Methyl chloroformate → Methyl 4-(6-((3-fluoro-2'-(trifluoromethyl)-2,4'-bipyridin-5-yl)methylcarbamoyl)pyridin-3-yl)piperazine-1-carboxylate

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Reaction Steps

To a solution of N-((3-fluoro-2′-(trifluoromethyl)-2,4′-bipyridin-5-yl)methyl)-5-(piperazin-1-yl)picolinamide 49-6 (64 mg, 0.14 mmol) and DIEA (0.07 mL, 0.42 mmol) in THF (1 mL) was added methyl chloroformate (13 uL, 0.17 mmol) dropwise at room temperature. The mixture was stirred for 2 hours. The solvent was removed by rotary evaporation. The crude product was purified by reverse phase HPLC to give methyl 4-(6-((3-fluoro-2′-(trifluoromethyl)-2,4′-bipyridin-5-yl)methylcarbamoyl)pyridin-3-yl)piperazine-1-carboxylate 93 as a white powder. MS m/z 519.20 (M+1); 1H NMR 400 MHz (DMSO-d6) δ 9.28 (t, 1H, J=6.4 Hz), 8.92 (d, 1H, J=5.2 Hz), 8.62 (m, 1H), 8.32 (m, 2H), 8.20 (d, 1H, J=5.2 Hz), 7.88-7.82 (m, 2H), 7.43 (dd, 1H, J1=7.0 Hz, J2=3.2 Hz), 4.59 (d, 2H, J=6.4 Hz), 3.73 (s, 3H), 3.54-3.51 (m, 4H), 3.37-3.35 (m, 4H).

Provenance & Evidence