[CH3:1][N:2]([CH3:6])[C:3](Cl)=[O:4].[Cl-].[Al+3].[Cl-].[Cl-].[NH2:11][C:12]1[CH:16]=[C:15]([C:17]([CH3:20])([CH3:19])[CH3:18])[O:14][N:13]=1>C1(C)C=CC=CC=1.O>[CH3:1][N:2]([CH3:6])[C:3]([NH:11][C:12]1[CH:16]=[C:15]([C:17]([CH3:20])([CH3:19])[CH3:18])[O:14][N:13]=1)=[O:4]N,N-Dimethylcarbamoyl chloride (7.91 g) and aluminum chloride (9.80 g) are added to toluene (100 ml), and the mixture is stirred at room temperature for 30 minutes. To this mixture is added 3-amino-5-t-butylisoxazole (9.81 g), and the resulting mixture is refluxed for 6 hours with stirring. After cooling, the reaction mixture is mixed with water, stirred at room temperature and shaken with toluene. The organic layer is evaporated to remove the toluene, whereby 1,1-dimethyl-3-(5-t-butyl-3-isoxazolyl)urea (14.63 g) is obtained. Yield is 98.9%. Melting point of the colorless crystalline product is 119 to 120.5° C. (after recrystallization from benzene).
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