[CH3:1][O:2][C:3]1[N:8]=[CH:7][C:6]([CH2:9][S:10]([CH2:13][C:14]([O-:16])=[O:15])(=[O:12])=[O:11])=[CH:5][C:4]=1[N+:17]([O-:19])=[O:18].C(=O)([O-])[O-].[Na+].[Na+]>O.CO>[CH3:1][O:2][C:3]1[N:8]=[CH:7][C:6]([CH2:9][S:10]([CH2:13][C:14]([OH:16])=[O:15])(=[O:12])=[O:11])=[CH:5][C:4]=1[N+:17]([O-:19])=[O:18]A solution of 2-((6-methoxy-5-nitropyridin-3-yl)methylsulfonyl)acetate (1.83 g, 6 mmol) and sodium carbonate (1.8 g, 15 mmol) in a mixture of water (10 mL) and methanol (10 mL) was stirred at room temperature for 4 hours. After evaporated to dryness, the residue was acidized by dropwise addition of 1N aq. HCl. White solid was precipitated gradually as pH was brought to 2 and filtrated to give the pure product (1.72 g, 98.7%). M.p. 183-186° C.; 1H-NMR (DMSO-d6): δ 4.06 (s, 3H, OCH3), 4.13 (s, 2H, CH2), 4.79 (s, 2H, CH2), 8.48 (d, 1H J=2.0 Hz, Py-H), 8.50 (d, 1H, J=2.0 Hz, Py-H); 13C-NMR (DMSO-d6): δ 55.07, 55.41, 57.15, 118.45, 133.64, 137.96, 154.26, 156.23, 164.88; HR-MS (ESI+) m/z: 289.0064 [M+H]+; C9H10N2O7S requires 290.0209
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