Tricyclohexylphosphine → {5-[4-(Ethoxycarbonyl)-5-(trifluoromethyl)-1H-pyrazol-1-yl]-3-fluoro-2-methoxyphenyl}boronic acid

Participants

Reaction Steps

Ethyl 1-(3-fluoro-5-iodo-4-methoxyphenyl)-5-(trifluoromethyl)-1h-pyrazole-4-carboxylate (340 mg, 0.742 mmol), bis(hexyleneglycolato)diboron (283 mg, 1.113 mmol), tricyclohexylphosphine (62.4 mg, 0.223 mmol), potassium acetate (182 mg, 1.855 mmol), 1,1′-bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (121 mg, 0.148 mmol) and 1,4-dioxane (10 mL) were sealed in a microwave vessel and subject to microwave irradiation at 140° C. for a total of 2 hrs (1+1). The crude mixture was combined with the reaction crude from an identical probe reaction (32 mg scale). Volatiles were removed under reduced pressure. The resulting crude mixture was purified by flash chromatography (SiO2, Biotage SNAP Cartridge, silica gel, KP-Sil, 100 g cartridge). The column was eluted by an EtOAc/hexanes mixture (0% to 40%). Related fractions were pooled and evaporated to afford a brown oil as a mixture of the titled compound and the de-iodinated reduced by-product (step B). LCMS calc.=376.09. found=377.18 (M+H)+.

Provenance & Evidence