Scheme 2.
Synthesis of compounds 1–3h.
Reagents and conditions: i. (a) PhCOCH3, tBuNC, MeOH, TiCl4(cat.), MeOH, rt, 7 days; (b) Chromatographic separation; ii. BF3•2CH3COOH, 40–50 °C, 4–12 h; iii. NaOH, EtOH, rt, 10 min.
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