Cytotoxic Germacrane-Type Sesquiterpene Lactones from the Whole Plant of Carpesium lipskyi

J Nat Prod. 2019 Apr 26;82(4):919-927. doi: 10.1021/acs.jnatprod.8b01004. Epub 2019 Mar 14.

Abstract

Ten new sesquiterpene lactones, carlipsines A-J (1-10), and 12 known analogues (11-22) were isolated from the whole plant of Carpesium lipskyi. Their structures were elucidated by using 1D and 2D NMR and HRESIMS analyses, and their absolute configurations were confirmed by X-ray diffraction studies. All compounds were identified as germacranolides with diverse substructural features. Compounds 1-4 are 2,5-hemiacetal-linked germacranolides. Compounds 5 and 6 possess a 1,2-epoxy moiety. Compounds 7 and 8 represent unusual 1,5-hemiacetal-linked germacranolides. Compounds 9 and 10 contain a tetrahydrofuran unit with the oxygen atom bridging C-1 and C-8. Compounds 6, 7, 8, 19, 20, 21, and 22 showed cytotoxicity against HL-60 and A-549 cell lines with IC50 values ranging from 2.8 to 10.3 μM.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antineoplastic Agents, Phytogenic / chemistry
  • Antineoplastic Agents, Phytogenic / isolation & purification
  • Antineoplastic Agents, Phytogenic / pharmacology*
  • Asteraceae / chemistry*
  • Drug Screening Assays, Antitumor
  • Molecular Structure
  • Sesquiterpenes, Germacrane / chemistry
  • Sesquiterpenes, Germacrane / isolation & purification
  • Sesquiterpenes, Germacrane / pharmacology*
  • Spectrum Analysis / methods

Substances

  • Antineoplastic Agents, Phytogenic
  • Sesquiterpenes, Germacrane