Hydrochloric Acid → N-({5-hydroxy-6-(1-methylethyl)-2-[(4'-nitro-2-biphenylyl)methyl]-3-oxo-2,3-dihydro-4-pyridazinyl}carbonyl)glycine

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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-nitrophenyl)boronic acid (29.5 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 (4 ml), acidified with 1N HCl (1 ml), and diluted with methanol (2 ml) then filtered to remove any residue followed by purification by HPLC chromatography (ODS silica, gradient 10-75% acetonitrile/water (0.1% TFA)) to afford the title compound N-({5-hydroxy-6-(1-methylethyl)-2-[(4′-nitro-2-biphenylyl)methyl]-3-oxo-2,3-dihydro-4-pyridazinyl}carbonyl)glycine (41 mg, 0.087 mmol, 49.2% yield) as a white powder. 1H NMR (400 MHz, DMSO-d6) d ppm 10.04 (t, J=5.43 Hz, 1H), 8.27 (ddd, J=9.03, 2.40, 2.21 Hz, 2 H), 7.69 (ddd, J=9.03, 2.40, 2.21 Hz, 2H), 7.37-7.48 (m, 2H), 7.20-7.34 (m, 2H), 5.27 (s, 2H), 4.03 (d, J=5.81 Hz, 2H), 3.10 (sept, J=6.86 Hz, 1H), 1.09 (d, J=6.82 Hz, 6 H). MS (ES+) m/e 467 [M+H]+.

Provenance & Evidence