Cl[C:2]1[C:3]([NH:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)=[N:4][CH:5]=[CH:6][N:7]=1.[CH3:15][NH2:16]>>[CH3:15][NH:16][C:2]1[C:3]([NH:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)=[N:4][CH:5]=[CH:6][N:7]=13-chloro-N-phenylpyrazin-2-amine (4.5 g, 21.22 mmol) was stirred with methyl amine (20.59 g, 20.9 mmol, 33 wt % in THF) under reflux overnight. The solvent was evaporated and the residue was purified by column chromatography using 50% ethyl acetate and hexanes to give N2-methyl-N3-phenylpyrazine-2,3-diamine (2.4 g, 54.8%).
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