[CH3:1][C:2]1[C:3]([NH2:8])=[N:4][CH:5]=[CH:6][CH:7]=1.[Br:9][CH2:10][CH2:11][C:12]1[CH:17]=[CH:16][C:15]([S:18](Cl)(=[O:20])=[O:19])=[CH:14][CH:13]=1.Cl>ClCCl>[Br:9][CH2:10][CH2:11][C:12]1[CH:13]=[CH:14][C:15]([S:18]([NH:8][C:3]2[C:2]([CH3:1])=[CH:7][CH:6]=[CH:5][N:4]=2)(=[O:20])=[O:19])=[CH:16][CH:17]=13-Methyl-2-pyridinamine (431 g, 4.0 mol) was dissolved in dichloromethane (700 ml) and 4-(2-bromoethyl)benzenesulfonyl chloride (340 g, 1.33 mol) was added at room temperature. After 1 h at 20° C., the solution was heated to 35° C. for 2 h. Excess dilute hydrochloric acid was added and the phases separated. After washing once with water, the organic phase was dried with MgSO4 and treated with decolorizing carbon. The solvent was evaporated and warm methanol added to the residue, which crystallized. The material was collected and recrystallized from toluene. Yield 178 g. A further crop of 36 g was obtained by workup of the mother liquor. Total yield 45%.
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