyl 2-(5-aryl-2-oxofuran-3(2H)-ylideneamino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylates.