Ethyl Acetate → 2-[5-Amino-2-(trifluoromethyl)phenyl]-5-n-butyl-4-[[2'-(N-t-butylsulfamoyl)biphenyl-4-yl]methyl]-2,4-dihydro-3H-1,2,4-triazol-3-one

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A mixture of 200 mg (0.317 mmole) of 5-n-butyl-4-[[2'-(N-t-butylsulfamoyl)biphenyl-4-yl]methyl]-2,4-dihydro-2-[5-nitro-2-(trifluoromethyl)phenyl] -3H-1,2,4-triazol-3-one (from Step C), 15 mg of platinum oxide, 10 mL of ethyl acetate, and 2 mL of ethanol was shaken with hydrogen at approximately 4 atm for a few hours until complete and then centrifuged. The supernatant was decanted off, and the catalyst pellet was extracted 3× with ethanol in the same manner. The combined supernatant fractions were concentrated to give 190 mg (100%) of the title compound as a brown foam, which was suitable for use without further purification; TLC in 95:5 CH2Cl2 --MeOH; mass spectrum (FAB) m/e 608 (M+Li)+.

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