Methanesulfonyl chloride → N'-t-butyl-N-(5-bromonicotinoyl)-N'-(4-chlorobenzoyl)hydrazine

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A solution of N'-t-butyl-N'-(4-chlorobenzoyl)hydrazine (0.5 g, 0.0022 mol) and 5-bromonicotinic acid (0.44 g, 0.0022 mol) in 10 ml of methylene chloride containing triethylamine (0.33 g) was added to a solution of methanesulfonyl chloride (0.25 g, 0.0022 mol) in 10 ml of methylene chloride at 0° C. The resulting mixture was stirred at 23° C. for 2 hours and then was allowed to stand overnight at 23° C. Aqueous sodium bicarbonate was added and the layers were separated. The aqueous layer was re-extracted with methylene chloride. The organic extracts were evaporated to give a yellow solid which was triturated with hexane/methylene chloride to afford N'-t-butyl-N-(5-bromonicotinoyl)-N'-(4-chlorobenzoyl)hydrazine as an off-white solid: m.p. 193°-197° C.

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