(4-Methoxyphenyl)boronic acid → 3-(4-methoxyphenyl)-1H-indazole

HRID 2183089Notes

Reaction equation

HRID 2183089 reaction equation
Br[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[NH:4][N:3]=1.[CH3:11][O:12][C:13]1[CH:18]=[CH:17][C:16](B(O)O)=[CH:15][CH:14]=1>COCCOC.C(=O)([O-])[O-].[Na+].[Na+].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>[CH3:11][O:12][C:13]1[CH:18]=[CH:17][C:16]([C:2]2[C:10]3[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=3)[NH:4][N:3]=2)=[CH:15][CH:14]=1

Participants

6

Reactant 2

HCID 201262(4-Methoxyphenyl)boronic acidHCID 178419483HCID 178419483, compound

Product 1

HCID 98559703-(4-methoxyphenyl)-1H-indazoleYield 5.4%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 80711,2-DimethoxyethaneSolventHCID 10340Sodium CarbonateSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of 3-bromo-1H-indazole (0.20 g, 1.0 mmol), 4-methoxyphenylboronic acid (0.228 g, 1.5 mmol), and tetrakis(triphenylphosphine)palladium(0) (0.228 g, 0.1 mmol) in ethylene glycol dimethyl ether (5 mL) and 2.0 M sodium carbonate solution (6 mL) under nitrogen was heated at 100° C. for 18 hours. It was quenched by water and extracted with chloroform. The extracts were dried over magnesium sulfate, filtered, and concentrated. The residue was then purified by chromatography (SiO2, 15-30% ethyl acetate/hexane) to provide the title compound (0.012 g, 5% yield): 1H NMR (CDCl3) δ 10.4 (br s, 1H), 8.01 (d, 1H), 7.92 (d, 2H), 7.46 (m, 2H), 7.22 (m, 1H), 7.06 (d, 2H), 3.89 (s, 3H); EI-MS (m/z) 224 [M]+.

Workup

  1. customIt was quenched by water
  2. extractionextracted with chloroform
  3. dry with materialThe extracts were dried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue was then purified by chromatography (SiO2, 15-30% ethyl acetate/hexane)

Sources & evidence

ORD record
ord-0d6bc1511aef43649e12d1ecd7eb6b7d
Source dataset
uspto-grants-2005_05
Patent number
US06897231B2

Reaction notes

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