Sodium hydride → 2-(2-Bromo-5-nitrophenyl)-4-[[2'-(N-t-butylsulfamoyl)-3-fluorobiphenyl-4-yl]methyl]-2,4-dihydro-5-ethyl-3H-1,2,4-triazol-3-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 2.00 g (6.39 mmol) of 2-(2-bromo-5-nitrophenyl)-2,4-dihydro -5-ethyl-3H-1,2,4-triazol-3-one (from Step B) and 184 mg (7.67 mmol) of sodium hydride in 7 mL of DMF was stirred at 50° C. for 3 hours. A solution of 4'-(bromomethyl)-N-t-butyl-3'-fluoro -2-biphenylsulfonamide (from Step F dissolved in 6 ml of DMF was then added and the resulting mixture was stirred at 50° C. for another 3 hours. The reaction mixture was quenched by addition of water followed by extractions with EtOAc, CH2Cl2, and MeOH. Water was removed and the organic layers were washed with brine, and dried over anhydrous Na2SO4. The entire crude product mixture thus obtained was flash chromatographed over silica gel (gradient elution using 0.5-2.0% MeOH in CH2Cl2) to afford 3.54 g (88%) of the title compound as a yellow solid (contaminated with some upper and lower Rf impurities by TLC but suitable for use in the next step without further purification), mp 223°-225° C.; mass spectrum (FAB) m/e 631, 633 (M+1)+.

Provenance & Evidence