Dimethylcarbamoyl Chloride → 1-[(6-Chloronaphthalen-2-yl)sulfonyl]-4-[4-(2-cyanopyridin-4-yl)benzoyl]piperazine

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Reaction Steps

In dichloromethane (100 ml), 4-[4-[[4-[(6-chloronaphthalen-2-yl)sulfonyl]piperazin-1-yl]carbonyl]phenyl]pyridine N-oxide (1.67 g) was dissolved, followed by the addition of trimethylsilycynanide (0.42 ml) and dimethylcarbamoyl chloride (0.30 ml). The resulting mixture was stirred at room temperature for 24 hours. An aqueous solution of sodium bicarbonate and dichloromethane were added to the reaction mixture to separate the organic layer. The organic layer thus obtained was dried over anhydrous sodium sulfate. The residue obtained by distilling off the solvent under reduced pressure was purified by chromatography on a silica gel column (1% methanol—dichloromethane), whereby the title compound (1.44 g, 84%) was obtained.

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