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Trifluoroacetic acid (2.0 mL) was added dropwise to 78 (210 mg, 0.514 mmol) dissolved in CH2Cl2 (2 mL) at 0° C. The reaction mixture was stirred at RT for 3 h and the volatiles were removed under reduced pressure. The residue was recrystallized (EtOAc:hexanes) to afford 98.0 mg (54%) of 79 as a yellow solid. 1H NMR (400 MHz, DMSO-d6): δ 1.52 (br s, 6H), 1.98 (br s, 2H), 2.19 (br s, 2H), 6.52 (d, J=16.0 Hz, 1H), 6.66 (d, J=8.4 Hz, 2H), 6.87 (d, J=8.4 Hz, 2H), 7.11 (t, J=7.9 Hz, 1H), 7.42 (d, J=7.9 Hz, 1H), 7.52 (m, 2H), 9.33 (s, 1H), 12.40 (br s, 1H). LRMS (ESI): m/z 353 (M+H)+.

1. customthe volatiles were removed under reduced pressure
2. customThe residue was recrystallized (EtOAc:hexanes)