Sodium Carbonate → 7-(2,4-dichloro-phenyl)-1H-indazole

HRID 902535Notes

Reaction equation

HRID 902535 reaction equation
Br[C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:10]=1[NH:9][N:8]=[CH:7]2.[Cl:11][C:12]1[CH:17]=[C:16]([Cl:18])[CH:15]=[CH:14][C:13]=1B(O)O.C([O-])([O-])=O.[Na+].[Na+]>COCCOC.[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[Cl:11][C:12]1[CH:17]=[C:16]([Cl:18])[CH:15]=[CH:14][C:13]=1[C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:10]=1[NH:9][N:8]=[CH:7]2

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 2734659(2,4-Dichlorophenyl)boronic acidHCID 203238997-Bromo-1H-indazole

Product 1

HCID 686153577-(2,4-dichloro-phenyl)-1H-indazole

Reagents, catalysts & solvents 2

HCID 11979704Tetrakis(triphenylphosphine)palladiumCatalystHCID 80711,2-DimethoxyethaneSolvent

Conditions

Temperature
80 °C

Procedure

A solution of 7-bromo-1H-indazole (3; 1.01 g, 5.13 mmol) and tetrakis(triphenylphosphine) palladium(0) (0.176 g, 0.152 mmol) in 15 mL of ethylene glycol dimethyl ether was stirred for 30 m. To the solution was added 2,4-dichlorophenyl boronic acid (1.93 g, 10.1 mmol) and a 2 M aqueous Na2CO3 solution (7.1 mL, 14.2 mmol). The orange-yellow mixture was stirred at 80° C. for 19 h, allowed to cool, then partitioned between 50 mL of ethyl acetate and 50 mL of water. The organic layer was dried over MgSO4, filtered, and concentrated to an orange oil. Column chromatography (0→10% EtOAc/hexanes) afforded of 7-(2,4-dichloro-phenyl)-1H-indazole as a pale yellow foamy solid (4; 1.12 g, 83%).

Workup

  1. temperatureto cool
  2. custompartitioned between 50 mL of ethyl acetate and 50 mL of water
  3. dry with materialThe organic layer was dried over MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated to an orange oil

Sources & evidence

ORD record
ord-6b1a905697f242cbbbd1874879763a8c
Source dataset
uspto-grants-2008_04
Patent number
US07365211B2

Reaction notes

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