Sodium Hydroxide → HCID 20338043, compound

Participants

Reaction Conditions

Reaction Steps

The mixture of 101 mg of 2-[4'-(α-cyanoethyl)-phenylthio]-3-pyridylacetic acid and 2 g of polyphosphoric acid was stirred at 150° C. for 65 minutes. After cooling, to this was added ice-water and the mixture was neutralized with conc. sodium hydroxide solution and 3% sodium hydroxide solution, then was made alkaline therewith. The resulting mixture was extracted with ethyl acetate and the extract was washed with 3% sodium hydroxide solution and dried over anhydrous sodium sulfate. The solvent was distilled off to obtain 36 mg of yellow glutinous substance, which was chromatographed over silica gel, eluted with n-hexane/acetone (2/1) and there was obtained 25 mg of 2-(5,6-dihydro-6-oxo benzo[b]pyrido[3,2-f]-thiepin-8-yl)-propionamide as colorless glutinous substance. This was solidified with ethanol to give crystals having a melting point of 175°-180° C. These were recrystallized from ethanol to give crystals having a melting point of 190°-192.5° C.

Provenance & Evidence