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Reagents and conditions: (a)434 Pd(OAc)2 (2 equiv), PCy3·HBF4 (4 equiv), K2CO3 (8 equiv), DMA, 130 °C, 32 h; (b) BAHA (1 equiv); (c) crystallization or cooling in solution; (d) heating in solution; (e) MeOH, DCM/toluene/Et2O (3:2:1) (for crystallization) or CDCl3 (for NMR).
