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Studies on Quinones. VII(1). Synthesis of Some Benzothiophene-4,7-diones
Ruiz, V. M.,Tapia, R.,Valderrama, J.,Vega, J. C.
, p. 1161 - 1164 (2007/10/02)
The synthesis of methyl 4,7-dihydro-4,7-dioxobenzothiophene-2-carboxylate (20) based on the reaction of methyl mercaptoacetate with activated 1,4-benzoquinones is described.Methyl 4,7-dihydro-4,7-dioxo-5-hydroxybenzothiophene-2-carboxylate (24) and its corresponding methyl ether 26 were obtained through a Thiele-Winter acetoxylation on 20.On the basis of the properties of methyl 4,7-dihydro-4,7-dioxo-6-methoxybenzothiophene-2-carboxylate (21) obtained from 2,4,5-trimethoxybenzaldehyde (32), the structures of the products 24 and 26 are proposed.
