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Sodium hydride → (S)-tert-butyl 2-(6-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate

HRID 625568
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Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 625568
[H-].[Na+].[Br:3][C:4]1[N:9]=[C:8]2[NH:10][C:11]([C@@H:13]3[CH2:17][CH2:16][CH2:15][N:14]3[C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])=[N:12][C:7]2=[N:6][CH:5]=1.[CH3:25][Si:26]([CH2:29][CH2:30][O:31][CH2:32]Cl)([CH3:28])[CH3:27]>CN(C=O)C.O.CCOC(C)=O>[Br:3][C:4]1[N:9]=[C:8]2[N:10]=[C:11]([C@@H:13]3[CH2:17][CH2:16][CH2:15][N:14]3[C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[N:12]([CH2:32][O:31][CH2:30][CH2:29][Si:26]([CH3:28])([CH3:27])[CH3:25])[C:7]2=[N:6][CH:5]=1.[Br:3][C:4]1[N:9]=[C:8]2[N:10]([CH2:32][O:31][CH2:30][CH2:29][Si:26]([CH3:28])([CH3:27])[CH3:25])[C:11]([C@@H:13]3[CH2:17][CH2:16][CH2:15][N:14]3[C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])=[N:12][C:7]2=[N:6][CH:5]=1
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Komponenten

8

Edukt 3

HCID 24758Sodium hydrideHCID 27242712-Chloromethyl 2-(trimethylsilyl)ethyl etherHCID 58498842(S)-tert-butyl 2-(6-bromo-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate

Produkt 2

HCID 58498762(S)-tert-butyl 2-(6-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate
HCID 58498888
(S)-tert-butyl 2-(5-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 962WaterLösungsmittelHCID 6228DimethylformamideLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

A 60% dispersion of NaH (75 mg, 1.9 mmol) was added to a stirred solution of (S)-tert-butyl 2-(6-bromo-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate (627 mg, 1.70 mmol) in DMF (15 mL) and the reaction was stirred for 1.5 h at room temperature. Then SEM-Cl (0.30 mL, 1.7 mmol) was added and the reaction was stirred overnight. The reaction was diluted with water (˜30 mL) and EtOAc (˜35 mL), the layers were separated and the organic layer was washed with brine (30 mL), dried (MgSO4), filtered and concentrated. The crude yellow oil was purified by flash chromatography (40 g SiO2, 20-30% EtOAc/hexanes) to yield (S)-tert-butyl 2-(5-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate (421 mg) as a clear colorless oil and (S)-tert-butyl 2-(6-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate (345 mg) as a clear colorless oil. The absolute regiochemistry of the SEM group was not established unambiguously, the names (and structures) may be exchanged in these intermediates.

Aufarbeitung

  1. stirringthe reaction was stirred overnight
  2. customthe layers were separated
  3. washthe organic layer was washed with brine (30 mL)
  4. dry with materialdried (MgSO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude yellow oil was purified by flash chromatography (40 g SiO2, 20-30% EtOAc/hexanes)

Quellen und Nachweise

ORD-Eintrag
ord-9d1b0109f8864e65b4cfad2411425e82
Quelldatensatz
uspto-grants-2016_04
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US09303007B2

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