Organic Letters· 2026Q1
Structural and Chemical Characterization of Kopsiyunnanines O1, O2, and P: Monoterpenoid Bisindole Alkaloids from Yunnan Kopsia arborea
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- 2026year
Short summary
Two new monoterpenoid bisindole alkaloids, kopsiyunnanines O1 and P, were isolated from Kopsia arborea and structurally characterized.
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Key points
- Two new monoterpenoid bisindole alkaloids, kopsiyunnanines O1 and P, were isolated from Kopsia arborea.
- These alkaloids are composed of eburnamine- and rhazidigenine-related monomeric units.
- Kopsiyunnanine O2 was identified as an interconvertible isomer of kopsiyunnanine O1.
- The interconversion between O1 and O2 is reversible and affected by solvent and acid.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Two previously undescribed monoterpenoid bisindole alkaloids, kopsiyunnanines O1 and P, were isolated from Kopsia arborea (Apocynaceae) and structurally characterized. These two bisindoles are composed of eburnamine- and rhazidigenine-related monomeric units and differ in substituents attached to C-7′ of the rhazidigenine-related unit. Furthermore, kopsiyunnanine O2 was identified as an interconvertible isomer of kopsiyunnanine O1. The reversible interconversion between kopsiyunnanines O1 and O2 was influenced by the solvent and the addition of acid.
The authors' abstract, as published at the source. Organic Letters, 2026 · DOI ↗
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Field: Pharmacology (Pharmacology, Toxicology and Pharmaceutics)
PharmacologyPharmacology, Toxicology and Pharmaceutics