Glycine → {[7-Hydroxy-3-(4-methoxy-phenyl)-4-phenyl-isoxazolo[4,5-c]pyridine-6-carbonyl]-amino}-acetic acid

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Reaction Steps

Ethyl 7-hydroxy-3-(4-methoxyphenyl)-4-phenylisoxazolo[4,5-c]pyridine-6-carboxylate (70 mg, 0.18 mmol) and glycine (539 mg, 7.18 mmol) were added to sodium methoxide solution (10.8 mL, 5.38 mmol, 0.5 M in MeOH) and the mixture was refluxed for 3 days. The mixture was cooled to room temperature and the solvent was removed in vacuo. The residue was dissolved in minimum amount of water and 0.25 M hydrochloric acid was added until pH was 3. The precipitate was isolated by filtration and dried under vacuum to give 79 mg of crude solid. The solid was dissolved in 15 mL of saturated sodium bicarbonate solution and washed with hexanes and EtOAc. The aqueous layer was acidified to pH 3 with concentrated hydrochloric acid and the precipitate was collected by filtration. The solid was dried under vacuum to afford 47 mg of the title compound. MS: (+) m/z 420.37 (M+1).

Provenance & Evidence