[H-].[Na+].[Br:3][C:4]1[C:12]2[C:11]([Cl:13])=[N:10][CH:9]=[N:8][C:7]=2[NH:6][CH:5]=1.Cl[CH2:15][O:16][CH2:17][CH2:18][Si:19]([CH3:22])([CH3:21])[CH3:20].O>CN(C)C=O>[Br:3][C:4]1[C:12]2[C:11]([Cl:13])=[N:10][CH:9]=[N:8][C:7]=2[N:6]([CH2:15][O:16][CH2:17][CH2:18][Si:19]([CH3:22])([CH3:21])[CH3:20])[CH:5]=1Sodium hydride (60% dispersion in mineral oil, 0.205 g, 5.13 mmol) was suspended in 5 mL dimethylformamide. The mixture was stirred for 10 min and then cooled at 0° C. with an ice bath. 5-Bromo-4-chloro-7H-pyrrolo[2,3-d]pyrimidine (1 g, 4.30 mmol) dissolved in 5 mL dimethylformamide was added dropwise and the mixture was stirred for 30 min. At the same temperature [2-(chloromethoxy)ethyl](trimethyl)silane (0.9 g, 5.4 mmol) dissolved in 5 mL dimethylformamide was added dropwise and stirred for 30 min at 0° C. The mixture was poured into water and extracted twice with ethyl acetate. The organics were dried over sodium sulphate and concentrated under reduced pressure. The residue was purified using SP1® Purification System (0% to 100%, hexane-ethyl acetate) to give 1.18 g (76% yield) of the title compound as a white solid. Purity 100%.
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