Sodium Bicarbonate → 4-chloro-7-methylfuro-[3,4-b]-pyridin-5-(7H)-one

HRID 2372183Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2372183
[Cl:1][C:2]1[C:7]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[C:6](C(Br)C)[N:5]=[CH:4][CH:3]=1.C(=O)(O)[O-].[Na+]>CS(C)=O.O>[Cl:1][C:2]1[CH:3]=[CH:4][N:5]=[C:6]2[CH:11]([CH3:12])[O:10][C:8](=[O:9])[C:7]=12

Komponenten

5

Edukt 2

HCID 516892Sodium BicarbonateHCID 19902854Ethyl 4-chloro-2-(1-bromoethyl)nicotinate

Produkt 1

HCID 199028524-chloro-7-methylfuro-[3,4-b]-pyridin-5-(7H)-one

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 679Dimethyl SulfoxideLösungsmittelHCID 962WaterLösungsmittel

Versuchsvorschrift

A mixture of ethyl 4-chloro-2-(1-bromoethyl)nicotinate (7.45 g) and sodium bicarbonate (4.00 g) in 50 ml of DMSO is heated at 120°, under nitrogen, for 2 hours, after which it is cooled, diluted with water, filtered and extracted with ether. The combined organic layers are washed with water and concentrated. The residue is taken into ethyl acetate, washed with brine, dried, concentrated and purified by flash chromatography to give 4-chloro-7-methylfuro-[3,4-b]-pyridin-5-(7H)-one, which is then reacted with N-bromosuccinimide and 2,2'-azobis(2-methylpropionitrile), as above, to give 7-bromo-4-chloro-7-methylfuro-[3,4-b]-pyridin-5-(7H)-one.

Aufarbeitung

  1. temperatureis heated at 120°, under nitrogen, for 2 hours
  2. temperatureafter which it is cooled
  3. filtrationfiltered
  4. extractionextracted with ether
  5. washThe combined organic layers are washed with water
  6. concentrationconcentrated
  7. washwashed with brine
  8. customdried
  9. concentrationconcentrated
  10. custompurified by flash chromatography

Quellen und Nachweise

ORD-Eintrag
ord-577f714f52a74b5ebae5ea0ca3fb61ad
Quelldatensatz
uspto-grants-1992_03
Patentnummer
US05098462

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