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Efficient solid-phase synthesis and structural characterization of segetalins A-H, J and K
Liangyu Liu1, Wanqiu Lu1, Quanping Guo1
1Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, 199 West Donggang Road, Lanzhou 730000, China.
Beilstein Journal of Organic Chemistry
|December 3, 2025
Summary
Scientists developed a new solid-phase synthesis for segetalins, which are bioactive cyclopeptides from Vaccaria segetalis. This efficient method allows for scalable production and biological evaluation of these important compounds.
Area of Science:
- Organic Chemistry
- Medicinal Chemistry
- Peptide Chemistry
Background:
- Segetalins A-H, J, and K are bioactive cyclopeptides isolated from Vaccaria segetalis.
- Previous synthetic methods for these compounds have limitations.
Purpose of the Study:
- To establish an efficient and scalable solid-phase synthesis strategy for segetalins A-H, J, and K.
- To enable biological evaluation of these cyclopeptides.
Main Methods:
- Solid-phase peptide synthesis (SPPS) using Fmoc chemistry on 2-chlorotrityl chloride resin.
- Head-to-tail cyclization mediated by PyBOP in DMF.
- Purification by reversed-phase high-performance liquid chromatography (RP-HPLC).
Main Results:
- Total synthesis of segetalins A-H, J, and K (1-10) was achieved.
- Isolated yields ranged from 45-70% for all cyclopeptides.
- Structural identities were confirmed by HRESIMS, NMR, and HPLC (>95% purity).
- Circular dichroism (CD) spectroscopy revealed distinct secondary structures, including beta-sheets and alpha-helical elements.
Conclusions:
- An efficient and scalable solid-phase strategy for segetalin synthesis was established.
- This methodology overcomes limitations of previous synthetic approaches.
- The synthesized segetalins are available for further biological evaluation.
Keywords:
Fmoc-solid-phase peptide synthesis (Fmoc-SPPS)Vaccaria segetalishead-to-tail cyclizationplant cyclopeptidesMore Related Videos
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