Studies on sulphur heterocycles. Reactions of 6, 7??dihydrobenzo [b] thiophen??4 (5H) one derivatives and their conversion to 7??substituted thieno [2, 3??h][1] …

CM Asprou, JSA Brunskill, H Jeffrey…

Index: Asprou, Chris M.; Brunskill, John S. A.; Jeffrey, Howard; De, Asish Journal of Heterocyclic Chemistry, 1980 , vol. 17, # 1 p. 87 - 92

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Citation Number: 14

Abstract

Abstract Cyclization of γ-(2-thienyl) butryic acid with acid anhydrides gives 2-acyl derivatives as well as the expected 6, 7-dihydrobenzo [b] thiophen-4 (5H) one. Several reactions of these ketones have been studied including their conversion to 0, 0-diethyl thiophosphonohydrazones. 7-Substituted thieno [2, 3-h][1] benzopyran-8-ones have been prepared via 4-hydroxybenzo [b] thiophen-5-carbaldehydes.