Sodium Hydroxide → 6-[(5-Methyl-3-phenyl-isoxazol-4-ylmethyl)-amino]-nicotinic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a suspension of 6-[(5-methyl-3-phenyl-isoxazol-4-ylmethyl)-amino]-nicotinic acid methyl ester (1.86 g, 5.50 mmol) in ethanol (100 mL) was added aqueous sodium hydroxide (1 N, 17 mL, 17 mmol) and the resulting suspension was heated to 80° C. for 0.5 h. After the solution was cooled to ambient temperature the solvent was distilled off and the residue was diluted with water (50 mL) and washed with tert-butylmethylether (50 mL). The organic layers were extracted with aqueous sodium hydroxide (1 N, 20 mL) and the combined aqueous layers were acified with aqueous hydrochloric acid (25%) to pH=3 and were extracted with a mixture of ethyl acetate and methanol (4:1, 30 mL). Drying over sodium sulfate and concentration afforded the title compound (1.55 g, 91%) which was obtained as a white solid. MS: m/e=310.3 [M+H]+.

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