Selenium Dioxide → Ethyl 2-formylnicotinate

HRID 497423

Reaktionsgleichung

Reaktionsgleichung von HRID 497423
[CH2:1]([O:3][C:4](=[O:12])[C:5]1[CH:10]=[CH:9][CH:8]=[N:7][C:6]=1[CH3:11])[CH3:2].[Se](=O)=[O:14]>O1CCOCC1>[CH2:1]([O:3][C:4](=[O:12])[C:5]1[CH:10]=[CH:9][CH:8]=[N:7][C:6]=1[CH:11]=[O:14])[CH3:2]

Komponenten

4

Edukt 2

HCID 24007Selenium DioxideHCID 74401Ethyl 2-methylnicotinate

Produkt 1

HCID 15639417Ethyl 2-formylnicotinateAusbeute 40,4 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 312751,4-DioxaneLösungsmittel

Versuchsvorschrift

A mixture of 11.3 g (0.069 mol) of 2-methyl-nicotinic acid ethyl ester and 8.4 g (0.076 mol) of selenium dioxide in 150 mL of dioxane is refluxed under nitrogen for 4 hours. The reaction mixture is cooled to room temperature and filtered. The filtrate is evaporated and the residue is chromatographed on 400 grams of silica gel using 50/50 ethyl acetate/hexanes as the eluant. Appropriate fractions are combined to yield 5 g of 2-formyl-nicotinic acid ethyl ester. 1H NMR (CDCl3) δ 10.3 (s, 1H), 8.8 (m, 1H), 8.0 (m, 1H), 7.5 (m, 1H), 4.30 (q, 2H), 1.4 (t, 3H). TLC (7/3 hexanes/ethyl acetate) Rf=0.2. Step 2:

Aufarbeitung

  1. temperatureis refluxed under nitrogen for 4 hours
  2. filtrationfiltered
  3. customThe filtrate is evaporated
  4. customthe residue is chromatographed on 400 grams of silica gel using 50/50 ethyl acetate/hexanes as the eluant

Quellen und Nachweise

ORD-Eintrag
ord-2fed7c86b2fa4d0f8752b4cfc0e491bd
Quelldatensatz
uspto-grants-2005_09
Patentnummer
US06949562B2

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