Sodium Carbonate → 5-(5-Methyl-3-phenyl-isoxazol-4-ylmethoxy)-pyrazine-2-carboxylic acid

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Reaktionsgleichung

C[O:2][C:3]([C:5]1[CH:10]=[N:9][C:8]([O:11][CH2:12][C:13]2[C:14]([C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=3)=[N:15][O:16][C:17]=2[CH3:18])=[CH:7][N:6]=1)=[O:4].[OH-].[Na+].C(=O)([O-])[O-].[Na+].[Na+]>C(O)C>[CH3:18][C:17]1[O:16][N:15]=[C:14]([C:19]2[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=2)[C:13]=1[CH2:12][O:11][C:8]1[N:9]=[CH:10][C:5]([C:3]([OH:4])=[O:2])=[N:6][CH:7]=1

Komponenten

Reaktionsbedingungen

Temperatur: 60 °C

Versuchsvorschrift

To a solution of 5-(5-methyl-3-phenyl-isoxazol-4-ylmethoxy)-pyrazine-2-carboxylic acid methyl ester (1.00 g, 3.07 mmol) (1.0 g, 1.69 mmol) in ethanol (10 mL) was added aqueous sodium hydroxide (1 N, 6.2 mL). After heating at 60° C. for 30 min it was cooled to ambient temperature and aqueous sodium carbonate (2 M, 50 mL) added. Addition of aqueous sodium hydroxide (1 M, 50 mL) was followed by extraction with tert-butylmethylether. The aqueous phase was acidified with aqueous hydrogen chloride (25%) to pH=2 and extracted with tert-butylmethylether and ethyl acetate. The combined organic layers were dried over sodium sulfate and concentration afforded the title compound (450 mg, 86%) as a white foam. MS: m/e=310.5 [M−H]−.

Aufarbeitung

temperaturewas cooled to ambient temperature
extractionwas followed by extraction with tert-butylmethylether
extractionextracted with tert-butylmethylether and ethyl acetate
dry with materialThe combined organic layers were dried over sodium sulfate and concentration

Quellen und Nachweise

ORD-Eintrag: ord-c96772afa5724dd7b1aa3604164d039e
Quelldatensatz: uspto-grants-2009_11
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US07618973B2

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