Diisopropylethylamine → 4-Methyl-2-{4'-trifluoromethyl-5-[1-(2-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 (30.5 mg, 0.07mmol) in anhydrous CH2Cl2 (4 ml) was added 2-(Trifluoromethyl)benzene sulfonyl chloride (25.0 mg, 0.10 mmol) and diisopropylethylamine (24 μl, 0.14 mmol). The reaction stirred at room temperature 3 hours, was diluted with EtOAc and washed with sat. NaHCO3, and brine, dried and filtered. Purification by silica gel chromatography (Isco) gave the desired product, (35.4 mg, 79% ). Calcd for C33H35F6NO4S (M+H) 655.69, Found 656.2.

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