Methanesulfonyl chloride (137 mg, 0.00119 mol), 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 (0.5 g, 0.994 mmol) and triethylamine (416 μL, 0.00298 mol) were mixed in acetonitrile (5 mL). The mixture was stirred at RT for 1 h. The completion of the reaction was checked with LC/MS. Solvents were evaporated. The crude product was treated with DCM (1 mL) and trifluoroacetic acid (1 mL, 0.01 mol) for 30 min. The reaction mixture was evaporated under reduced pressure. To the resultant residue was added methanol (3 mL, 0.07 mol) and ethylenediamine (0.3 mL, 0.004 mol) and stirred at RT for 30 min, and concentrated to dryness under reduced pressure. The residue 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 110 mg (27%) of the desired product. LCMS calculated for C18H23N8O2S(M+H)+: m/z=415.2; Found: 415.0. 1H NMR (400 MHz, CD3OD): δ 8.66 (1H, s), 8.63 (1H, s), 8.37 (1H, s), 7.51 (1H, d, J=3.6 Hz), 6.95 (1H, d, J=4.0 Hz), 4.95 (1H, m), 3.19-3.14 (6H, m), 2.95 (2H, m), 2.77 (3H, s), 2.67 (2H, m), 2.65 (2H, m) ppm.
