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Chemical Synthesis of luteolin. a, b, c1, c2, d, and e represent the essential conditions for the completion of reaction: (a) BF3–Et2O, EtOAc, r.t., 2 h, 93%; (b) BCl3, CH2Cl2, 0 °C, r.t., 2 h, 87%; (c1) KOH, r.t., 72 h, 83%; (c2) BF3–Et2O, 100 °C, 6 h, 45%; (d) DMSO, I2, 130 °C, 4 h, 80%; (e) pyridine HCl, 180 °C, 6.5 h, 88%.
