Water → HCID 12687090, compound

Participants

Reaction Steps

To 1.0 g of sodium hydroxide dissolved in 15 ml of diethylene glycol was added 1.0 g of 9-cyano-3-fluoro-10,11-dihydrodibenzo-[b,f]thiepin-11-one hydrazone and the resulting mixture was heated with stirring at 190°-200° C. for 2 hours. After cooling, water was added to the mixture, which was extracted with benzene. The aqueous layer was acidified with hydrochloric acid and extracted with ethyl acetate. The extract was washed with water and dried over anhydrous sodium sulfate. The solvent was evaporated to obtain the residue, which was chromatographed over silica gel, and eluted with ethyl acetate-benzene (1:10), and there was obtained the crude product. Recrystallization from methanol afforded 102 mg of 9-carboxy-3-fluoro-10,11-dihydrodibenzo[b,f]thiepin having a melting point of 209°-211° C.

Provenance & Evidence