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1-(4,6-dimethylpyrimidin-2-yl)-5-(4-methylphenyl)-3-trifluoromethylpyrazole[ No CAS ]
5-hydroxy-3-(4-methylphenyl)-1-(4,6-dimethylpyrimidin-2-yl)-5-trifluoromethyl-Δ2-pyrazoline[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
37%; 45%
In ethanol; for 7h;Reflux;
General procedure: An equimolar mixture of 2-hydrazino-4,6-dimethylpyrimidine 1(0.27 g, 2 mmol) and aryltrifluoromethyl-b-diketones 2d-h (2 mmol) was refluxed in ethanol (25 mL) for 7 h. The reaction wasmonitored by tlc. On completion of the reaction, solvent was evaporated in vacuo. The tlc and 1H NMR of the reaction mixture showed the formation of two products in the ratio given in Table 1. Column chromatography separation using silica gel (100-200 mesh) with petroleum ether : ethyl acetate (99:1) as an eluent afforded 3 and further elution of column with petroleum ether :ethyl acetate (99:2) furnished the second product 4.