[O-:1][Mn](=O)(=O)=O.[K+].[CH3:7][N:8]1[C:12]([S:13][CH3:14])=[N:11][N:10]=[C:9]1[C:15]1[CH:16]=[N:17][CH:18]=[CH:19][CH:20]=1.[OH-:21].[Na+].C(Cl)(Cl)Cl>O.C(O)(=O)C>[CH3:7][N:8]1[C:12]([S:13]([CH3:14])(=[O:1])=[O:21])=[N:11][N:10]=[C:9]1[C:15]1[CH:16]=[N:17][CH:18]=[CH:19][CH:20]=1
KMnO4 (5 g, 32 mmol) was added to a solution of 3-[4-methyl-5-(methylthio)-4H-1,2,4-triazol-3-yl]pyridine (6.0 g, 29 mmol) in H2O (40 mL) and acetic acid (100 mL). After 1 h stirring at r.t. the reaction was basified with 4M NaOH. CHCl3 was added and the mixture was filtrated through celite. The layers were separated and the water phase was washed with CHCl3. The combined organic phase was dried and concentrated to give 3.67 g (53%) of the title compound. 1H NMR: 3.59 (s, 3H) 3.99 (s, 3H) 7.52 (m, 1H) 8.02 (dt, 1H) 8.83 (dd, 1H) 8.91 (m, 1H)
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