[C:1]1([CH3:14])[CH:6]=[C:5]([CH3:7])[CH:4]=[C:3]([CH3:8])[C:2]=1[S:9]([O:12][NH2:13])(=[O:11])=[O:10].[C:15](#[N:22])[C:16]1[CH:21]=[CH:20][N:19]=[CH:18][CH:17]=1.C(OCC)C>ClCCl>[CH3:8][C:3]1[CH:4]=[C:5]([CH3:7])[CH:6]=[C:1]([CH3:14])[C:2]=1[S:9]([O-:12])(=[O:11])=[O:10].[NH2:13][N+:19]1[CH:20]=[CH:21][C:16]([C:15]#[N:22])=[CH:17][CH:18]=1A solution of O-(mesitylsulfonyl)hydroxylamine (prepared as described in Synthesis, 1977, 1; 2.17 g, 10.1 mmol) in anhydrous dichloromethane (21 mL) was added dropwise to a stirred solution of isonicotinonitrile (1.05 g, 10.1 mmol) in anhydrous dichloromethane (10 mL) at 0° C. and the mixture was stirred at ambient temperature for 1 hour and 30 minutes. Diethyl ether was then added to the mixture and the precipitate that formed was collected by filtration, washed with diethyl ether and dried in vacuo to give the title compound (3.03 g, 94%) as a white solid.
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