Hydrochloric Acid → 1-[4-(4-Cyclohexyl-3-trifluoromethyl-benzylsulfanyl)-benzyl]-azetidine-3-carboxylic acid

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To a solution of 2-[4-(4-cyclohexyl-3-trifluoromethyl-benzylsulfanyl)-phenyl]-[1,3]dioxane (90 mg, 0.2 mmol) in THF (10 mL), is added aqueous HCl (2N, 0.7 mL). The solution is stirred at room temperature for 4 h. The solution is diluted with diethyl ether (30 mL), and washed with saturated aqueous NaHCO3 (3×10 mL). The organic layer is washed with saturated aqueous NaCl, dried over Na2SO4, and partially concentrated followed by dilution with MeOH (10 mL). To the resulting solution is added triethyl amine (0.5 mL) and azetidine-3-carboxylic acid (46 mmol, 0.4 mmol). The resulting mixture is stirred at 50° C. for 30 min. The reaction is cooled to room temperature and NaCNBH3 (63 mg, 1 mmol) is added. The resulting mixture is stirred for 30 min followed by concentration to dryness. The crude product is purified by preparative RP LC-MS to give 1-[4-(4-cyclohexyl-3-trifluoromethyl-benzylsulfanyl)-benzyl]-azetidine-3-carboxylic acid as a colorless oil. 1HNMR (400 MHz, CD3OD) δ7.55–7.54 (m, 2H), 7.52–7.35 (m, 5H), 4.39 (s, 2H), 4.35 (m, 4H), 4.17 (s, 2H), 3.68 (tt, 1H), 2.90 (tt, 1H), 1.87–1.75(m, 5H), 1.72–1.48 (m, 5H); MS (ES+): (464.2, M+1)+.

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