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Intermediate 42 (100 mg, 0.33 mmol) was dissolved in dry THF (1 mL), ethyl trifluoroacetate (30 μl 0.39 mmol) was added and the reaction was refluxed for 18 hours. The reaction was cooled to RT, evaporated and the residue chromatographed from EtOAc to give compound 53 (49 mg, 37%) as a white solid: Mp 150-154° C. 1H NMR (500 MHz, DMSO-d6) δ 8.59 (s, 1H), 7.47 (d, J=9.0 Hz, 2H), 7.22 (d, J=8.6 Hz, 2H), 6.27 (d, J=7.6 Hz, 1H), 4.15 (d, J=13.1 Hz, 1H), 3.80 (d, J=11.1 Hz, 2H), 3.38 (t, J=11.9 Hz, 1H), 3.11 (t, J=12.1 Hz, 1H), 1.94 (t, J=15.2 Hz, 2H), 1.46-1.34 (m, 2H). Purity 100%. HRMS calculated for C15H15F6N3O3+H+ 400.1096. found (ESI(+), [M+H]) 400.1078.

1. temperaturethe reaction was refluxed for 18 hours
2. customevaporated
3. customthe residue chromatographed from EtOAc