Scheme 2.
Synthetic route of target compounds 14a-f and 15a-f. Reagents and conditions: (a) DMF, 100 °C, 2 h; (b) Conc. HCl, H2O, 50 °C, 2 h; (c) 8a or 8b, EtOH, 80 °C, 2 h.
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