To a stirred solution of the material from Step 9 (225 mg, 0.27 mmol) in dichloroethane (1.3 mL) at 0° C. was added trifluoroacetic acid (500 μL, 6.49 mmol). The reaction mixture was stirred at 0° C. for 1 hour, poured into saturated aqueous NaHCO3, and extracted with dichloromethane (2×). The combined organics were dried over MgSO4, filtered and concentrated in vacuo. The residue was purified by flash chromatography on silica gel using EtOAc-hexanes to afford 160 mg of the title compound. LCMS (M+1)=593.
