Triethyl Phosphate → Ethyl 1-ethyl-7,8-dimethoxy-4-oxo-1,4-dihydroquinoline-3-carboxylate

HRID 525949Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 525949
[CH3:1][O:2][C:3]1[C:12]([O:13][CH3:14])=[C:11]2[C:6]([C:7](=[O:20])[C:8]([C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:9][NH:10]2)=[CH:5][CH:4]=1.C(=O)([O-])[O-].[K+].[K+].P(OCC)(OCC)(O[CH2:30][CH3:31])=O>O>[CH2:30]([N:10]1[C:11]2[C:6](=[CH:5][CH:4]=[C:3]([O:2][CH3:1])[C:12]=2[O:13][CH3:14])[C:7](=[O:20])[C:8]([C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:9]1)[CH3:31]

Komponenten

5

Edukt 3

HCID 6535Triethyl PhosphateHCID 11430Potassium CarbonateHCID 86732817Ethyl 4-hydroxy-7,8-dimethoxyquinoline-3-carboxylate

Produkt 1

HCID 15675313Ethyl 1-ethyl-7,8-dimethoxy-4-oxo-1,4-dihydroquinoline-3-carboxylateAusbeute 59 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Reaktionsbedingungen

Temperatur
120 °C

Versuchsvorschrift

A mixture of ethyl 7,8-dimethoxy-4-oxo-1,4-dihydroquinoline-3-carboxylate (40 g, 144 mmol) and potassium carbonate (29.9 g, 216 mmol) in triethyl phosphate (123 ml, 721 mmol) was stirred at 120° C. for 24 h. LCMS indicated completion of the reaction. The reaction mixture was cooled down to rt and diluted with water, extracted with DCM, dried over sodium sulfate and evaporated in vacuo. The crude material was recrystallized in EtOH, the precipitate was collected by filtration, washed by cold EtOH and dried in air to afford ethyl 1-ethyl-7,8-dimethoxy-4-oxo-1,4-dihydroquinoline-3-carboxylate (26 g, 85 mmol, 59.0% yield) as a yellow solid. LCMS: (M+H)+: 306.2.

Aufarbeitung

  1. customcompletion of the reaction
  2. temperatureThe reaction mixture was cooled down to rt
  3. extractionextracted with DCM
  4. dry with materialdried over sodium sulfate
  5. customevaporated in vacuo
  6. customThe crude material was recrystallized in EtOH
  7. filtrationthe precipitate was collected by filtration
  8. washwashed by cold EtOH
  9. customdried in air

Quellen und Nachweise

ORD-Eintrag
ord-7090ebedfdb8456c86d6328edb9893ff
Quelldatensatz
uspto-grants-2016_05
Patentnummer
US09340556B2

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