Cesium fluoride → Ethyl 2-(5-chloro-6-(2,2,2-trifluoroethoxy)-4'-(trifluoromethyl)biphenyl-3-yl)-4-methylpentanoate

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Reaction Conditions

Reaction Steps

A mixture of ethyl 2-(3-bromo-5-chloro-4-(2,2,2-trifluoroethoxy)phenyl)-4-methylpentanoate (1 g, 1 eq), 4-Trifluoromethyl phenylboronic acid (2.6 g, 1.4 eq), Pd(PPh3)4 (1.3 g, 0.1 eq) and Cesium Fluoride (13.1 g, 2 eq) in DME (30 ml) was stirred for overnight at 100° C. Upon completion, the precipitate was removed by filtration. The filtrate was diluted with water and extracted with ethyl acetate (2×50 mL). The combined organic layers were washed with water followed by brine, dried over Na2SO4 and concentrated under vacuo. The residue was purified by Flash Column Chromatography to give ethyl 2-(5-chloro-6-(2,2,2-trifluoroethoxy)-4′-(trifluoromethyl)biphenyl-3-yl)-4-methylpentanoate in 74% yield (1.08 g). 1HNMR (CDCl3, 400 MHz): 7.68 (m, 5H), 7.43 (s, 1H); 7.24 (s, 1H); 4.4 (q, 2H), 4.13 (q, 2H); 3.55 (t, 1H); 1.93 (m, 1H), 1.58 (m, 1H); 1.45 (m, 1H); 1.24 (t, 3H), 0.92 (d, 6H);

Provenance & Evidence