2,6-Dichlorobenzaldchloroxime → 2,2-dichloro-N-[4-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl]acetamide

HRID 1352227Notes

Reaction equation

HRID 1352227 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([Cl:8])[C:3]=1[C:9](Cl)=[N:10][OH:11].[Cl:13][CH:14]([Cl:26])[C:15]([NH:17][C:18]1[CH:23]=[CH:22][C:21]([C:24]#[CH:25])=[CH:20][CH:19]=1)=[O:16]>C1COCC1.C(N(CC)CC)C>[Cl:13][CH:14]([Cl:26])[C:15]([NH:17][C:18]1[CH:23]=[CH:22][C:21]([C:24]2[O:11][N:10]=[C:9]([C:3]3[C:2]([Cl:1])=[CH:7][CH:6]=[CH:5][C:4]=3[Cl:8])[CH:25]=2)=[CH:20][CH:19]=1)=[O:16]

Participants

5

Reactant 2

HCID 28001642,6-DichlorobenzaldchloroximeHCID 211003382,2-Dichloro-N-(4-ethynylphenyl)Acetamide2×

Product 1

HCID 103418252,2-dichloro-N-[4-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl]acetamide

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8471TriethylamineSolvent

Procedure

2,6-Dichloro-N-hydroxybenzenecarboximidoyl chloride (1.01 g, 4.5 mmol) and 2,2-dichloro-N-(4-ethynylphenyl)acetamide (1.01 g, 4.42 mmol) were dissolved in anhydrous THF (40 mL) and triethylamine (1.0 mL). The mixture was stirred at room temperature for 1 h then heated at reflux for 4 h to generate the 2,6-dichlorophenyl nitrile oxide intermediate, which reacted by a 1,3-dipolar cycloaddition reaction with 2,2-dichloro-N-(4-ethynylphenyl)acetamide. The solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate and washed successively with water and brine. The ethyl acetate solution was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting solid was purified by column chromatography on silica gel, eluting with 8:2 hexanes-ethyl acetate. The appropriate fractions were combined to give 2,2-dichloro-N-[4-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl]acetamide as a tan solid.

Workup

  1. temperaturethen heated
  2. temperatureat reflux for 4 h
  3. customThe solvent was removed under reduced pressure
  4. dissolutionThe residue was dissolved in ethyl acetate
  5. washwashed successively with water and brine
  6. dry with materialThe ethyl acetate solution was dried over anhydrous sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure
  9. customThe resulting solid was purified by column chromatography on silica gel
  10. washeluting with 8:2 hexanes-ethyl acetate

Sources & evidence

ORD record
ord-34d11512bd554aa5b36312773eff7fa2
Source dataset
uspto-grants-2007_05
Patent number
US07220745B2

Reaction notes

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