Water → 4-Hydroxy-2-(3-methoxy-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid methyl ester

HRID 2045396Notes

Reaction equation

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

Participants

Conditions

Temperature: 25 °C

Procedure

To a stirred mixture solution of 4-[(3-methoxy-benzylidene)-amino]-benzoic acid methyl ester (2.7 g, 10.0 mmol) and ytterbium(III) triflate hydrate (620.3 mg, 1.0 mmol) in dry tetrahydrofuran (10 mL) at 25° C. was added isobutyraldehyde (0.93 mL, 10.2 mmol) and water (0.2 mL, 10.2 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 4-hydroxy-2-(3-methoxy-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid methyl ester (3.4 g, quant.) as a light yellow oil which was used for next step without further purification: LC/MS m/e calcd for C20H23NO4 (M+H)+: 342.41, observed: 324.2 & 342.2.

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-1b66584f3ddf448a8bf96e8d5f271282
Source dataset: uspto-grants-2013_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08586747B2

Reaction notes

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