Isonicotinic Acid → {4-[Bis-(3-methyl-pyridin-2-ylmethyl)-amino]-piperidin-1-yl}-pyridin-4-yl-methanone

Participants

Reaction Conditions

Reaction Steps

To a cold (0° C.), stirred, mixture of isonicotinic acid (130 mg, 1.05 mmol) in CH2Cl2 (10 mL) was added DMF (1 mL) followed by oxalyl chloride (0.46 mL, 5.27 mmol). The mixture was warmed to room temperature. After 15 minutes the mixture was concentrated under reduced pressure and provided a white solid. To a solution of COMPOUND 249 (60 mg, 0.19 mmol) in THF (7 mL) was added the white solid from above followed by DIPEA (1.20 mL, 6.88 mmol). The resultant mixture was stirred at room temperature for 2.5 hours then diluted with 1.0 N NaOH (10 mL) and EtOAc (50 mL). The phases were separated and the organic phase was washed with 1.0 N NaOH (3×10 mL) and brine (10 mL), dried (Na2SO4), and concentrated. Purification of the crude material by radial chromatography on silica gel (1 mm plate, 50:1:1 CH2Cl2-MeOH—NH4OH) provided 33 mg (42%) of COMPOUND 266 as a white solid. 1H NMR (CDCl3) δ 1.50-1.76 (m, 2H), 1.80-2.04 (m, 2H), 2.09 (s, 6H), 2.57-3.02 (m, 3H), 3.65-3.91 (m, 5H), 4.76-4.84 (m, 1H), 7.09 (dd, 2H, J=7.5, 4.8 Hz), 7.27 (d, 2H, J=5.7 Hz), 7.38 (d, 2H, J=7.5 Hz), 8.35 (d, 2H, J=4.8 Hz), 8.69 (d, 2H, J=5.7 Hz); ES-MS m/z 416 (M+H).

Provenance & Evidence