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

Reaction equation

HRID 2175257 reaction equation
[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

Participants

6

Reactant 3

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

Product 1

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

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Procedure

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.

Workup

  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)

Sources & evidence

ORD record
ord-f0ebad78e4424741ba89cd3b973db86b
Source dataset
uspto-grants-2015_06
Patent number
US09062028B2

Linked notes

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