Formic Acid → 1-(4-Formylaminopheny1)-3-formyl-4-methyl-7,8-methylenedioxy-3,4-dihydro-5H-2,3-benzodiazepine

Participants

Reaction Conditions

Reaction Steps

To 6.0 ml (0.104 mol) of acetic anhydride 3.0 ml (0.08 mol) of 100% formic acid were added dropwise at 0° C. during 5 minutes while constant stirring. The stirring was continued at 50° C. for 15 minutes. Thereafter 1 g (3.3 mmol) of 1-(4-aminophenyl)-4-methyl-7,8-methylenedioxy-3,4-dihydro-5H-2,3-benzodiazepine was added to the thus-prepared mixed anhydride. The reaction mixture was stirred at 25° C. for 1.5 hours, then poured into ice-water, the precipitate formed was filtered, washed with 4×5 ml of distilled water and dried at 80° C. to give 0.80 g of raw product. After crystallization from 3 ml of ethyl acetate 0.65 g (56.2%) of the aimed product was obtained, m.p.: 193°-195° C.

Provenance & Evidence