Br[C:2]1[C:10]2[C:9]([Cl:11])=[N:8][CH:7]=[N:6][C:5]=2[N:4]([CH2:12][O:13][CH2:14][CH2:15][Si:16]([CH3:19])([CH3:18])[CH3:17])[CH:3]=1.[CH3:20][O:21][C:22]1[CH:23]=[C:24]([SH:28])[CH:25]=[CH:26][CH:27]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O.[Cu]I>[Cl:11][C:9]1[C:10]2[C:2]([S:28][C:24]3[CH:25]=[CH:26][CH:27]=[C:22]([O:21][CH3:20])[CH:23]=3)=[CH:3][N:4]([CH2:12][O:13][CH2:14][CH2:15][Si:16]([CH3:19])([CH3:18])[CH3:17])[C:5]=2[N:6]=[CH:7][N:8]=1
5-Bromo-4-chloro-7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidine (300 mg, 0.74 mmol) was dissolved in 3 mL dimethylformamide. 3-Methoxybenzenethiol (140 mg, 1.10 mmol), copper(I) iodide (205 mg, 1.1 mmol) and potassium carbonate (152 mg, 1.1 mmol) were added. The reaction vessel was sealed and submitted to three vacuum-nitrogen cycles. The reaction was heated at 70° C. for 5 h. The mixture was poured into water-ice and extracted twice with ethyl acetate. The organics were dried over sodium sulphate, filtered and concentrated under reduced pressure. The crude was purified using SP1® Purification System (0% to 20%, hexane-ethyl acetate) to obtain 128 mg (70% yield) of the title compound as a solid. Purity 83%.
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