Sodium Bicarbonate → Methyl 1-isopropyl-6-(1H-pyrazol-4-yl)-1H-indazole-4-carboxylate

HRID 1476410

Reaction equation

HRID 1476410 reaction equation
Br[C:2]1[CH:3]=[C:4]([C:14]([O:16][CH3:17])=[O:15])[C:5]2[CH:6]=[N:7][N:8]([CH:11]([CH3:13])[CH3:12])[C:9]=2[CH:10]=1.CC1(C)C(C)(C)OB([C:26]2[CH:27]=[N:28][NH:29][CH:30]=2)O1.C([O-])(O)=O.[Na+]>O1CCOCC1.O.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].C(Cl)Cl>[CH:11]([N:8]1[C:9]2[CH:10]=[C:2]([C:26]3[CH:27]=[N:28][NH:29][CH:30]=3)[CH:3]=[C:4]([C:14]([O:16][CH3:17])=[O:15])[C:5]=2[CH:6]=[N:7]1)([CH3:13])[CH3:12]

Participants

7

Reactant 3

HCID 516892Sodium BicarbonateHCID 27740104-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazoleHCID 67464993Methyl 6-bromo-1-isopropyl-1H-indazole-4-carboxylate

Product 1

HCID 67467921Methyl 1-isopropyl-6-(1H-pyrazol-4-yl)-1H-indazole-4-carboxylate

Reagents, catalysts & solvents 3

HCID 178418807HCID 178418807, compoundCatalystHCID 962WaterSolvent2×HCID 312751,4-DioxaneSolvent

Procedure

To a stirred solution of methyl 6-bromo-1-isopropyl-1H-indazole-4-carboxylate, 1 (0.8 g, 2.7 mmol) in 1,4-dioxane (20 mL) were added 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.576 g, 2.97 mmol) and NaHCO3 (0.567 g, 6.75 mmol) dissolved in water (8 mL). The reaction mixture was degassed with argon gas for 30 min. To the resulting mixture was added PdCl2(dppf)-CH2Cl2 adduct (0.110 g, 0.135 mmol) and the mixture heated at reflux for 3 h. The reaction mixture was diluted with water (30 mL) and extracted with ethyl acetate (100 mL). The organic layer was dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure to afford 800 mg of crude product. The crude compound was purified by silica gel chromatography (eluent: 5% MeOH/DCM) to the title compound as a pale liquid (375 mg, 47%). LCMS (ES−) m/z=283.11.

Workup

  1. customThe reaction mixture was degassed with argon gas for 30 min
  2. temperaturethe mixture heated
  3. temperatureat reflux for 3 h
  4. extractionextracted with ethyl acetate (100 mL)
  5. dry with materialThe organic layer was dried over anhydrous Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-59d4437b9537419db01ea2e1b794eb59
Source dataset
uspto-grants-2015_04
Patent number
US09018382B2

Linked notes

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