[NH2:1][N:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]1=[NH2+:8].CC1C=C(C)C=C(C)C=1S([O-])(=O)=O.[OH-].[Na+].[OH:24][CH2:25][C:26](OC)=O>CCO>[N:8]1[C:26]([CH2:25][OH:24])=[N:1][N:2]2[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=12To a solution of 1-aminopyridin-2(1H)-iminium-2,4,6-trimethylbenzenesulfonate (1.24 g, 4 mmol) in EtOH (15 mL) was added NaOH (320 mg, 8 mmol). The mixture was heated to 60° C. and stirred for 1 h. Then methyl 2-hydroxyacetate (720 mg, 8 mmol) was added and the mixture was heated to 80° C. and stirred for 3 h. The resulting mixture was cooled to room temperature and concentrated under reduced pressure. The residue was washed with water (10 mL) and extracted with DCM (15 mL×3). The combined organic layers were washed with brine (10 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure to afford the title compound as a pale yellow solid (350 mg, 59% yield). ESI MS: m/z 150 [M+H]+.
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