The invention discloses a synthesis method of high-selectivity 1-methyl-3-(
trifluoromethyl)-1H-
pyrazole-5-
alcohol, the synthesis method comprises the following steps: taking ethyl 4, 4, 4-trifluoroacetoacetate and a
methylhydrazine aqueous solution as raw materials, carrying out condensation cyclization reaction in the presence of an
organic solvent and a catalyst, after the reaction is finished, filtering the
reaction system, washing and
drying, and obtaining the target product 1-methyl-3-(
trifluoromethyl)-1H-
pyrazole-5-
alcohol. According to the invention, cheap raw materials and solvents are adopted, and the
reagent ethanol can be generated in the reaction, so that the reaction can be carried out in the forward direction, the reaction efficiency is improved, the
reaction conditions are mild, and the reaction process is easy to control; by adding the limited catalyst, the selectivity and the yield of the reaction can be further improved, the yield reaches up to 95% or above, the selectivity of the target product to the byproduct is greater than 99: 1, and the method not only ensures high-selectivity preparation of the target product, but also is relatively high in overall yield, relatively low in cost, less in environmental
pollution and suitable for industrial production.