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

HRID 82035
Notes
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Reaction equation

HRID 82035 reaction equation
C([O:3][C:4]([C:6]1[C:7]2[C:15](/[CH:16]=[CH:17]/[C:18]3[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=3)=[N:14][N:13]([CH:24]3[CH2:29][CH2:28][CH2:27][CH2:26][O:25]3)[C:8]=2[N:9]=[C:10](Cl)[CH:11]=1)=[O:5])C.[OH:30][C:31]1[CH:36]=[CH:35][C:34](B(O)O)=[CH:33][CH:32]=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:30][C:31]1[CH:36]=[CH:35][C:34]([C:10]2[CH:11]=[C:6]([C:4]([OH:3])=[O:5])[C:7]3[C:15](/[CH:16]=[CH:17]/[C:18]4[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=4)=[N:14][N:13]([CH:24]4[CH2:29][CH2:28][CH2:27][CH2:26][O:25]4)[C:8]=3[N:9]=2)=[CH:33][CH:32]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 27343604-Hydroxyphenylboronic acidHCID 866781696-chloro-3-((E)-styryl)-1-(tetrahydro-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid ethyl ester

Product 1

HCID 1363594996-(4-hydroxy-phenyl)-3-((E)-styryl)-1-(tetrahydro-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acidYield 79%

Reagents, catalysts & solvents 2

HCID 178418397
HCID 178418397, compound
Catalyst
HCID 312751,4-DioxaneSolvent

Procedure

To a solution of 6-chloro-3-((E)-styryl)-1-(tetrahydro-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid ethyl ester (2.8 g, 6.80 mmol) in dioxane (60 ml) were added 4-hydroxyphenylboronic acid (1.03 g, 7.48 mmol) and an aqueous solution of cesium carbonate (0.4M, 30 mL). The resulting solution was degassed using argon, tetrakis(triphenylphosphine)palladium (0.71 g, 0.61 mmol) was then added and the reaction mixture was refluxed overnight. Dioxane was removed under vacuum, methylene chloride and water were added, and the mixture was acidified until pH=2. The organic layer was washed with water and the aqueous phase was extracted using methylene chloride. The resulting organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give the title compound (2.37 g, 79%) as a yellow solid which was used without any 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, methylene chloride and water
  5. additionwere added
  6. washThe organic layer was washed with water
  7. extractionthe aqueous phase was extracted
  8. dry with materialdried over anhydrous sodium sulfate
  9. filtrationfiltered
  10. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-f981aef52ac943de9e3a06645bd07ce1
Source dataset
uspto-grants-2014_09
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08846712B2

Reaction notes

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