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Reagents and conditions: (a) 16, DIPEA, NMP, 180 °C, 1 h; (b) 3,5-dimethylpyrazole, Xantphos, cesium carbonate. Pd2(dba)3, DMF/toluene, 140 °C, 1 h; (c) DIPEA, THF, 100 °C, 16 h; (d) 16, Xantphos, Pd2(dba)3, cesium carbonate, DMF/toluene, 80 °C, 1 h.
