Hydrochloric Acid → 7-(4-Methoxyphenyl)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylic acid

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Reaction Steps

To a solution of methyl 7-(4-methoxyphenyl)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylate (463 mg) in 1,2-dimethoxyethane (30 ml) was added 6N hydrochloric acid (30 ml), and the mixture was refluxed for 18 hours and concentrated under reduced pressure to give crystals, which were collected by filtration. The crystals washed with 2-propanol and hexane to give pale yellow crystals of 7-(4-methoxyphenyl)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylic acid (384 mg).

Provenance & Evidence