Scheme 1.
Synthesis of flavones 1–4.
Reagents and conditions: a—pyridine, 110 °C, 2–3 h; b—KOH, pyridine, 60 °C, 4 h, 60%–80% (over 2 steps); c—AcOH, H2SO4, reflux, 16 h, 35%–55%.
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