Trifluoromethanesulfonic acid → n-[2-(5-Chloro-3-pyridyl)-3-(4-chloro-3-iodophenyl)-1-methylpropyl]-2-(5-trifluoromethyl-2-pyridyloxy)-2-methylpropanamide

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The procedure of Barluenga (J Org Chem 1990, 55, 3104) was used. Thus, to a solution of N-[3-(4-chlorophenyl)-2-(5-chloro-3-pyridyl)-1-methylpropyl]-2-(5-trifluoromethyl-2-pyridyloxy)-2-methylpropanamide (Example 398, 22 mg, 0.041 mmol) and bis(pyridine)iodonium tetrafluoroborate (30 mg, 0.082 mmol) in 0.3 mL anhydrous CH2Cl2 was added triflic acid (18 μL, 0.20 mmol). After stirring at room temperature for 50 min, the reaction mixture was poured into a mixture of ice (20 g) and sodium bisulfite (1 g) and was extracted with EtOAc. The organic extracts were dried over anhydrous sodium sulfate, filtered and concentrated to dryness to give the crude product, which was purified by preparative HPLC eluting on a reverse-phase HPLC column with 75 to 100% water in acetonitrile (containing 0.1% trifluoroacetic acid) to give the title compound. 1H NMR (500 MHz, CD3OD): δ 8.43 (d, 1H), 8.32 (s, 1H), 8.10 (s, 1H), 8.04 (d, 1H), 7.99 (dd, 1H), 7.82 (m, 1H), 7.36 d, 1H), 7.22 (d, 1H), 7.08 (d, 1H), 6.78 (dd, 1H), 4.29 (m, 1H), 3.03 (dd, 1H), 2.94 (m, 1H), 2.64 (dd, 1H), 1.78 (s, 3H), 1.75 (s, 3H), 0.88 (d, 3H). LC-MS: m/e 652 (M+H)+ (4.1 min).

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