1-Methyl-1H-pyrazole-3-sulfonyl chloride (130 mg, 0.72 mmol), 4-piperazin-1-yl-3-[4-(7-{[2-(trimethylsilyl)ethoxy]methyl}-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]butanenitrile hydrochloride (from example 1, step 4; 300 mg, 0.6 mmol), and triethylamine (250 μL, 0.0018 mol) were dissolved in acetonitrile (3 mL). The mixture was stirred at RT for 1 h, and evaporated to dryness under reduced pressure. The residue was treated with DCM (0.5 mL) and trifluoroacetic acid (0.5 mL, 0.006 mol) for 30 min. The reaction mixture was evaporated under reduced pressure. To the resultant residue was added methanol (2 mL) and ethylenediamine (0.2 mL, 0.003 mol). The reaction mixture was stirred at RT for 30 min, and evaporated under reduced pressure. The crude product was purified on RP-HPLC (XBridge C-18 Column, eluting with a gradient of acetonitrile/water containing 0.15% NH4OH, at flow rate 60 mL/min) to give the desired product (259 mg, 90.4%). LCMS calculated for C21H25N10O2S(M+H)+: m/z=481.2; Found: 481.0. 1H NMR (300 MHz, CD3OD): δ 8.95 (1H, s), 8.90 (1H, s), 8.52 (1H, s), 7.88 (1H, d, J=3.6 Hz), 7.71 (1H, d, J=2.4 Hz), 7.27 (1H, d, J=3.6 Hz), 6.62 (1H, d, J=2.4 Hz), 5.15 (1H, m), 3.89 (3H, s), 3.20˜3.12 (8H, m), 2.94 (2H, m), 2.77 (2H, m) ppm.
