2,6-Dimethoxybenzoyl chloride → Isoxaben

HRID 2166191Notes

Reaction equation

HRID 2166191 reaction equation
[NH2:1][C:2]1[O:6][N:5]=[C:4]([C:7]([CH2:11][CH3:12])([CH3:10])[CH2:8][CH3:9])[CH:3]=1.[CH3:13][O:14][C:15]1[CH:23]=[CH:22][CH:21]=[C:20]([O:24][CH3:25])[C:16]=1[C:17](Cl)=[O:18]>C1(C)C=CC=CC=1>[CH2:8]([C:7]([C:4]1[CH:3]=[C:2]([NH:1][C:17](=[O:18])[C:16]2[C:20]([O:24][CH3:25])=[CH:21][CH:22]=[CH:23][C:15]=2[O:14][CH3:13])[O:6][N:5]=1)([CH3:10])[CH2:11][CH3:12])[CH3:9]

Participants

4

Reactant 2

HCID 748102,6-Dimethoxybenzoyl chlorideHCID 924023-(1-Ethyl-1-methylpropyl)-5-isoxazolamine

Product 1

HCID 73672IsoxabenYield 91.6%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

To a stirred solution of 3.36 Kg of 5-amino-3-(1-ethyl-1-methylpropyl)isoxazole in 65 liters of toluene was added portion-wise over thirty minutes 4.015 Kg of 2,6-dimethoxybenzoyl chloride. The reaction mixture was heated to reflux and stirred for forty-eiht hours. It was then cooled to room temperature and concentrated to a volume of about 25 liters by evaporation of the solvent under reduced pressure. The product precipitated and was collected by filtration, washed with fresh toluene, and air dried to provide 6.084 Kg of N-[3-(1-ethyl-1-methylpropyl]-5-isoxazolyl]-2,6-dimethoxybenzamide. M.P. 172°-174° C. Yield 91%.

Workup

  1. temperatureThe reaction mixture was heated
  2. temperatureto reflux
  3. concentrationconcentrated to a volume of about 25 liters by evaporation of the solvent under reduced pressure
  4. customThe product precipitated
  5. filtrationwas collected by filtration
  6. washwashed with fresh toluene, and air
  7. customdried

Sources & evidence

ORD record
ord-64f22684605f418483b2fc3d53112b9f
Source dataset
uspto-grants-1990_07
Patent number
US04943634

Reaction notes

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