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

Participants

Reaction Steps

1-[1-(2-Toluoylmethyl)-2-oxo-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-3-yl]-3-(3-ethoxycarbonylphenyl)urea (500 mg) obtained from Step 1 of Example 93 was suspended in 1,2-dichloroethane (10 ml), chloropivaloyl chloride (166 mg) and pyridine (86 μl) were added, and the mixture was refluxed for 2 hours 30 minutes. The reaction mixture was successively washed with water,1N hydrochloric acid, and saturated aqueous sodium bicarbonate, 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 509 mg of the titled compound (Yield: 81%).

Provenance & Evidence