1-Hydroxybenzotriazole → 1-tert-butylcarbonylmethyl-2-oxo-3-[(2S)-(2-tert-butoxycarbonylamino-3-phenylpropionyl)amino]-5-phenyl-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine

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Reaction Steps

Under argon atmosphere, 1-tert-butylcarbonylmethyl-2-oxo-3-amino-5-phenyl-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine (4.75 g) obtained from Step 2 of Example 95 was dissolved in anhydrous N,N-dimethylformamide (40 ml), N-tert-butoxycarbonyl-L-phenylalanine (3.80 g), 1-hydroxybenzotriazole (1.93 g), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (2.74 g) and triethylamine (3.65 ml) were added under ice-cooling, the mixture was stirred for 5 minutes at same temperature, and subsequently the resultant mixture was allowed to come to room temperature, stirred for 2 hours. Ice-water was added to the reaction mixture, extracted with ethyl acetate, the organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, the residue was purified by silica gel column chromatography(n-hexane:ethyl acetate=2:1), to thereby obtain 8.06 g of the titled compound (Yield: 100%).

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