C[O:2][C:3]1[N:8]=[C:7]([CH:9]([NH2:11])[CH3:10])[CH:6]=[CH:5][CH:4]=1.[BrH:12]>>[BrH:12].[NH2:11][CH:9]([C:7]1[NH:8][C:3](=[O:2])[CH:4]=[CH:5][CH:6]=1)[CH3:10]To 1.6 g of 1-(6-methoxypyridin-2-yl)ethanamine was added 23.7 ml of a 47% aqueous hydrobromic acid solution, followed by stirring at 80° C. for 60 hours. After evaporating the solvent under reduced pressure, the residue was washed with diethyl ether to obtain 2.95 g of 6-(1-aminoethyl)pyridin-2(1H)-one hydrobromide as a pale brown solid.
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