Diisopropylethylamine → 4-Methyl-2-{4'-trifluoromethyl-5-[1-(3-trifluoromethyl-benzenesulfonyl)-piperidin-3-yl]-biphenyl-3-yl}-pentanoic acid ethyl ester

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To a solution of compound 33b, 4-Methyl-2-(5-piperidin-3-yl-4′-trifluoromethyl-biphenyl-3-yl)-pentanoic acid ethyl ester (42 mg, 0.094mmol) in anhydrous CH2Cl2 (5 ml) was added 3-(Trifluoromethyl)benzene sulfonyl chloride (22.5 μl, 0.14 mmol) and diisopropylethylamine (32.7 μl, 0.19 mmol). The reaction stirred at room temperature overnight, was diluted with EtOAc and washed with sat. NaHCO3, and brine, dried and filtered. Purification by silica gel chromatography (Isco) gave the desired product, (48.5 mg, 79%). Calcd for C33H35F6NO4S (M+H) 655.69, Found 656.2.

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