[NH2:1][C:2]1[CH:7]=[CH:6][N:5]=[CH:4][CH:3]=1.[C:8]([O:11][C:12](=[O:14])[CH3:13])(=[O:10])[CH3:9]>>[C:8]([OH:11])(=[O:10])[CH3:9].[C:12]([NH:1][C:2]1[CH:7]=[CH:6][N:5]=[CH:4][CH:3]=1)(=[O:14])[CH3:13]4-Aminopyridine (101.28 g) and acetic anhydride (110 g) were mixed neat and heated at 100° C. for 1/2 h. The solidified reaction mixture was triturated with acetone, filtered off, and washed with ether to afford 186.48 g of title compound as a white solid in two crops.
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