Potassium Carbonate → Tert-butyl(trans)-2-(3'-(trifluoromethyl)biphenyl-4-yl)cyclopropylcarbamate

Beteiligte Stoffe

Reaktionsschritte

To a solution of tert-butyl (trans)-2-(4-bromophenyl)cyclopropylcarbamate (Intermediate E[a2]) (1 g, 3.2 mmol), potassium carbonate (1.31 g, 9.6 mmol), 3-(trifluoromethyl) phenylboronic acid (0.73 g, 3.8 mmol) in acetonitrile:water (4:1) were degassed for 30 mins, added tetrakis triphenylphosphine palladium (36 mg, 0.032 mmol), degassed again for 10 mins, heated the reaction mixture at reflux temperature for 5 h. After completion, the reaction mixture was poured in ice water (50 mL), extracted with, ethyl acetate (2×50 mL). Combined extracts were washed with water (70 mL), brine (70 mL), dried over anhydrous Na2SO4, filtered and evaporated. The crude residue was purified by column chromatography (SiO2), by using EtOAc:Petroleum ether (2:8) to get tert-butyl (trans)-2-(3′-(trifluoromethyl)biphenyl-4-yl)cyclopropylcarbamate (0.8 g, 66%) as a white solid.

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