[CH3:1][NH:2][C:3]1[C:8]([NH2:9])=[CH:7][C:6]([C:10]([F:13])([F:12])[F:11])=[CH:5][N:4]=1.[C:14]([C:16]1[CH:24]=[N:23][CH:22]=[CH:21][C:17]=1[C:18](O)=O)#[CH:15].CCN=C=NCCCN(C)C.N1C=CC=CC=1>O>[C:14]([C:16]1[CH:24]=[N:23][CH:22]=[CH:21][C:17]=1[C:18]1[N:2]([CH3:1])[C:3]2=[N:4][CH:5]=[C:6]([C:10]([F:11])([F:12])[F:13])[CH:7]=[C:8]2[N:9]=1)#[CH:15]
A mixture of 0.29 g of N2-methyl-5-trifluoromethylpyridine-2,3-diamine, 0.27 g of 3-ethynylisonicotinic acid, 0.35 g of WSC and 8 ml of pyridine was stirred for 2 hours at 120° C. The reaction mixture was cooled down to room temperature. Into the reaction mixture was poured water, and the mixture was extracted three times with ethyl acetate. The organic layer was dried over magnesium sulfate, then, concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to obtain 0.15 g of 2-(3-ethynylpyridin-4-yl-)-3-methyl-6-trifluoromethyl-3H-imidazo[4,5-b]pyridine (hereinafter, referred to as present active compound 211).
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