Tolylboronic acid → HCID 9866300, compound

Participants

Reaction Steps

To a rapidly stirred solution of 5-amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-iodopyrazole (0.45 g) in toluene (2 ml) containing tetrakis(triphenylphosphine)palladium(0) (0.02 g) was added saturated aqueous sodium hydrogen carbonate solution (1 ml) and a solution of 4-methylphenylboronic acid (0.3 g) in ethanol (1 ml). The mixture was heated under reflux for 2 hours. After cooling the organic layer was separated, dried (MgSO4) and evaporated. The residue was taken up the minimum amount of ethyl acetate and purified by column chromatography on silica gel (50 g) eluted with dichloromethane. Combination and evaporation of suitable fractions followed by trituration with hexane gave the title compound as an off-white crystalline solid, m.p.243-4° C.

Provenance & Evidence