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

Participants

Reaction Steps

Ethyl 3-aminobenzoate (252 mg) was dissolved in tetrahydrofuran (40 ml), triphosgene (152 mg) was added under ice-cooling, subsequently, triethylamine (132 μl) was added five times every 3 minutes, a solution of 1-(2-toluoylmethyl)-2-oxo-3-amino-5-cyclohexylcarbonyl-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine (600 mg) in tetrahydrofuran (20 ml), and the reaction mixture was allowed to come to room temperature and additionally stirred for 2 hours. The reaction mixture was concentrated under reduced pressure, water (50 ml) was added to the residue, extracted with methylene chloride. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography(n-hexane:ethyl acetate=2:1), to thereby obtain 500 mg of the titled compound.

Provenance & Evidence