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

HRID 1801161Notes

Reaction equation

[CH3:1][O:2][C:3](=[O:20])[C:4]1[CH:9]=[C:8]([N:10]=[CH:11][C:12]2[CH:17]=[CH:16][CH:15]=[C:14]([Br:18])[CH:13]=2)[CH:7]=[CH:6][C:5]=1[F:19].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:47](=[O:51])[CH:48]([CH3:50])[CH3:49].O>O1CCCC1>[CH3:1][O:2][C:3]([C:4]1[C:9]2[CH:47]([OH:51])[C:48]([CH3:50])([CH3:49])[CH:11]([C:12]3[CH:17]=[CH:16][CH:15]=[C:14]([Br:18])[CH:13]=3)[NH:10][C:8]=2[CH:7]=[CH:6][C:5]=1[F:19])=[O:20]

Participants

Conditions

Temperature: 25 °C

Procedure

To a stirred mixture solution of 5-[(3-bromo-benzylidene)-amino]-2-fluoro-benzoic acid methyl ester (51.7 g, 153.8 mmol) and ytterbium(III) triflate hydrate (14.3 g, 23.1 mmol) in dry tetrahydrofuran (100 mL) at 25° C. was added isobutyraldehyde (14 mL, 153.8 mmol) and water (2.8 mL, 153.8 mmol) dropwise. The reaction mixture was stirred at 25° C. for 16 h. Then the reaction mixture was concentrated in vacuo and the residue was extracted with ethyl acetate (2×200 mL), washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo to afford 2-(3-bromo-phenyl)-6-fluoro-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-5-carboxylic acid methyl ester (63.0 g, quant.) as a light yellow oil which was used for next step without further purification: LC/MS m/e calcd for C19H19BrFNO3 (M+H)+: 409.27, observed: 390.0 & 392.0.

Workup

concentrationThen the reaction mixture was concentrated in vacuo
extractionthe residue was extracted with ethyl acetate (2×200 mL)
washwashed with brine
dry with materialdried over anhydrous sodium sulfate
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-e7a8d94691e849a8bbe5ca977d6c1d24
Source dataset: uspto-grants-2013_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08344137B2

Reaction notes

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