Water → HCID 67440876, Verbindung

Temperatur

25 °C

To a mixture of 4-{[1-(5-bromo-2-fluoro-phenyl)-methylidene]-amino}-benzoic acid ethyl ester (2.76 g, 7.9 mmol) and ytterbium(III) triflate hydrate (0.49 g, 0.79 mmol) in dry tetrahydrofuran (10 mL) at 25° C. was added isobutyraldehyde (0.72 mL, 7.9 mmol) and water (0.14 mL, 7.9 mmol) dropwise. The reaction mixture was stirred at 25° C. for 5 h. Then the reaction mixture was concentrated in vacuo and the residue was extracted with ethyl acetate (2×100 mL), washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo to afford 2-(5-bromo-2-fluoro-phenyl)-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (3.33 g, 100%) as a light yellow oil: LC/MS m/e calcd for C20H21BrFNO3 M+: 422.3, observed: 404.2, 406.2.

1. concentrationThen the reaction mixture was concentrated in vacuo
2. extractionthe residue was extracted with ethyl acetate (2×100 mL)
3. washwashed with brine
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo

ORD-Eintrag

ord-ba551c5539944448b31ecf81520e7afe

Quelldatensatz

uspto-grants-2013_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08344137B2