Water → HCID 67439880, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 4-{[1-(4-bromo-phenyl)-methylidene]-amino}-benzoic acid ethyl ester (9.8 g, 29.5 mmol) and ytterbium(III) triflate hydrate (1.83 g, 2.95 mmol) in dry tetrahydrofuran (20 mL) at 25° C. was added isobutyraldehyde (2.1 g, 29.5 mmol) and water (0.53 mL, 29.5 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-(4-bromo-phenyl)-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (11.9 g, 100%) as a light yellow oil: LC/MS m/e calcd for C20H22BrNO3 M+: 404.3, observed: 404.1, 406.1.

Provenance & Evidence