Potassium Iodide → 3-[3-(1-tert-butoxycarbonylmethyl-2-oxo-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-3-yl)ureido]benzoic acid

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Reaction Steps

Preparation of 1-(1-tert-butoxycarbonylmethyl-2-oxo-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-3-yl)-3-(3-benzyloxycarbonylphenyl)urea Tert-butyl bromoacetate (503 mg), potassium iodide (23 ml), tetra n-butylammonium bromide (23 mg) and potassium carbonate (713 mg) were added to a solution of 1-(2-oxo-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-3-yl)-3-(3-benzyloxycarbonylphenyl)urea (800 mg) in dimethylsulfoxide (10 ml), the mixture was stirred at room temperature for one hour. Ice-water was added thereto, extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, the residue was purified by silica gel column chromatography (ethyl acetate:n-hexane=1:2), to thereby obtain 970 mg of the titled compound (Yield: 90%).

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