Hydrochloric Acid → Imidazo-[1,2-a]quinoxaline-2-methanol

HRID 1155995Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1155995
[CH:1]1[N:5]2[C:6]3[C:11]([N:12]=[CH:13][C:4]2=[N:3][C:2]=1[C:14](OCC)=[O:15])=[CH:10][CH:9]=[CH:8][CH:7]=3.[BH4-].[Li+].Cl.C(=O)(O)[O-].[Na+]>O1CCCC1>[CH:1]1[N:5]2[C:6]3[C:11]([N:12]=[CH:13][C:4]2=[N:3][C:2]=1[CH2:14][OH:15])=[CH:10][CH:9]=[CH:8][CH:7]=3

Komponenten

6

Edukt 4

HCID 313Hydrochloric AcidHCID 516892Sodium BicarbonateHCID 4148881Lithium borohydrideHCID 13228325Ethyl imidazo[1,2-a]quinoxaline-2-carboxylate

Produkt 1

HCID 13770472Imidazo-[1,2-a]quinoxaline-2-methanolAusbeute 82,4 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

A solution of 7.2 g of ethyl imidazo-[1,2-a]-quinoxaline-2-carboxylate in 140 ml of anhydrous tetrahydrofuran and 1.0 g of lithium borohydride was refluxed with stirring for 20 hours and was then cooled to room temperature. 2 N hydrochloric acid was added dropwise to the mixture until effervescence ceased and the clear solution was stirred for one hour and made alkaline with saturated sodium bicarbonate solution. The mixture was concentrated under reduced pressure to evaporate the tetrahydrofuran and the mixture was poured into 500 ml of water. The mixture was cooled in an ice bath and filtered to obtain 4.9 g of imidazo-[1,2-a]-quinoxaline-2-methanol in the form of a colorless solid. The filtrate was extracted with chloroform and the organic phase was dried over magnesium sulfate and evaporated to dryness to obtain an additional 0.60 g of the desired compound in the form of needles melting at 158°-159° C. after crystallization from an ether-ethyl acetate mixture.

Aufarbeitung

  1. stirringthe clear solution was stirred for one hour
  2. concentrationThe mixture was concentrated under reduced pressure
  3. customto evaporate the tetrahydrofuran
  4. additionthe mixture was poured into 500 ml of water
  5. temperatureThe mixture was cooled in an ice bath
  6. filtrationfiltered

Quellen und Nachweise

ORD-Eintrag
ord-54ebbc9b9e0f4f53bbdde68235986376
Quelldatensatz
uspto-grants-1982_06
Patentnummer
US04333934

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