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

HRID 500197Notes

Reaction equation

HRID 500197 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.Br[CH2:16][C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18].C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C)C=O>[C:20]([O:19][C:17](=[O:18])[CH2:16][N:12]1[CH:13]=[C:9]([B:4]2[O:5][C:6]([CH3:7])([CH3:8])[C:2]([CH3:14])([CH3:1])[O:3]2)[CH:10]=[N:11]1)([CH3:23])([CH3:22])[CH3:21]

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 79177tert-Butyl bromoacetateHCID 27740104-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

Product 1

HCID 59216326tert-Butyl 2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)acetate

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (1.5 g, 7.7 mmol) in N,N-dimethylformamide (25 mL) was added tert-butyl 2-bromoacetate (1.2 mL, 8.5 mmol) and cesium carbonate (3.8 g, 0.012 mol). The suspension was stirred overnight at RT and partitioned with EtOAc and water. The organic phase was washed with brine, dried with MgSO4, filtered, and concentrated to afford the desired compound which was directly used in next step. LCMS: (M+H)=309.4.

Workup

  1. custompartitioned with EtOAc and water
  2. washThe organic phase was washed with brine
  3. dry with materialdried with MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-b6c0e25b25c1446fbdfc3b73f644d679
Source dataset
uspto-grants-2010_08
Patent number
US07767675B2

Reaction notes

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