Sodium Carbonate → HCID 67074008, compound

HRID 2359113Notes

Reaction equation

HRID 2359113 reaction equation
Br[C:2]1[CH:3]=[N:4][N:5]([CH:7]2[CH2:12][CH2:11][CH2:10][CH2:9][O:8]2)[CH:6]=1.C(=O)([O-])[O-].[Na+].[Na+].[N:19]1[CH:24]=[CH:23][C:22](B(O)O)=[CH:21][CH:20]=1>O1CCOCC1.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[O:8]1[CH2:9][CH2:10][CH2:11][CH2:12][CH:7]1[N:5]1[CH:6]=[C:2]([C:22]2[CH:23]=[CH:24][N:19]=[CH:20][CH:21]=2)[CH:3]=[N:4]1

Participants

7

Reactant 3

HCID 10340Sodium CarbonateHCID 2734379(Pyridin-4-yl)boronic acidHCID 467394664-bromo-1-(oxan-2-yl)-1H-pyrazole

Product 1

HCID 67074008HCID 67074008, compoundYield 68%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
80 °C

Procedure

A mixture of tetrakis(triphenylphosphine)palladium(0) (0.025 eq, 4.22 mmol), 4-bromo-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazole (1 eq, 0.17 mol, synthesis described in US2009/203705), sodium carbonate (675 mL, 2.0 M solution in water, 1.35 mol) and 4-pyridine boronic acid (1.2 eq, 0.21 mol) in dioxane (2000 mL) was heated under argon 41 h at 80° C. After that time, the reaction mixture was diluted with water (50 mL) and the volatiles were reduced in vacuo to a quarter of the volume. The crude was extracted with ethyl acetate and the combined organic fractions were washed with brine, dried over MgSO4 and evaporated. The obtained crude material was purified by bulb-to-bulb distillation (bp 130-135° C. at 0.02 mm Hg) and 26.37 g (68%) 4-[1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazol-4-yl]pyridine were obtained as slightly yellow viscuous oil.

Workup

  1. custom1 eq, 0.17 mol, synthesis
  2. extractionThe crude was extracted with ethyl acetate
  3. washthe combined organic fractions were washed with brine
  4. dry with materialdried over MgSO4
  5. customevaporated
  6. customThe obtained crude material
  7. distillationwas purified by bulb-to-bulb distillation (bp 130-135° C. at 0.02 mm Hg)

Sources & evidence

ORD record
ord-76a7a4379bac44e2976433475b239f79
Source dataset
uspto-grants-2014_04
Patent number
US08685974B2

Reaction notes

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