Tetrahydrofuran → 3-[3-[1-(2-toluoylmethyl)-2-oxo-5-(3-methyl-2-butenoyl)-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-3-yl]ureido]benzoic acid

Participants

Reaction Steps

1-[1-(2-Toluoylmethyl)-2-oxo-5-(3-methyl-2-butenoyl)-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-3-yl]-3-(3-ethoxycarbonylphenyl)urea (340 mg) was dissolved in methanol (16 ml), aqueous lithium hydroxide monohydrate (120 mg) solution (8 ml) and tetrahydrofuran (8 ml) were added, and the mixture was refluxed for 50 minutes. The reaction mixture was concentrated under reduced pressure, the residue was dissolved in water (150 ml), the solution was washed with diethyl ether, acidified with 1N hydrochloric acid, and extracted with methylene chloride. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, the solvent was evaporated under reduced pressure, and diisoproryl ether was added to the residue for trituration, collected by filtration, to thereby obtain 223 mg of the titled compound (Yield: 68.8%).

Provenance & Evidence