Trifluoroacetic acid → 4-Butoxy-benzenesulfonic acid 4-(3-[1-(4-butoxy-benzenesulfonyl)-azetidin-3-ylamino]-2-hydroxy-propoxy}-phenyl Ester

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To a solution of 4-butoxy-benzenesulfonic acid 4-(3-{[1-(4-butoxybenzene-sulfonyl)azetidin-3-yl]-tert-butoxycarbonyl-amino}-2-hydroxy-propoxy)-phenylester (0.12 g, 0.15 mmol) in dichloromethane (2 ml) was added trifluoroacetic acid (0.12 ml, 1.5 mmol). The mixture was stirred at room temperature for 4 h, and then quenched with saturated sodium carbonate solution and extracted with dichloromethane. The organic solution was washed with brine, dried over sodium sufate, and evaporated to give 0.10 g of a white solid; MS (ES) m/z 663.1 (MH+); HRMS (ES) Calcd. for C32H43N2O9S2 (MH+): 663.2410, Found: 663.2401.

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