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

HRID 2090378Notes

Reaction equation

HRID 2090378 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+]>C(#N)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]([CH2:16][C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])[CH:10]=2)[O:3]1

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 6342AcetonitrileSolvent

Procedure

To a solution of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (400 mg, 0.002 mol, Aldrich, Cat. No. 525057) in acetonitrile (10 mL) was added tert-butyl 2-bromoacetate (0.36 mL, 0.0025 mol, Aldrich, Cat. No. 124230) and cesium carbonate (1.0 g, 0.0031 mol). The suspension was stirred at r.t. overnight. The reaction mixture was partitioned with AcOEt and water. The organic layer was separated, washed with water and brine, dried over MgSO4. After filtration, the filtrate was concentrated to afford the desired compound which was directly used in the next step reaction without further purification. LCMS (M+H)+: m/z=309.1.

Workup

  1. customThe reaction mixture was partitioned with AcOEt and water
  2. customThe organic layer was separated
  3. washwashed with water and brine
  4. dry with materialdried over MgSO4
  5. filtrationAfter filtration
  6. concentrationthe filtrate was concentrated

Sources & evidence

ORD record
ord-5a05e68363864244bb6aaf1ed41af1f5
Source dataset
uspto-grants-2013_05
Patent number
US08436008B2

Reaction notes

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