[Br:1][C:2]1[CH:3]=[C:4]([C:8](=[N:10][OH:11])[NH2:9])[CH:5]=[N:6][CH:7]=1.[C:12](Cl)(=O)[CH3:13]>N1C=CC=CC=1.CCOC(C)=O.C([O-])(O)=O.[Na+]>[Br:1][C:2]1[CH:7]=[N:6][CH:5]=[C:4]([C:8]2[N:9]=[C:12]([CH3:13])[O:11][N:10]=2)[CH:3]=1To a solution of 5-bromo-N′-hydroxypyridine-3-carboximidamide (1.0 eq.) in pyridine was added acetyl chloride (2 eq). The reaction stirred at 100° C. for 1 h and 2 eq of acetyl chloride was added. After 1 h, the mixture was cooled, diluted with EtOAc and aqueous NaHCO3. The organic extracts were washed with aqueous NaHCO3, brine, dried over Na2SO4, filtered and concentrated. Flash chromatography (Hex:EtOAc; 70:30) afforded the title compound as a white solid.
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