Scheme 3.
Synthesis of compounds A7, A13, A15, A17, A20, B1–B17. Reagents and conditions: (a) I2, EtOH, reflux, 3–5 h, 40%–80%; (b) BBr3/DCM, DCM, −10 °C to rt, 24–36 h, 40%–63%.
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