A mixture of the 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrolo[2,3-b]pyridine B-33-4, which was prepared from 5-bromo-1H-pyrrolo[2,3-b]pyridine according to known literature methods, (145 mg, 0.594 mmol), 3-({4-[1-(2,2-difluoroethyl)-3-iodo-1H-pyrazol-4-yl]pyrimidin-2-yl}amino)propanenitrile (200 mg, 0.495 mmol), and cesium fluoride (1.48 mL of a 1M aqueous solution) in 3 mL of DME was deoxygenated with a nitrogen bubbler for 5 min and then [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) 1:1 complex with dichloromethane (41 mg, 0.05 mmol) was added. The mixture was then heated in a microwave reactor at 80° C. for 2.5 hours. The reaction was degassed and fresh catalyst (20 mg) was added. The mixture was heated in the microwave at 80° C. for 4 more hours. The resulting dark mixture was partitioned between ethyl acetate and brine. The aqueous layer was extracted twice with ethyl acetate. The combined organics were washed with brine, dried over Magnesium sulfate and reduced to minimum volume. The residue was purified on silica gel using a gradient of 0-8% methanol (containing 10% ammonium hydroxide) in a mixture of tert-butyl methyl ether and dichloromethane (1:1) to give the desired product as a pale orange solid. This material was triturated twice with tert-butyl methyl ether to give 82 mg (42%) of analytically pure 3-({4-[1-(2,2-difluoroethyl)-3-(1H-pyrrolo[2,3-b]pyridin-5-yl)-1H-pyrazol-4-yl]pyrimidin-2-yl}amino)propanenitrile as an off white solid. 1H NMR (400 MHz, ACETONITRILE-d3) δ ppm 9.73 (br. s., 1H), 8.37 (d, J=2.02 Hz, 1H), 8.22 (s, 1H), 8.10 (d, J=5.31 Hz, 1H), 8.08 (d, J=1.52 Hz, 1H), 7.35-7.46 (m, 1H), 6.54 (d, J=3.79 Hz, 1H), 6.51 (dd, J=3.54, 2.02 Hz, 1H), 6.30 (tt, J=55.04, 3.82 Hz, 1H), 5.91 (br. t, J=6.82 Hz, 1H), 4.62 (td, J=14.65, 3.79 Hz, 2H), 3.39 (br. s., 2H), 2.40 (br. s., 2H).
