Scheme 1.
Synthesis of Target compounds 6a–f and 8a–c. Reagents and conditions: (i) NaNO2/HCl/0–5 °C; (ii) CH3COONa/EtOH/0–5 °C; (iii) EtOH/Catalytic amount of glacial acetic acid/reflux 6 h.
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