Reaction Steps
To a solution of 2-fluoro-N-methyl-4-(3-(piperidin-4-yl)pyrazin-2-yl)benzamide (155 mg, 0.493 mmol, prepared according to Step 2 of Example 1), 2-chloro-6-fluoroquinoline (108 mg, 0.595 mmol, Combi-blocks), and DMSO (2 mL) was added potassium carbonate (240 mg, 1.737 mmol). The solution was stirred at 100° C. After 72 h, the reaction was allowed to cool to room temperature and diluted with water (50 mL). After stirring for 30 min, the solution was filtered and the filtered solid adsorbed onto a plug of silica gel and chromatographed through a Redi-Sep® pre-packed silica gel column (12 g), eluting with 0-80% EtOAc in hexane, to provide a light yellow solid, which contained residual DMSO as measure by NMR. The solids were redissolved in diethyl ether and washed with water, brine, and concentrated in vacuo to give 2-fluoro-4-(3-(1-(6-fluoroquinolin-2-yl)piperidin-4-yl)pyrazin-2-yl)-N-methylbenzamide (90 mg, 0.196 mmol, 39.7% yield), as a light yellow solid. m/z=460 (M+1). 1H NMR (300 MHz, CDCl3) δ ppm 8.55 (d, J=2.48 Hz, 1H), 8.49 (d, J=2.48 Hz, 1H), 8.26 (t, J=8.04 Hz, 1H), 7.82 (d, J=9.21 Hz, 1H), 7.65 (dd, J=5.26, 9.06 Hz, 1H), 7.44 (dd, J=1.61, 8.04 Hz, 1H), 7.36 (dd, J=1.61, 12.42 Hz, 1H), 7.28-7.32 (m, 1H), 7.22 (dd, J=2.92, 8.92 Hz, 1H), 7.04 (d, J=9.21 Hz, 1H), 6.77 (br. s., 1H), 4.64 (d, J=13.45 Hz, 2H), 3.14-3.31 (m, 1H), 3.03-3.14 (m, 3H), 2.81-3.02 (m, 2H), 2.05-2.21 (m, 2H), 1.82 (d, J=11.69 Hz, 2H).
