Water → 1-Isopropylaminocarbonyl-4-chloro-3-(3,5-dichlorophenyl)pyrazole

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Reaction Steps

0.95 g (0.011 mol) of isopropyl isocyanate are added, dropwise and at 0° C., to a solution of 2.55 g (0.01 mol) of 4-chloro-3-(3,5-dichlorophenyl)-1H-pyrazole and 1.55 ml (0.011 mol) of triethylamine in 20 ml of anhydrous DMF. Stirring is continued for 2 h at room temperature. The reaction mixture is poured into 100 ml of water and extracted with ethyl acetate. After drying the organic phase and concentration under vacuum, the residue is triturated with 50 ml of heptane, filtered and dried. We obtain 2.10 g of 1-isopropylaminocarbonyl-4-chloro-3-(3,5-dichlorophenyl)pyrazole, melting at 127° C.

Provenance & Evidence