[CH2:1]([N:5]1[CH:10]=[CH:9][CH:8]=[C:7]([OH:11])[C:6]1=[S:12])[CH2:2][CH2:3][CH3:4]>C(O)C>[CH2:1]([N:5]1[CH:10]=[CH:9][C:8]([CH2:1][N:5]([CH3:10])[CH3:6])=[C:7]([OH:11])[C:6]1=[S:12])[CH2:2][CH2:3][CH3:4]To a solution of 1-butyl-3-hydroxypyridine-2-thione (2-034-04) (1.0 g) in ethanol containing 10% water (20 mL) was added N, N, N′, N′-teteramethyldiaminomethane (1.70 g) at room temperature. After the reaction mixture was stirred at 75° C. for 24 h, the solvent was evaporated under reduced pressure to give 1-butyl-3-hydroxy-4(N,N-dimethylaminomethyl)pyridine-2-thione (2-034-05) (1.3 g, 95%) as an oil.
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