Cesium carbonate → tert-Butyl 3-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)methyl)phenylcarbamate

HRID 2175257

Reaktionsgleichung

Reaktionsgleichung von HRID 2175257
[CH3:1][C:2]1([CH3:14])[C:6]([CH3:8])([CH3:7])[O:5][B:4]([C:9]2[CH:10]=[N:11][NH:12][CH:13]=2)[O:3]1.C(=O)([O-])[O-].[Cs+].[Cs+].Br[CH2:22][C:23]1[CH:24]=[C:25]([NH:29][C:30](=[O:36])[O:31][C:32]([CH3:35])([CH3:34])[CH3:33])[CH:26]=[CH:27][CH:28]=1>C(#N)C.C(OCC)(=O)C>[CH3:1][C:2]1([CH3:14])[C:6]([CH3:7])([CH3:8])[O:5][B:4]([C:9]2[CH:13]=[N:12][N:11]([CH2:22][C:23]3[CH:24]=[C:25]([NH:29][C:30](=[O:36])[O:31][C:32]([CH3:34])([CH3:33])[CH3:35])[CH:26]=[CH:27][CH:28]=3)[CH:10]=2)[O:3]1

Komponenten

6

Edukt 3

HCID 10796Cesium carbonateHCID 27740104-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazoleHCID 14523558tert-Butyl 3-(bromomethyl)phenylcarbamate

Produkt 1

HCID 70983056tert-Butyl 3-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)methyl)phenylcarbamateAusbeute 59 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 6342AcetonitrileLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

To a solution of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.88 g, 4.54 mmol) in acetonitrile (20 mL) was added cesium carbonate (4.43 g, 13.61 mmol) and tert-butyl 3-(bromomethyl)phenylcarbamate (1.298 g, 4.54 mmol). The reaction was stirred at room temperature for 3 h. After this time, the reaction mixture was diluted with ethyl acetate and washed with water and brine. The aqueous phase was extracted with CHCl3. The combined organic layer was dried over anhydrous MgSO4, filtered, and concentrated. The resulting residue was purified by (0-100% ethyl acetate:hexanes) to afford the title compound (1.06 g, 2.65 mmol, 59% yield) as a colorless oil. LCMS, [M+H]+=400.3.

Aufarbeitung

  1. washwashed with water and brine
  2. extractionThe aqueous phase was extracted with CHCl3
  3. dry with materialThe combined organic layer was dried over anhydrous MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe resulting residue was purified by (0-100% ethyl acetate:hexanes)

Quellen und Nachweise

ORD-Eintrag
ord-f0ebad78e4424741ba89cd3b973db86b
Quelldatensatz
uspto-grants-2015_06
Patentnummer
US09062028B2

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