Scheme 1.
Synthesis of target compounds 6a–p; Reagents and conditions: (i) CH3CN, DMF, NaH, benzene, reflux 4 h; (ii) Ethanol, phenylhydrazine, reflux 1 h; (iii) HOAc/H2O (1:1 v/v), heating at 120 °C, 8–11 h.
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