[CH3:1][O:2][C:3]1[N:8]=[C:7]([CH2:9][S:10]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)(=[O:12])=[O:11])[C:6]([N+:19]([O-])=O)=[CH:5][CH:4]=1.[Sn]>CO.Cl>[NH2:19][C:6]1[C:7]([CH2:9][S:10]([C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=2)(=[O:12])=[O:11])=[N:8][C:3]([O:2][CH3:1])=[CH:4][CH:5]=1A stirred mixture of 6-methoxy-3-nitro-2-[(phenylsulfonyl)methyl]-pyridine (6.17 g, 20.0 mmol) in methanol and concentrated HCl (50 mL) is treated with thin strips of tin foil (10.0 g, 84.2 mmol), heated at 60° C. for 20 h, and filtered hot. The filtrate is poured over ice and 2.5N aqueous NaOH, stirred for 0.5 h and filtered. The filtercake is air-dried to afford the title compound as a white solid 5.26 g (94% yield), identified by mass spectral and HNMR analyses.
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