[CH3:1][C:2]1[C:7]([C:8]#[N:9])=[CH:6][CH:5]=[CH:4][N:3]=1.[CH2:10](N)[CH2:11][NH2:12].[S].[Mn]([O-])(=O)(=O)=O.[K+].[Si](=O)=O>C(O)C.C(#N)C.O.C1(C)C=CC=CC=1>[NH:9]1[CH:10]=[CH:11][N:12]=[C:8]1[C:7]1[C:2]([CH3:1])=[N:3][CH:4]=[CH:5][CH:6]=12-Methyl-3-pyridinecarbonitrile 1.05 g, ethylenediamine 5 mL and sulfur 71 mg were mixed, and stirred at 120° C. for 24 hours. Cooling it off to room temperature, toluene and water were added to effect phase separation. The aqueous layer was dried to solid under reduced pressure. Thus obtained crude product was mixed with potassium permanganate/silicon dioxide (carried at a ratio of 2.81 g:3.57 g) 6.38 g and acetonitrile 10 mL at room temperature, and stirred (inducing a rapid exothermic reaction). After the exotherm subsided and the reaction liquid was restored to room temperature, the liquid was diluted with 20 mL of ethanol and filtered through Celite. The solvent was distilled off and the residue was recrystallized from ethyl acetate/methanol (10:1) to provide 1.03 g of the title compound.
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