Diethyl (ethoxymethylene)malonate → ethyl 6,7-dihydro-9-(N,N-dimethylamino)-5-methyl-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylate

HRID 597519

Reaktionsgleichung

[CH3:1][N:2]([C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][CH:13]=1)[NH:10][CH:9]([CH3:14])[CH2:8][CH2:7]2)[CH3:3].C([O:17][CH:18]=[C:19]([C:25](OCC)=O)[C:20]([O:22][CH2:23][CH3:24])=[O:21])C.[OH-].[Na+]>O>[CH3:3][N:2]([C:4]1[CH:13]=[C:12]2[C:11]3[N:10]([CH:25]=[C:19]([C:20]([O:22][CH2:23][CH3:24])=[O:21])[C:18]2=[O:17])[CH:9]([CH3:14])[CH2:8][CH2:7][C:6]=3[CH:5]=1)[CH3:1]

Komponenten

Reaktionsbedingungen

Temperatur: 120 °C

Versuchsvorschrift

6-(N,N-Dimethylamino)-2-methyltetrahydroquinoline (25 g., 0.132 mole) is mixed with diethyl ethoxymethylenemalonate (28.4 g., 0.132 mole), and the mixture is heated at 120° C. for three hours. Polyphosphoric acid (200 g.) is added, and the solution is heated gradually to 120° C. with occasional stirring. The solution is maintained at 120° to 130° C. for one hour then poured into 500 ml. of water, with stirring. The solution is neutralized with 40 percent sodium hydroxide solution. The yellow product is separated by filtration and recrystallized from ethanol giving ethyl 6,7-dihydro-9-(N,N-dimethylamino)-5-methyl-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylate, m.p. 219°-222° C.

Aufarbeitung

temperaturethe solution is heated gradually to 120° C. with occasional stirring
temperatureThe solution is maintained at 120° to 130° C. for one hour
additionthen poured into 500 ml
customThe yellow product is separated by filtration
customrecrystallized from ethanol

Quellen und Nachweise

ORD-Eintrag: ord-00d89f24a4d24e4a9fcfac1d7be2fdb7
Quelldatensatz: uspto-grants-1977_03
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US04014877

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