A mixture of tert-butyl 4-{4-[2-(3-iodophenyl)pyrimidin-5-yl]-1H-pyrazol-1-yl}piperidine-1-carboxylate (intermediate 18, 315 mg; 0.59 mmol; 1.0 eq.), Ethynyl-trimethyl-silane (83 μl; 0.59 mmol; 1.0 eq.), (dppf)PdCl2.CH2Cl2 (26 mg; 0.04 mmol; 0.06 eq.), CuI (7 mg; 0.04 mmol; 0.06 eq.) and TEA (115 μl; 0.89 mmol; 1.5 eq.) in dry THF (3.6 mL) and dry DMF (1 mL) was heated in a sealed vial at 80° C. for 48 h. The reaction mixture was then diluted with EtOAc and washed with sat. NH4Cl and brine. Organic phase was dried over magnesium sulfate, filtered and concentrated. Purification by flash chromatography on silica (heptanes:EtOAC, gradient form 90:10 to 50:50) afforded the title compound as a beige solid (115 mg, 39%). 1H NMR (300 MHz, DMSO-d6) d 9.17 (s, 2H), 8.57 (s, 1H), 8.41-8.38 (m, 1H), 8.15 (s, 2H), 7.61-7.54 (m, 2H), 4.08-4.03 (m, 2H), 2.96 (m, 2H9, 2.08-2.05 (m, 2H), 1.83-1.77 (m, 2H), 1.43 (s, 9H), 0.26 (s, 9H). MS (ESI+): 502.5.
