Dimethyl Sulfoxide → N-(5-(4-acetylpiperazin-1-yl)pyridin-2-yl)-2-(3-fluoro-4-(2-methylpyridin-4-yl)phenyl)acetamide

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To the mixture of N-(5-(4-acetylpiperazin-1-yl)pyridin-2-yl)-2-(4-chloro-3-fluorophenyl)acetamide 168-2 (80 mg, 0.2 mmol) and 2-methyl-4-(tributylstannyl)pyridine (78 mg, 0.2 mmol) in DMF (0.6 mL) was added [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II) (33 mg, 0.04 mmol). The reaction was stirred at 110° C. for 20 hours. After cooling down to room temperature, the reaction mixture was diluted into DMSO and purified by reverse-phase HPLC to give N-(5-(4-acetylpiperazin-1-yl)pyridin-2-yl)-2-(3-fluoro-4-(2-methylpyridin-4-yl)phenyl)acetamide 168 as white solid. MS m/z 448.1 (M+1); 1H NMR 400 MHz (DMSO-d6) δ10.57 (s, 1H), 8.52 (d, 1H), 8.04 (s, 1H), 7.93 (d, 1H), 7.59 (m, 1H), 7.44-7.29 (m, 5H), 3.77 (s, 2H), 3.58 (b, 2H), 3.14 (b, 2H), 3.08 (b, 2H), 2.55 (s, 2H), 2.51 (s, 3H), 2.04 (s, 3H).

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