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To a solution of 3-[4-(7-[2-(trimethylsilyl)ethoxy]methyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]pentanal (300 mg, 0.0008 mol) in DCM (4 mL, 0.06 mol) cooled at 0° C., triphenylphosphine (800 mg, 0.003 mol) and carbon tetrabromide (500 mg, 0.002 mol) were added. The reaction was stirred at 0° C. for 10 min, water was added and extracted with ethyl acetate. The combined organic extracts were washed with saturated sodium chloride, dried over magnesium sulfate, filtered and concentrated. The crude product was purified by prep LC-MS (ACN, water, NH4OH) to give 4-[1-(4,4-dibromo-1-ethylbut-3-en-1-yl)-1H-pyrazol-4-yl]-7-[2-(trimethylsilyl)-ethoxy]methyl-7H-pyrrolo[2,3-d]pyrimidine as an amorphous solid (50 mg, 10%). 1H NMR (400 MHz, CDCl3): δ □□8.9 (s, 2H), 8.4 (s, 1H), 8.3 (s, 1H), 7.4 (m, 1H), 7.3 (s, 1H), 6.9 (m, 1H), 6.4 (m, 1H), 5.7 (s, 2H), 4.2 (m, 1H), 3.6 (m, 2H), 2.8 (m, 2H), 2.1 (m, 1H), 2.0 (m, 1H), 1.0 (m, 5H), LC/MS (M+H)+: m/z=556

1. extractionextracted with ethyl acetate
2. washThe combined organic extracts were washed with saturated sodium chloride
3. dry with materialdried over magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude product was purified by prep LC-MS (ACN, water, NH4OH)