Pyridine → 1-phenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

HRID 1962731Notes

Reaction equation

HRID 1962731 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:15]1(B(O)O)[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.CN(C=O)C.N1C=CC=CC=1>C(OCC)(=O)C.C([O-])(=O)C.C([O-])(=O)C.[Cu+2]>[C:15]1([N:12]2[CH:13]=[C:9]([B:4]3[O:5][C:6]([CH3:7])([CH3:8])[C:2]([CH3:14])([CH3:1])[O:3]3)[CH:10]=[N:11]2)[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1

Participants

7

Reactant 4

HCID 1049PyridineHCID 6228DimethylformamideHCID 66827Phenylboronic AcidHCID 27740104-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

Product 1

HCID 569657711-phenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazoleYield 111.1%

Reagents, catalysts & solvents 2

HCID 8895Cupric acetateCatalystHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
80 °C

Procedure

4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.07 g, 0.0003 mol) and phenylboronic acid (0.083 g, 0.00068 mol) were combined in DMF (1.50 mL, 0.0194 mol). Then copper(II) diacetate (0.010 g, 0.000055 mol) and pyridine (0.069 mL, 0.00085 mol) were added. The reaction was heated in an open tube to 80° C. for 40 minutes. The reaction was complete by HPLC, allowed to cool to rt, taken up in ethyl acetate, and washed with water saturated with sodium carbonate. The organic layer was washed with brine, dried over magnesium sulfate and concentrated to give 1-phenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.09 g) as an oily residue, LC/MS (M+H)+: 271.

Workup

  1. temperatureto cool to rt
  2. washwashed with water saturated with sodium carbonate
  3. washThe organic layer was washed with brine
  4. dry with materialdried over magnesium sulfate
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-04190f45d3454bbc95f28f3560e5e306
Source dataset
uspto-grants-2013_04
Patent number
US08415362B2

Reaction notes

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