Dimethylformamide → tert-butyl 4-{3-cyano-2-[3-(7-{[2-(trimethylsilyl)ethoxy]methyl}-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrrol-1-yl]propyl}piperazine-1-carboxylate

To a mixture of (E)- and (Z)-tert-butyl 4-(3-cyanoallyl)piperazine-1-carboxylate (4.0 g, 0.016 mol; prepared as in Example 1, Steps 1-2) and 4-(1H-pyrrol-3-yl)-7-{[2-(trimethylsilyl)ethoxy]methyl}-7H-pyrrolo[2,3-d]pyrimidine (4.2 g, 0.013 mol, prepared as in WO2009/114512, Example 82) in N,N-Dimethylformamide (25 mL) was added potassium carbonate (5.540 g, 0.0401 mol). The mixture was stirred at 60° C. for 17 hours. Additional (E)- and (Z)-tert-butyl 4-(3-cyanoallyl)piperazine-1-carboxylate (4.0 g, 0.016 mol) was added and the reaction was stirred at 60° C. for 24 hours. A further portion of (E)- and (Z)-tert-butyl 4-(3-cyanoallyl)piperazine-1-carboxylate (4.0 g, 0.016 mol) was added. After 3 nights of heating, most of the starting material had been converted to desired product as determined by LCMS. The mixture was then filtered, diluted with EtOAc, washed with water (3 times), brine (once), dried over sodium sulfate, decanted and concentrated. Purification via preparative HPLC-MS (eluting with a gradient of MeCN/H2O containing 0.15% NH4OH) afforded a brown foam (4.20 g, 55%). 1H NMR (300 MHz, CDCl3): δ 8.81 (s, 1H), 7.66 (t, 1H), 7.34 (d, 1H), 6.97 (dd, 1H), 6.89 (t, 1H), 6.84 (d, 1H), 5.66 (s, 2H), 4.47-4.36 (m, 1H), 3.57-3.50 (m, 2H), 3.45-3.37 (m, 4H), 3.06 (dd, 1H), 3.00-2.90 (m, 2H), 2.83 (dd, 1H), 2.57-2.35 (m, 4H), 1.45 (s, 9H), 0.96-0.86 (m, 2H), −0.06 (s, 9H); LCMS (M+H)+: 566.3.