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Reagents and conditions: (a) CsCO3, DMF, rt, 16 h, 92%; (b) DBU, DMF, rt to 60–65 °C, 1.5–4 h, 76 → 95%; (c) TFV, DCC, Et3N, DMAP, DMF or NMP, 100 or 105 °C, 18–24 h, 30–69%.
