Benzene, 1-bromo-4-(trifluoromethyl)- → 4-Methyl-2-{4'-trifluoromethyl-5-[1-(4-trifluoromethyl-phenyl)-piperidin-4-yl]-biphenyl-3-yl}-pentanoic acid ethyl ester

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Reaction Steps

To a solution of a mixture of 4-methyl-2-(5-piperidin-4-yl-4′-trifluoromethyl-biphenyl-3-yl)-pentanoic acid ethyl ester and methyl ester (68b) (75 mg, 0.17 mmol) in toluene (1.0 mL) was added Pd2(dba)3 (1.6 mg, 0.0017 mmol), racemic-2-(di-t-butylphosphino)-1,1′-binaphthyl (0.7 mg, 0.0017 mmol), 1-bromo-4-trifluoromethyl-benzene (38 mg, 0.17 mmol) and sodium tert-butoxide (22 mg, 0.23 mmol). The mixture was heated, in a sealed-tube, to reflux for 3.5 h. The reaction was quenched with H2O at room temperature and extracted with EtOAc (3×10 mL). The organic was washed with brine (2×10 mL), dried (MgSO4) and concentrated in vacuo. The crude mixture was purified by ISCO column chromatography to obtain 4-methyl-2-{4′-trifluoromethyl-5-[1-(4-trifluoromethyl-phenyl)-piperidin-4-yl]-biphenyl-3-yl}-pentanoic acid ethyl ester and methyl ester. Calcd for C32H33F6NO2 (M+H) 578.60, Found 578.4 (methyl ester) and Calcd for C33H35F6NO2 (M+H) 592.63, Found 592.31 (ethyl ester).

Provenance & Evidence