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Synthesis of series 4 compounds. Reagents and conditions: a) N‐iodosuccinimide, AcOH, 100 °C, 28 h, 47.4–46.9 %; b) mCPBA, CHCl3, 3 h, RT, 90.6–92.7 %; c) POCl3, CHCl3, 3 h, reflux, 72.9–85.7 %; d) 4‐(dimethylamino)methylphenylboronic acid, Pd(PPh3)4, Na2CO3, toluene/H2O, 14 h, 76.3–91.5 %; e) benzyl alcohol/phenol/thiophenol, NaH, THF, RT, 6 h, 68.0–99.3 %.
