반응 #1124065

반응 방정식

4-amino-3-chloro-benzonitrile

3-bromobenzaldehyde

isobutene

ytterbium(III) trifluoromethanesulfonate

→

2-(3-bromo-phenyl)-8-chloro-4,4-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carbonitrile

수율 40.0%

용매

acetonitrile

ethyl acetate

반응 조건

후처리

1. 1
   세척washed with water (100 mL×2) and brine (100 mL×2)
2. 2
   건조dried over anhydrous sodium sulfate
3. 3
   기타The solvent was removed in vacuo
4. 4
   기타the residue was purified by ISCO combi-flash chromatography (gradient elution, 10-50% ethyl acetate in petroleum ether)

실험 절차

To a stirred solution of 4-amino-3-chloro-benzonitrile (8.0 g, 52.4 mmol) and 3-bromobenzaldehyde (6.2 mL, 52.4 mmol) in acetonitrile (150 mL) were added isobutene (14.7 mL, 209.7 mmol) and ytterbium(III) trifluoromethanesulfonate (Yb(OTf)3) (4.0 g, 6.3 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)-8-chloro-4,4-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carbonitrile (7.8 g, 40.0%) as a light yellow solid: LC/MS m/e obsd. (ESI+) [(M+H)+] 374.9 & 376.9.

출처