2 results about "Isopropenyl acetate" patented technology

The present invention belongs to the technical field of organic synthesis, and particularly relates to a method for preparing 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone-methoxy oxime ether. The method comprises the following steps: (1) chlorination reaction: adding a chlorinating agent into aniline as a raw material in a solvent at 0-10°C, and performing a chlorination reaction to obtain 2,4,6-trichloroaniline; (2) coupling reaction: subjecting 2,4,6-trichloroaniline, isopropenyl acetate and a catalyst to a coupling reaction in a solvent under the initiation of nitroxyl ions, so as to obtain 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone; (3) oximation reaction: subjecting 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone and hydroxylamine hydrochloride to an oximation reaction in a solvent under the action of an alkali, so as to obtain 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone-oxime; and (4) methylation reaction: subjecting 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone-oxime and chloromethane to a methylation reaction in a solvent under the action of an alkali, so as to obtain 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone-methoxy oxime ether.

The invention discloses a synthesis method of a meconazole intermediate 4-(4-chlorophenoxy)-1-(1-methyl vinyl)-2-(trifluoromethyl) benzene, which comprises the following steps of: performing defluorination etherification reaction on 2-bromine-5-fluorobenzotrifluoride (I) serving as a raw material and 4-chlorophenol (II) in the presence of an alkaline reagent to obtain 1-bromine-4-(4-chlorophenoxy)-2-(trifluoromethyl) benzene (III), and reacting the 1-bromine-4-(4-chlorophenoxy)-2-(trifluoromethyl) benzene (III) with 4-chlorophenol (II) to obtain the meconazole intermediate 4-(4-chlorophenoxy)-1-(1-methylvinyl)-2-(trifluoromethyl) benzene (III). The preparation method comprises the following steps: reacting a compound (III) with a Grignard exchange reagent (IV) to prepare an aryl Grignard reagent, and reacting with isopropenyl acetate (V) under the action of an iron catalyst to obtain a meconazole intermediate 4-(4-chlorophenoxy)-1-(1-methylvinyl)-2-(trifluoromethyl) benzene (VI); the method has the advantages of simple reaction system, cheap and easily available raw materials, high raw material conversion rate and high product selectivity, is suitable for industrial production, and has a good application prospect; .