Methanol → HCID 12876536, compound

Participants

Reaction Steps

A mixture of 50 mg of (5,6-dihydro-6-oxo benzo[b]pyrido-[3,2-f]thiepin-8-yl)-acetamide, 200 mg of potassium hydroxide, 2 ml of water and 15 ml of methanol was refluxed under a nitrogen atmosphere for 4 hours. After the completion of the reaction, the solvent was distilled off to obtain a residue, to which was added ice water. The mixture was acidified with acetic acid and extracted with chloroform. The extract was washed with water and dried over anhydrous sodium sulfate. The solvent was removed by distillation to obtain an oil, which was chromatographed over silica gel and eluted with chloroform/ethanol (200/1) to obtain a solid. This solid was recrystallized from ethanol to give 15 mg (yield: 30%) of (5,6-dihydro-6-oxo benzo[b]pyrido[3,2-f]thiepin-8-yl)-acetic acid as colorless needle crystals having a melting point of 212°-213.5° C.

Provenance & Evidence