Hydrochloric Acid → 2'-{[5-{[(carboxymethyl)amino]carbonyl}-4-hydroxy-3-(1-methylethyl)-6-oxo-1(6H)-pyridazinyl]methyl}-4-biphenylcarboxylic acid

Participants

Reaction Steps

To a 5 ml microwave tube was added N-{[2-[(2-bromophenyl)methyl]-5-hydroxy-6-(1-methylethyl)-3-oxo-2,3-dihydro-4-pyridazinyl]carbonyl}glycine (example 78(b), 75 mg, 0.177 mmol), 4-carboxybenzeneboronic acid (29.3 mg, 0.177 mmol), potassium carbonate (73.3 mg, 0.530 mmol), and tetrakis(triphenylphosphine)palladium (0) (6.13 mg, 5.30 μmol) in 1,4-Dioxane (1.5 ml) and Water (0.500 ml). The mixture was irradiated at 100° C. for 20 minutes. The reaction mixture was diluted with water (5 ml), acidified with 1N HCl (2 ml), and extracted with ethyl acetate (20 ml). The organic phase was dried over MgSO4, filtered, and solvents removed under reduced pressure. The crude residue was purified by HPLC chromatography (ODS silica, gradient 10-75% acetonitrile/water (0.1% TFA)) to afford the title compound 2′-{[5-{[(carboxymethyl)amino]carbonyl}-4-hydroxy-3-(1-methylethyl)-6-oxo-1(6H)-pyridazinyl]methyl}-4-biphenylcarboxylic acid (non-preferred name) (30 mg, 0.064 mmol, 36.1% yield) as a white powder. 1H NMR (400 MHz, DMSO-d6) d ppm 15.82 (s, 1H), 12.99 (br. s., 2 H), 10.06 (t, J=5.68 Hz, 1H), 7.99 (d, J=8.34 Hz, 2H), 7.52 (d, J=8.34 Hz, 2 H), 7.38 (dt, J=4.36, 2.24 Hz, 2H), 7.25-7.32 (m, 1H), 7.17-7.24 (m, 1H), 5.26 (s, 2H), 4.06 (d, J=5.56 Hz, 2H), 3.11 (sept, J=6.82 Hz, 1H), 1.10 (d, J=6.82 Hz, 6H). MS (ES+) m/e 466 [M+H]+.

Provenance & Evidence