Hydrochloric Acid → 5-(1'-{[2,6-Dimethoxybiphenyl-4-yl]carbonyl}-4-oxospiro[chroman-2,4'-piperidin]-6-yl)pyridine-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Carbonyldiimidazole (81 mg) was added to a DMF solution (2 mL) of 2,6-dimethoxybiphenyl-4-carboxylic acid (129 mg), and stirred at 60° C. for 2.5 hours. To the reaction liquid, added were 5-(4-oxospiro[chroman-2,4′-piperidin]-6-yl)pyridine-3-carboxylic acid dihydrochloride (246 mg) and triethylamine (209 ml), and stirred at that temperature for 17 hours. 1 N hydrochloric acid and water were added to the reaction liquid, and the resulting solid was purified through high-performance preparative liquid chromatography (0.1% TFA, water/acetonitrile). Then, this was further purified through silica gel thin-layer chromatography (chloroform/methanol) to obtain the title compound. 1H-NMR (400 MHz, DMSO-d6) δ: 9.06 (1.0H, d, J=2.4 Hz), 9.02 (1.0H, d, J=2.0 Hz), 8.41 (1.0H, dd, J=2.4, 2.0 Hz), 8.12-8.01 (2.0H, m), 7.38-7.32 (2.0H, m), 7.29-7.24 (2.0H, m), 7.23-7.19 (2.0H, m), 6.75 (2.0H, s), 4.36-4.22 (1.0H, br m), 3.69-3.12 (3.0H, m), 3.68 (6.0H, s), 2.95 (2.0H, s), 2.15-1.93 (2.0H, m), 1.91-1.75 (2.0H, m). MS [M+H]+=579.

Provenance & Evidence