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

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Reaction Conditions

Reaction Steps

To a 100 mL round bottom flask was added ethyl 5-hydroxy-6-(1-methylethyl)-3-oxo-2,3-dihydro-4-pyridazinecarboxylate (example 14(a), 55 mg, 0.243 mmol) and Glycine Sodium Salt (59.0 mg, 0.608 mmol) in 2-methoxyethanol (10 ml) and the mixture was refluxed at 130° C. for 2 hours. The mixture was diluted with water (10 ml) and acidified with 1N HCl. The aqueous solution was then extracted with ethyl acetate (40 mL), organics dried over MgSO4, filtered and solvents removed by evaporation. The crude oil was purified by HPLC chromatography (ODS silica, gradient 25-95% acetonitrile/water (0.1% TFA)) to afford the title compound, N-{[5-hydroxy-6-(1-methylethyl)-3-oxo-2,3-dihydro-4-pyridazinyl]carbonyl}glycine (45 mg, 0.175 mmol, 71.8% yield), as a white solid. 1H NMR (400 MHz, DMSO-d6) d ppm 15.74 (br. s., 1H), 13.07 (s, 1H), 10.19 (t, J=5.68 Hz, 1H), 4.11 (d, J=5.81 Hz, 2H), 3.14 (sept, J=6.82 Hz, 1H), 1.17 (d, J=6.82 Hz, 6H). MS (ES+) m/e 256 [M+H]+.

Provenance & Evidence