Sulfamic Acid → 2,4-Dichloronicotinic Acid
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[Cl:1][C:2]1[C:7]([CH:8]=[O:9])=[C:6]([Cl:10])[CH:5]=[CH:4][N:3]=1.Cl([O-])=[O:12].[Na+].S(=O)(=O)(O)N>C1COCC1.O.[OH-].[Na+]>[Cl:1][C:2]1[N:3]=[CH:4][CH:5]=[C:6]([Cl:10])[C:7]=1[C:8]([OH:12])=[O:9][Cl:1][C:2]1[C:7]([CH:8]=[O:9])=[C:6]([Cl:10])[CH:5]=[CH:4][N:3]=1.Cl([O-])=[O:12].[Na+].S(=O)(=O)(O)N>C1COCC1.O.[OH-].[Na+]>[Cl:1][C:2]1[N:3]=[CH:4][CH:5]=[C:6]([Cl:10])[C:7]=1[C:8]([OH:12])=[O:9]
A solution of 0.40 g of the aldehyde from Step B was dissolved in 6 mL of THF and then added to a solution of 0.27 g of sodium chlorite and 0.29 g of sulfamic acid in 6 mL of water. The reaction mixture was stirred at room temperature overnight. The reaction mixture was diluted with 1 N sodium hydroxide (10 mL) and extracted with diethyl ether (1×). The aqueous layer was then acidified with concentrated HCl, extracted with methylene chloride (2×), and the combine methylene chloride extracts were dried over magnesium sulfate. The methylene chloride was removed under vacuum to give 0.22 g of a solid. 1H NMR (CDCl3; 300 MHz) δ 7.38 (d, 1H J is 5.4 Hz), 8.40 (d, 1H, J is 5.5 Hz), 8.60 (bs, 1H).
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