[H-].[Na+].[OH:3][C:4]1[CH:5]=[C:6]2[C:10](=[CH:11][CH:12]=1)[NH:9][CH:8]=[CH:7]2.[NH2:13][C:14]1[N:19]=[C:18](Cl)[CH:17]=[C:16]([Cl:21])[N:15]=1>CS(C)=O>[Cl:21][C:16]1[CH:17]=[C:18]([O:3][C:4]2[CH:5]=[C:6]3[C:10](=[CH:11][CH:12]=2)[NH:9][CH:8]=[CH:7]3)[N:19]=[C:14]([NH2:13])[N:15]=1Sodium hydride (1.0 g, 25 mmol) was suspended in dimethyl sulfoxide (40 ml) under nitrogen atmosphere, and 5-hydroxyindole (3.33 g, 25 mmol) was gradually added while the reaction mixture was stirred at room temperature. After 20 minutes, 2-amino-4,6-dichloropyrimidine (3.28 g, 20 mmol) was added. The reaction mixture was heated at 100° C. and was stirred for 3 hours. After the reaction mixture was cooled to room temperature, the reaction mixture was partitioned between ethyl acetate and 10% aqueous ammonia solution. The organic layer was washed with water and brine, and dried over anhydrous sodium sulfate. After the solvent was distilled off, the residue was purified by NH silica gel column chromatography (eluent; ethyl acetate:hexane=2:1). The crystals were precipitated from ethyl acetate, filtered off, and dried under aeration to yield the title compound (1.15 g, 4.41 mmol, 22.0%) as white crystals.
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