Bromoacetone → 6-(Tert-butyl-diphenyl-silanyloxymethyl)-2-methyl-imidazo[1,2-a]pyrazine

HRID 216662

Reaktionsgleichung

Reaktionsgleichung von HRID 216662
Br[CH2:2][C:3](=O)[CH3:4].[C:6]([SiH2:10][O:11][C:12]([C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1)([C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1)[C:13]1[N:14]=[CH:15][C:16]([NH2:19])=[N:17][CH:18]=1)([CH3:9])([CH3:8])[CH3:7].C([O-])(O)=O.[Na+]>COCCOC.S1(CCCC1)(=O)=O>[C:6]([SiH2:10][O:11][C:12]([C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1)([C:20]1[CH:21]=[CH:22][CH:23]=[CH:24][CH:25]=1)[C:13]1[N:14]=[CH:15][C:16]2[N:17]([CH:2]=[C:3]([CH3:4])[N:19]=2)[CH:18]=1)([CH3:9])([CH3:7])[CH3:8]

Komponenten

6

Edukt 3

HCID 11715BromoacetoneHCID 516892Sodium BicarbonateHCID 178455413HCID 178455413, Verbindung

Produkt 1

HCID 1317297536-(Tert-butyl-diphenyl-silanyloxymethyl)-2-methyl-imidazo[1,2-a]pyrazineAusbeute 40 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 80711,2-DimethoxyethaneLösungsmittelHCID 31347SulfolaneLösungsmittel

Reaktionsbedingungen

Temperatur
50 °C

Versuchsvorschrift

Bromoacetone (4.3 g, 31.4 mmol, 2.9 equiv) is added to a solution of 5-(tert-butyl-diphenyl-silanyloxymethyl)-pyrazin-2-ylamine (4.0 g, 10.7 mmol) in 1,2-dimethoxyethane (20 ml) and sulfolane (20 ml). The reaction mixture is stirred overnight at 50° C. Then a 10% aqueous solution of NaHCO3 (30 ml) is added, and the mixture is heated to reflux for 1 hour. After cooling, the mixture is extracted three times with EtOAc. The combined organic layers are washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. Purification by flash chromatography (hexane/EtOAc 3:1) affords the title compound (1.7 g, 40%). 1H NMR (400 MHz, d6-DMSO): δ=8.78 (d, J=0.9 Hz, 1H), 8.43 (d, J=1.4 Hz, 1H), 7.92 (s, 1H), 7.63-7.61 (m, 4H); 7.41-7.35 (m, 6H), 4.72 (s, 2H), 2.34 (s, 3H), 1.00 (s, 9H). MS (ES+): 402 (M+H)+.

Aufarbeitung

  1. temperaturethe mixture is heated
  2. temperatureto reflux for 1 hour
  3. temperatureAfter cooling
  4. extractionthe mixture is extracted three times with EtOAc
  5. washThe combined organic layers are washed with brine
  6. dry with materialdried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo
  9. customPurification by flash chromatography (hexane/EtOAc 3:1)

Quellen und Nachweise

ORD-Eintrag
ord-00dcd9c4425745448596a956681b4ee5
Quelldatensatz
uspto-grants-2012_06
Patentnummer
US08193236B2

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