(3-(Trifluoromethyl)phenyl)hydrazine → 3-Methoxymethyl-5-methyl-1-(3-trifluoromethyl-phenyl)-1h-pyrazole-4-carboxylic acid ethyl ester

Beteiligte Stoffe

Reaktionsschritte

In analogy to the procedure described in Example 38A], 3-(trifluoromethyl)phenylhydrazine and rac-2-acetyl-4-methoxy-3-oxo-butyric acid ethyl ester gave after purification by flash column chromatography (CH2Cl2 to 5% Et2O/CH2Cl2) 5-methoxymethyl-3-methyl-1-(3-trifluoromethyl-phenyl)-1H-pyrazole-4-carboxylic acid ethyl ester and in 25% yield as light brown solid. MS: 343.0 (MH+) and 3-methoxymethyl-5-methyl-1-(3-trifluoromethyl-phenyl)-1H-pyrazole-4-carboxylic acid ethyl ester and in 36% yield as orange oil. MS: 343.0 (MH+).

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