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Synthesis of target compounds 8 a–f and comparison compound 8 g. Reagents and conditions: i) FeCl3, 60 °C, 16 h; ii) 48 % HBr, AcOH, reflux, 3.5 h; iii) H2, Pd/C, MeOH, 10 bar, RT, 16 h; iv) oxone, CH2Cl2/H2O, RT, 3.5 h; v) AcOH, RT, 16 h, vi) nitrosobenzene, AcOH, RT, 16 h.
