Triethylamine → 1-(1-tert-butylcarbonylmethyl-2-oxo-5-phenyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-3-yl)-3-(3-benzyloxycarbonylphenyl)urea

Participants

Reaction Conditions

Reaction Steps

Diphenylphosphoryl azide (1.1 g) and triethylamine (0.62 ml) were added to a solution of isophthalic acid mono-benzyl ester (792 mg) in dioxane (20 ml), the mixture was stirred internal temperature at 60° C. for 20 minutes and internal temperature at 80° C. for 2 hours. After the reaction mixture was allowed to cool to room temperature, a solution of 1-tert-butylcarbonylmethyl-2-oxo-3-amino-5-phenyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine (723 mg) obtained from Step 1 of Example 33 in dioxane (5 ml) was added to the reaction mixture. The reaction mixture was stirred at room temperature for 30 minutes. The mixture was concentrated under reduced pressure, chloroform (50 ml) was added to the resultant residue, and washed with saturated aqueous sodium bicarbonate. After dried over anhydrous sodium sulfate, the solvent was evaporated under reduced pressure, the mixed solvent of isopropyl ether and ethyl acetate was added to the residue for trituration, to thereby obtain 674 mg of the title compound as a colorless solid (Yield: 54%).

Provenance & Evidence