Iodoethane → 2-Ethoxy-4-fluorobenzaldehyde
Reaktionsgleichung
C(OC(=O)C(OCC)CC1C=CC(O)=CC=1C)C.[CH2:19]([O:21][C:22]1[CH:27]=[C:26]([F:28])[CH:25]=[CH:24][C:23]=1[C:29]1[O:30]C(C)=C(CCO)N=1)[CH3:20].C(I)C.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O>[CH2:19]([O:21][C:22]1[CH:27]=[C:26]([F:28])[CH:25]=[CH:24][C:23]=1[CH:29]=[O:30])[CH3:20]Komponenten
Edukt 4
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
In analogy to the procedure described in example 7 c], [rac]-2-ethoxy-3-(4-hydroxy-2-methyl-phenyl)-propionic acid ethyl ester (example 34 b]) was reacted with 2-[2-(2-ethoxy-4-fluoro-phenyl)-5-methyl-oxazol-4-yl]-ethanol (prepared from 4-fluoro-2-hydroxy-benzaldehyde [J. Chem. Soc., Perkin Trans. 1 (1994), (13), 1823-31] by i) treatment with ethyl iodide, potassium carbonate in N,N-dimethylformamide to give 2-ethoxy-4-fluoro-benzaldehyde; ii) conversion of 2-ethoxy-4-fluoro-benzaldehyde into 4-chloromethyl-2-(2-ethoxy-4-fluoro-phenyl)-5-methyl-oxazole in analogy to the procedures described in examples 2 a] and b]; iii) conversion of 4-chloromethyl-2-(2-ethoxy-4-fluoro-phenyl)-5-methyl-oxazole into 2-[2-(2-ethoxy-4-fluoro-phenyl)-5-methyl-oxazol-4-yl]-ethanol by treatment with sodium cyanide in DMSO followed by hydrolysis of the nitrile function with sodium hydroxide in ethanol/water at reflux and reduction of the acid formed with BH3xTHF in tetrahydrofuran at room temperature) in the presence of triphenylphosphine and diethyl azodicarboxylate to yield [rac]-2-ethoxy-3-(4-{2-[2-(2-ethoxy-4-fluoro-phenyl)-5-methyl-oxazol-4-yl]-ethoxy}-2-methyl-phenyl)-propionic acid ethyl ester as light yellow liquid.
Quellen und Nachweise
- ORD-Eintrag
- ord-6d83adfe9b7046b48c0c2487e9a436d6
- Quelldatensatz
- uspto-grants-2008_03
- Patentnummer
- US07348349B2
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