Triethylamine → 1-[1-(2-toluoylmethyl)-2-oxo-5-(3-methyl-2-butenyl)-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-3-yl]-3-(3-ethoxycarbonylphenyl)urea

Participants

Reaction Steps

Ethyl 3-aminobenzoate (221 mg) was dissolved in tetrahydrofuran (20 ml), under ice-cooling triphosgene (134 mg) was added, triethylamine (115 μl) was added thereto five times every 3 minutes,a solution of 1-(2-toluoylmethyl)-2-oxo-3-amino-5-(3-methyl-2-butenyl)-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine (477 mg) in tetrahydrofuran (20 ml) was added dropwise thereto, and the mixture was stirred for 30 minutes at same temperature and subsequently stirred overnight at room temperature. The reaction mixture was concentrated under reduced pressure, water (50 ml) was added, and extracted with methylene chloride. The organic layer was washed with saturated aqueous sodium bicarbonate, dried over anhydrous sodium sulfate, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography(chloroform:ethyl acetate=10:1), to thereby obtain 316 mg of the titled compound.

Provenance & Evidence