Ethanol → HCID 19363278, compound

Participants

Reaction Steps

Ethyl {(4-Methoxy-2-nitro-3-pentyloxybenzoyl)-[2-(4-nitrophenyl)-ethyl]amino}acetate (70.0 mg, 0.135 mmol) and ethanol (2 ml) were mixed, and 10% palladium-carbon catalyst was added. The reaction mixture was stirred in a stream of hydrogen at room temperature for 10.5 hours, and then filtered. The filtrate was concentrated under reduced pressure. Toluene (10 ml) and p-toluene sulfonate monohydrate (1 mg, 0.0053 mmol) were added to the precipitated crude crystals, and the mixture was refluxed under heating for 3.5 hours. Ethyl acetate (20 ml) was added to this reaction mixture, and the organic layer was washed with saturated aqueous sodium hydrogencarbonate solution (5 ml) and saturated brine (5 ml) and dried over anhydrous magnesium sulfate. The drying agent was filtered off and the filtrate was concentrated under reduced pressure. The obtained residue was purified by column chromatography on silica gel (chloroform/methanol=10/1) to give 4-[2-(4-aminophenyl)ethyl]-8-methoxy-9-pentyloxy-3,4-dihydro-1H-benzo[e][1,4]diazepine-2,5-dione (35 mg, 63% in 2 steps) as colorless crystals.

Provenance & Evidence