CO.[NH3:3].Cl[C:5]1[C:6]2[C:13]([I:14])=[CH:12][N:11]([CH2:15][O:16][CH2:17][CH2:18][Si:19]([CH3:22])([CH3:21])[CH3:20])[C:7]=2[N:8]=[CH:9][N:10]=1>CO.O>[I:14][C:13]1[C:6]2[C:5]([NH2:3])=[N:10][CH:9]=[N:8][C:7]=2[N:11]([CH2:15][O:16][CH2:17][CH2:18][Si:19]([CH3:22])([CH3:21])[CH3:20])[CH:12]=1An 8 N ammonia methanol solution (120 ml) was added to the 4-chloro-5-iodo-7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidine (20.0 g) obtained in Step 1, and the mixture was stirred in a microwave reactor at 120° C. for 1 hour. After being cooled, the reaction mixture was diluted with methanol (65 ml) and water (185 ml). The resulting precipitate was collected by filtration, washed with water, and dried under reduced pressure to obtain the title compound (15.2 g) as a white solid.
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