| 摘要 |
PURPOSE: An industrial method for preparing [5-{(2,6-difluorobenzyloxy)methyl}-4,5-dihydro-5-methyl-3-(3-methylthiophene-2-yl)-isoxazole](methiozolin) is provided to obtain a large amount of the methiozolin of high purity and to cultivate agricultural crops. CONSTITUTION: A method for preparing thiozolin(chemical formula 1) comprises: a step of reacting 4,5-dihydro-5-methyl-3-{(3-methylthiophene-2-yl)-isoxazole-5-yl}methanol of chemical formula 2 with 2,6-difluorobenzyl(chloride or bromide) of chemical formula 3 using an alkali metal base and a phase converting catalyst in a mixture of water and organic solvent at 50-100 Deg. C. to prepare the concentrate of an organic layer; and a step of crystallizing the concentrate in a mixture solvent of water/ethanol, water/isopropanol, or C1-C3 alcohol/n-heptane. The organic solvent is benzene, toluene, xylene, chlorobenzene, or 1,2-dichloroethane. The alkali metal base is sodium hydroxide, potassium hydroxide, or lithium hydroxide. |
