Water → HCID 67440510, compound

HRID 1801236Notes

Reaction equation

[CH2:1]([O:3][C:4](=[O:19])[C:5]1[CH:10]=[CH:9][C:8]([N:11]=[CH:12][C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][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:46](=[O:50])[CH:47]([CH3:49])[CH3:48].O>O1CCCC1>[CH2:1]([O:3][C:4]([C:5]1[CH:6]=[C:7]2[C:8](=[CH:9][CH:10]=1)[NH:11][CH:12]([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[C:47]([CH3:49])([CH3:48])[CH:46]2[OH:50])=[O:19])[CH3:2]

Participants

Conditions

Temperature: 25 °C

Procedure

To a mixture of 4-(benzylidene-amino)-benzoic acid ethyl ester (5.1 g, 20.0 mmol) and ytterbium(III) triflate hydrate (1.3 g, 2.0 mmol) in dry tetrahydrofuran (20.0 mL) at 25° C. was added isobutyraldehyde (18.2 mL, 200 mmol) and water (0.36 mL, 20.0 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-3,3-dimethyl-2-phenyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (6.6 g, quant.) as a light yellow oil which was used for next step without further purification: LC/MS m/e calcd for C20H23NO3 (M+H)+: 326.40, observed: 308.0.

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-eb0ab9a0a23643e4a0f08792c1970e9f
Source dataset: uspto-grants-2013_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08344137B2

Reaction notes

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