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Synthetic investigation demonstrates convergent total syntheses of quebrachamine and kopsiyunnanine D, highlighting efficient construction of complex azonane frameworks.
The total syntheses of (±)-quebrachamine and (±)-kopsiyunnanine D are reported. Key transformations include an intermolecular Horner–Wadsworth–Emmons olefination to merge the two fragments convergently and an intramolecular Mitsunobu reaction to introduce the synthetically challenging nine-membered azonane ring efficiently.
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Liu et al. (2024) studied this question.
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