Water → 2-(3-Bromo-5-chloro-phenyl)-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester

HRID 2045278Notes

Reaction equation

[CH2:1]([O:3][C:4](=[O:21])[C:5]1[CH:10]=[CH:9][C:8]([N:11]=[CH:12][C:13]2[CH:18]=[C:17]([Cl:19])[CH:16]=[C:15]([Br:20])[CH:14]=2)=[CH:7][CH:6]=1)[CH3:2].O.[O-]S(C(F)(F)F)(=O)=O.[Yb+3].[O-]S(C(F)(F)F)(=O)=O.[O-]S(C(F)(F)F)(=O)=O.[CH:48](=[O:52])[CH:49]([CH3:51])[CH3:50].O>O1CCCC1>[CH2:1]([O:3][C:4]([C:5]1[CH:10]=[C:9]2[C:8](=[CH:7][CH:6]=1)[NH:11][CH:12]([C:13]1[CH:18]=[C:17]([Cl:19])[CH:16]=[C:15]([Br:20])[CH:14]=1)[C:49]([CH3:51])([CH3:50])[CH:48]2[OH:52])=[O:21])[CH3:2]

Participants

Conditions

Temperature: 25 °C

Procedure

To a mixture of 4-{[1-(3-bromo-5-chloro-phenyl)-methylidene]-amino}-benzoic acid ethyl ester (6.4 g, 17.5 mmol) and ytterbium(III) triflate hydrate (1.08 g, 1.75 mmol) in dry tetrahydrofuran (50 mL) at 25° C. was added isobutyraldehyde (1.59 mL, 17.5 mmol) and water (0.32 mL, 17.5 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-(3-bromo-5-chloro-phenyl)-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (7.67 g, 100%) as a light yellow oil: LC/MS m/e calcd for C20H21BrClNO3 M+: 438.8, observed: 438.8, 440.8.

Workup

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

Sources & evidence

ORD record: ord-10d9c5cff0da451ba8cd77f5df568b09
Source dataset: uspto-grants-2013_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08586747B2

Reaction notes

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