(4-Bromophenyl)boronic acid → 4-(4-Bromo-phenyl)-3,5-dimethyl-isoxazole

HRID 1453011Notes

Reaction equation

HRID 1453011 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5](B(O)O)=[CH:4][CH:3]=1.[CH3:11][C:12]1[C:16](I)=[C:15]([CH3:18])[O:14][N:13]=1.C([O-])(O)=O.[Na+]>COCCOC.O.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:16]2[C:12]([CH3:11])=[N:13][O:14][C:15]=2[CH3:18])=[CH:4][CH:3]=1

Participants

7

Reactant 3

HCID 79599(4-Bromophenyl)boronic acidHCID 516892Sodium BicarbonateHCID 6138834-Iodo-3,5-dimethyl-1,2-oxazole

Product 1

HCID 103324224-(4-Bromo-phenyl)-3,5-dimethyl-isoxazoleYield 86%

Reagents, catalysts & solvents 3

HCID 178418476HCID 178418476, compoundCatalystHCID 962WaterSolventHCID 80711,2-DimethoxyethaneSolvent

Conditions

Temperature
80 °C

Procedure

A mixture of 4-bromophenylboronic acid (1 g, 5 mmol), 3,5-dimethyl-4-iodoisoxazole (0.93 g, 4.2 mmol), bis(triphenylphospine)palladium(II) chloride (59 mg, 2 mol %), NaHCO3 (1.06 g, 12.6 mmol) in DME (5 mL) and H2O (5 mL) was heated to 80° C. under N2 for 18 h. The reaction mixture was partitioned between 1N HCl and EtOAc. The organic layer was washed with saturated NaHCO3, brine, dried over Na2SO4 and concentrated. The residue was purified by silica gel chromatography (5% EtOAc in hexanes) to give the title compound as a white solid (0.9 g, 86%). 1H NMR (CDCl3): δ 2.26 (s, 3H), 2.40 (s, 3H), 7.13 (d, 2H, J=8.3 Hz), 7.58 (d, 2H, J=8.3 Hz).

Workup

  1. customThe reaction mixture was partitioned between 1N HCl and EtOAc
  2. washThe organic layer was washed with saturated NaHCO3, brine
  3. dry with materialdried over Na2SO4
  4. concentrationconcentrated
  5. customThe residue was purified by silica gel chromatography (5% EtOAc in hexanes)

Sources & evidence

ORD record
ord-80509eb069e5400b8afa58aef4a2e9f2
Source dataset
uspto-grants-2009_01
Patent number
US07473790B2

Reaction notes

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