Propyl chloroformate → (3-{3-Butyl-4-[2''-(2-chloro-benzoylsulfamoyl)-biphenyl-4-ylmethyl]-5-oxo-4,5-dihydro-[1,2,4]triazol-1-yl}-4-chloro-phenyl)-carbamic acid propyl ester

Beteiligte Stoffe

Reaktionsschritte

At room temperature, under N2, a solution of 20 mg (0.031 mmole) of 2-(5-amino-2-chlorophenyl)-5-n-butyl-4-[[2'-[N-(2-chlorobenzoyl)sulfamoyl]biphenyl-4-yl]methyl]-2,4-dihydro-3H-1,2,4-triazol-3-one (from Example 60), 3.8 mg (0.031 mmole) of DMAP, 18.9 mg (0.154 mmole) of propyl chloroformate, and 1 mL pyridine was stirred overnight. After quenching with methanol and water, the organic material was extracted with EtOAc, washed with water and brine, and dried over sodium sulfate. The crude product obtained after filtration and removal of volatiles was flash chromatographed over silica gel (gradient elution with 0.5-5% MeOH/CH2Cl2) to give 15 mg (65%) of the desired compound as a white solid, mp >119° C. (gradual), homogeneous by TLC (9:1 MeOH/CH2Cl2), mass spectrum (FAB) m/e 736 (M+1)+.

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