Isobutylene → 7-Quinolinecarboxylic acid, 2-(3-bromophenyl)-1,2,3,4-tetrahydro-4,4-dimethyl-, methyl ester

HRID 2408080Notes

Reaction equation

[CH3:1][O:2][C:3](=[O:11])[C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([NH2:10])[CH:5]=1.[Br:12][C:13]1[CH:14]=[C:15]([CH:18]=[CH:19][CH:20]=1)[CH:16]=O.[CH2:21]=[C:22]([CH3:24])[CH3:23].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>[CH3:1][O:2][C:3]([C:4]1[CH:5]=[C:6]2[C:7]([C:22]([CH3:24])([CH3:23])[CH2:21][CH:16]([C:15]3[CH:18]=[CH:19][CH:20]=[C:13]([Br:12])[CH:14]=3)[NH:10]2)=[CH:8][CH:9]=1)=[O:11]

Participants

Conditions

Temperature: 85 °C

Procedure

To a stirred solution of 3-amino-benzoic acid methyl ester (11.3 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, 10-50% ethyl acetate in petroleum ether) to afford 2-(3-bromo-phenyl)-4,4-dimethyl-1,2,3,4-tetrahydro-quinoline-7-carboxylic acid methyl ester (11.7 g, 40.0%) as a light yellow solid: MS (ESI) M+1=374.

Workup

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, 10-50% ethyl acetate in petroleum ether)

Sources & evidence

ORD record: ord-10d6bf9da24d4c56a3fea62f71462dd9
Source dataset: uspto-grants-2014_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08809369B2

Reaction notes

Loading…