Sodium borohydride → HCID 10294562, compound

Participants

Reaction Steps

To a suspension of 4-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-5-ethoxymethyleneamino-3-trifluoromethylpyrazole (1.0 g) in methanol (10 ml) stirred at room temperature was added sodium borohydride (0.17 g). After 2 hours an additional 0.17 g of sodium borohydride was added, and another 0.34 g added after 1 hours. One hour later the mixture was poured onto water (80 ml). The combined extracts were dried over anhydrous magnesium sulphate, filtered, and evaporated in vacuo. The white solid thus obtained was purified by chromatography on silica (Merck, 230-400 mesh, 0.7 kg cm-2) with dichloromethane as eluent, to furnish 4-cyano-5-methylamino-1-(2,6-dichloro-4-trifluoromethylphenyl)-3-trifluoromethylpyrazole as a white solid (0.6 g), m.p. 200°-202° C.

Provenance & Evidence