Cesium carbonate → 6-(4-hydroxy-phenyl)-1-(tetrahydro-pyran-2-yl)-3-vinyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid

HRID 82039

Reaction equation

HRID 82039 reaction equation
C([O:3][C:4]([C:6]1[C:7]2[C:15]([CH:16]=[CH2:17])=[N:14][N:13]([CH:18]3[CH2:23][CH2:22][CH2:21][CH2:20][O:19]3)[C:8]=2[N:9]=[C:10](Cl)[CH:11]=1)=[O:5])C.[OH:24][C:25]1[CH:30]=[CH:29][C:28](B(O)O)=[CH:27][CH:26]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.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>[OH:24][C:25]1[CH:30]=[CH:29][C:28]([C:10]2[CH:11]=[C:6]([C:4]([OH:3])=[O:5])[C:7]3[C:15]([CH:16]=[CH2:17])=[N:14][N:13]([CH:18]4[CH2:23][CH2:22][CH2:21][CH2:20][O:19]4)[C:8]=3[N:9]=2)=[CH:27][CH:26]=1

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 27343604-Hydroxyphenylboronic acidHCID 866781686-chloro-1-(tetrahydro-pyran-2-yl)-3-vinyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid ethyl ester

Product 1

HCID 1363595036-(4-hydroxy-phenyl)-1-(tetrahydro-pyran-2-yl)-3-vinyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acidYield 143.7%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 312751,4-DioxaneSolvent

Procedure

To a solution of 6-chloro-1-(tetrahydro-pyran-2-yl)-3-vinyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid ethyl ester (2.00 g, 5.96 mmol), described in example 16.1, in dioxane (54 mL) were added 4-hydroxyphenylboronic acid (0.90 g, 6.55 mmol) and an aqueous solution of cesium carbonate (0.4 M, 27 mL, 10.8 mmol). The resulting solution was degassed using argon, tetrakis(triphenylphosphine)palladium (0.62 g, 0.54 mmol) was then added and the reaction mixture was refluxed overnight. Dioxane was removed under vacuum, water was added and then the mixture was acidified to pH=2. The aqueous phase was extracted with a mixture of tetrahydrofuran and EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered, concentrated under vacuum to give the title compound (3.13 g) as a brown foam which was used without further purification.

Workup

  1. customThe resulting solution was degassed
  2. additionwas then added
  3. temperaturethe reaction mixture was refluxed overnight
  4. customDioxane was removed under vacuum, water
  5. additionwas added
  6. extractionThe aqueous phase was extracted with a mixture of tetrahydrofuran and EtOAc
  7. washThe combined organic extracts were washed with brine
  8. dry with materialdried (Na2SO4)
  9. filtrationfiltered
  10. concentrationconcentrated under vacuum

Sources & evidence

ORD record
ord-8d689576def44b3cae178a21b4357d6c
Source dataset
uspto-grants-2014_09
Patent number
US08846712B2

Linked notes

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