4-Chloroaniline → 2-(3-Bromophenyl)-6-chloro-4,4-dimethyl-1,2,3,4-tetrahydroquinoline

HRID 1036857

Reaktionsgleichung

[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([NH2:8])=[CH:4][CH:3]=1.[Br:9][C:10]1[CH:11]=[C:12]([CH:15]=[CH:16][CH:17]=1)[CH:13]=O.[CH2:18]=[C:19]([CH3:21])[CH3:20].FC(F)(F)S([O-])(=O)=O.[Yb+3].FC(F)(F)S([O-])(=O)=O.FC(F)(F)S([O-])(=O)=O>C(#N)C.C(OCC)(=O)C>[Br:9][C:10]1[CH:11]=[C:12]([CH:13]2[CH2:18][C:19]([CH3:21])([CH3:20])[C:6]3[C:5](=[CH:4][CH:3]=[C:2]([Cl:1])[CH:7]=3)[NH:8]2)[CH:15]=[CH:16][CH:17]=1

Komponenten

Reaktionsbedingungen

Temperatur: 85 °C

Versuchsvorschrift

To a stirred solution of 4-chlorophenylamine (10.0 g, 78.4 mmol) and 3-bromobenzaldehyde (9.2 mL, 78.4 mmol) in acetonitrile (150 mL) were added isobutene (21.0 mL, 313.5 mmol) and ytterbium(III) trifluoromethanesulfonate (Yb(OTf)3) (5.8 g, 9.5 mmol). The resulting mixture was stirred at 85° C. for 18 h in sealed tube. The mixture was diluted with ethyl acetate (300 mL) and washed with water (100 mL×2) and brine (100 mL×2) and then dried over anhydrous sodium sulfate. The solvent was removed in vacuo and the residue was purified by ISCO combi-flash chromatography (gradient elution, 0-10% ethyl acetate in petroleum ether) to afford 2-(3-bromo-phenyl)-6-chloro-4,4-dimethyl-1,2,3,4-tetrahydro-quinoline (11.0 g, 40.0%) as a light yellow solid: LC/MS m/e obsd. (ESI+) [(M+H)+] 350.0 & 352.0.

Aufarbeitung

washwashed with water (100 mL×2) and brine (100 mL×2)
dry with materialdried over anhydrous sodium sulfate
customThe solvent was removed in vacuo
customthe residue was purified by ISCO combi-flash chromatography (gradient elution, 0-10% ethyl acetate in petroleum ether)

Quellen und Nachweise

ORD-Eintrag: ord-09c2f1c3d63145a3be379713e6a58b08
Quelldatensatz: uspto-grants-2013_10
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US08546427B2

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