Propionyl bromide → HCID 19939418, 화합물

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By the procedure of Example 69, 2-(5-amino-2-chlorophenyl)-5-n-butyl-4-[[2'-[N-(2-chlorobenzoyl)sulfamoyl]-5'-ethylbiphenyl-4-yl]methyl]-2,4-dihydro-3H-1,2,4-triazol-3-one (from Step D) was reacted with propionyl bromide in the presence of DMAP. Purification of the crude product by flash chromatography on silica gel (gradient elution with 1-4% MeOH in CH2Cl2) afforded a 65% yield of the title compound as a cream-colored solid, mp 144°-146° C.; homogeneous by TLC in 9:1 CH2Cl2 --MeOH; m/e 734 (M+1)+.

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