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Synthesis of compounds 6.
Reagents and conditions: i. (a) CH3COCH2CH2COOH, tBuNC, MeOH, MeOH, rt, 24 h; (b) Chromatographic separation; ii. BF3•2CH3COOH, 40–50 °C, 4–12 h; iii. NaOH, EtOH, rt, 10 min. The selected NOESY correlations have been shown for (4S,8aR)-6 and (4R,8aR)-6.
