To a solution of 6-{[2-Chloro-3-(trifluoromethyl)phenyl]carbonyl}-3-iodo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine (Intermediate 57) (47 mg, 0.103 mmol) in 1,4-dioxane (1 mL) was added 2-tributylstannylpyrazine (0.041 mL, 0.124 mmol), lithium chloride (4 mg, 0.103 mmol) and tetrakis(triphenylphosphine)palladium(0) (119 mg, 0.103 mmol). The reaction was allowed to stir overnight at 110° C. and an additional 3 h in a microwave reactor at 170° C. The reaction was diluted with water and EtOAc and 50% potassium fluoride on Celite© (1 g) was added. After stirring for 1 h, the solution was filtered and the layers in the filtrate were separated. The organic layer was concentrated in vacuo and the residue was purified by HPLC (Agilent prep system, Waters XBridge, C18, 5 μm, 30×100 mm column, 5-99% MeOH/20 mM NH4OH over 18 min at 30 mL/min) to give the desired product. (3 mg, 8%). MS (ESI) mass calcd. C18H13ClF3N5O, 407.1. m/z found 408.1 [M+H]+. 1H NMR (500 MHz, CDCl3) δ 8.88 (br s, 1H), 8.60-8.50 (m, 2H), 7.82-7.75 (m, 1H), 7.57-7.41 (m, 3H), 5.20-5.13 (m, 0.5H), 4.95-4.87 (m, 0.5H), 4.52 (d, J=15.7 Hz, 0.5H), 4.41 (d, J=15.8 Hz, 0.5H), 4.34-4.27 (m, 0.5H), 4.10-3.97 (m, 0.5H), 3.60-3.53 (m, 1H), 3.16-3.12 (m, 1H), 2.98 (m, 1H).
