To a solution of Example 3 (0.05 g, 0.151 mmol) and triethylamine (0.053 mL, 0.377 mmol) in dichloromethane (1.0 mL) was added dropwise 2,2,2-trifluoroethanesulfonyl chloride (0.036 g, 0.196 mmol). The reaction mixture was stirred for 1 hour at room temperature and then purified by flash chromatography (silica gel, 0-5% methanol in dichloromethane) to afford 0.050 g (68%) of the title compound. 1H NMR (300 MHz, DMSO-d6) δ 3.49 (s, 3H) 4.55 (q, J=9.91 Hz, 2H) 6.28 (t, J=2.38 Hz, 1H) 6.86 (d, J=7.54 Hz, 2H) 6.95-7.07 (m, 2H) 7.20-7.31 (m, 5H) 7.40 (d, J=2.78 Hz, 1H) 10.43 (s, 1H) 12.02 (s, 1H). MS (APCI+) m/z 478 [M+H]+.
