122023-29-4Relevant articles and documents
Method for synthesizing 6-trifluoromethyl-3-methylindazole
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Paragraph 0026; 0029; 0031; 0034; 0036; 0039, (2021/10/16)
The invention relates to the field of synthesis of indazole compounds, and discloses a method for synthesizing 6-trifluoromethyl-3-methylindazole, which comprises the following steps: a, dissolving a raw material 2-fluoro-4-trifluoromethylbenzaldehyde in an organic solvent, cooling to -15 to -20 DEG C under the protection of argon, dropwise adding a methylmagnesium chloride solution, to prepare 1-(2-fluoro-4-trifluoromethyl phenyl) ethanol; b, dissolving 1-(2-fluoro-4-trifluoromethyl phenyl) ethanol in dichloromethane, adding PCC for a reaction at the room temperature, performing filtering and concentration, dissolving out a product through a mixed solution of ethyl acetate and petroleum ether, performing filtering and concentration, and obtaining 2-fluoro-4-trifluoromethyl acetophenone; and c, dissolving 2-fluoro-4-trifluoromethyl acetophenone in an organic solvent, adding hydrazine hydrate, reacting at 90-100 DEG C, concentrating the reaction solution, pulping with the organic solvent, carrying out suction filtration, and drying to obtain the product. The method solves the problem that an effective method for synthesizing the 6-trifluoromethyl-3-methylindazole is lacked in the prior art, and is short in synthesis route and simple and convenient to operate.