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Potassium Carbonate → 6-Chloro-5-(4-(2-hydroxypropan-2-yl)phenyl)-1H-indazole-3-carboxylic acid

HRID 1054809
Notes
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Reaction equation

HRID 1054809 reaction equation
Br[C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][C:10]=1[Cl:11])[NH:7][N:6]=[C:5]2[C:12]([OH:14])=[O:13].CC1(C)C(C)(C)OB([C:23]2[CH:28]=[CH:27][C:26]([C:29]([OH:32])([CH3:31])[CH3:30])=[CH:25][CH:24]=2)O1.C(=O)([O-])[O-].[K+].[K+]>C1(C)C=CC=CC=1.CCO.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[Cl:11][C:10]1[CH:9]=[C:8]2[C:4]([C:5]([C:12]([OH:14])=[O:13])=[N:6][NH:7]2)=[CH:3][C:2]=1[C:23]1[CH:28]=[CH:27][C:26]([C:29]([OH:32])([CH3:31])[CH3:30])=[CH:25][CH:24]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 3

HCID 11430Potassium CarbonateHCID 591660132-(4-(Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propan-2-olHCID 866987915-bromo-6-chloro-1H-indazole-3-carboxylic acid

Product 1

HCID 866988016-Chloro-5-(4-(2-hydroxypropan-2-yl)phenyl)-1H-indazole-3-carboxylic acidYield 35.3%

Reagents, catalysts & solvents 3

HCID 44119782
Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)
Catalyst
HCID 702EthanolSolvent
HCID 1140TolueneSolvent

Procedure

To a mixture of 5-bromo-6-chloro-1H-indazole-3-carboxylic acid (100 mg, 0.36 mmol) and 2-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-propan-2-ol (114 mg, 0.44 mmol) in toluene (1.5 mL) and EtOH (1.5 mL) was added 2 N aqueous potassium carbonate solution (0.7 mL, 1.4 mmol). The reaction mixture was degassed with N2 for 10 minutes, treated with [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (15.0 mg, 0.018 mmol), and heated to reflux for 16 hours. After cooling to room temperature, the reaction was quenched with 1 N NaOH (1 mL). The mixture was stirred for 30 minutes, acidified with 1 N HCl to pH 5 and extracted with EtOAc. The organic layer was washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude material was purified by reverse phase chromatography (Biotage C18 column, 0-40% MeCN/water) to give the title compound (42 mg, 35% yield) as a solid. MS (ES−) 329.1 (M−H)+. 1H NMR (400 MHz, CD3OD) δ 8.06 (s, 1H), 7.74 (s, 1H), 7.55 (d, J=8.20 Hz, 2H), 7.37 (d, J=8.20 Hz, 2H), 1.57 (s, 6H).

Workup

  1. customThe reaction mixture was degassed with N2 for 10 minutes
  2. temperatureheated
  3. temperatureto reflux for 16 hours
  4. customthe reaction was quenched with 1 N NaOH (1 mL)
  5. extractionextracted with EtOAc
  6. washThe organic layer was washed with brine
  7. dry with materialdried over Na2SO4
  8. concentrationconcentrated in vacuo
  9. customThe crude material was purified by reverse phase chromatography (Biotage C18 column, 0-40% MeCN/water)

Sources & evidence

ORD record
ord-9233d9f7ca3d46b4bd020c9358334453
Source dataset
uspto-grants-2016_07
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09394285B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes