Hydrochloric Acid → Diethyl 1,6-dihydro-5-nitro-6-oxo-2,3-pyridinedicarboxylate

HRID 742198

Reaktionsgleichung

Reaktionsgleichung von HRID 742198
[CH2:1]([O:3][C:4](=[O:17])[C:5](=[CH:13]OCC)[C:6]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=O)[CH3:2].[N+:18]([CH2:21][C:22]([NH2:24])=[O:23])([O-:20])=[O:19].C([O-])(=O)C.[Na+].Cl>C(O)C>[N+:18]([C:21]1[C:22](=[O:23])[NH:24][C:6]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[C:5]([C:4]([O:3][CH2:1][CH3:2])=[O:17])[CH:13]=1)([O-:20])=[O:19]

Komponenten

6

Edukt 4

HCID 313Hydrochloric AcidHCID 40590Diethyl 2-(ethoxymethylidene)-3-oxobutanedioateHCID 2792562-NitroacetamideHCID 517045Sodium Acetate

Produkt 1

HCID 19958208Diethyl 1,6-dihydro-5-nitro-6-oxo-2,3-pyridinedicarboxylateAusbeute 79,3 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 702EthanolLösungsmittel2×

Reaktionsbedingungen

Temperatur
0 °C

Versuchsvorschrift

Diethyl(ethoxymethylene)oxalacetate (5.63 g. 0.023 mol,) is dissolved under N2 atmosphere in 20 mL of absolute ethanol and cooled to 0° C. Nitroacetamide (2.00 g, 0.019 mol,) (S. K. Brownstein, J. Org. Chem 23, 113 (1958)) and sodium acetate (1.56 g, 0.019 mol,) are added and the mixture is stirred at room temperature for 15 hours. The suspension is diluted with 15 mL of absolute ethanol and acidified to pH 2 with concentrated HCl. The inorganics are removed by filtration and the filtrate is concentrated to an oily solid which is gravity chromatographed, first with methylene chloride and then 2% methanol in methylene chloride. The fractions are combined and stripped to give 4.28 g of the title product as a yellow solid, 78.4% yield, melting point 144°-145° C.

Aufarbeitung

  1. customThe inorganics are removed by filtration
  2. concentrationthe filtrate is concentrated to an oily solid which
  3. customchromatographed, first with methylene chloride

Quellen und Nachweise

ORD-Eintrag
ord-8dd4766138804e1c906ae98d965d4d3f
Quelldatensatz
uspto-grants-1996_09
Patentnummer
US05554579

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