Hyperbeanols F-Q, diverse monoterpenoid polyprenylated acylphloroglucinols from the flowers of Hypericum beanii

Phytochemistry. 2019 Mar:159:56-64. doi: 10.1016/j.phytochem.2018.12.005. Epub 2018 Dec 20.

Abstract

Hyperbeanols F-Q, which are twelve undescribed monoterpenoid polyprenylated acylphloroglucinols, and four known analogues were isolated from the dried flowers of Hypericum beanii. Their structures were elucidated by detailed HRESIMS and 1D and 2D NMR data analyses. The absolute configurations of hyperbeanols FH were established by the circular dichroism (CD) exciton chirality method. The plausible biosynthetic pathway speculation of hyperbeanols F-Q indicated that diverse reactions, including prenylation, 1,6-ene reaction, rearrangement, epoxidation and dehydration, contributed to their diverse skeletons. Hyperbeanols FI, O and hypercalin B exhibited moderate nitric oxide (NO) inhibitory activities in LPS-induced RAW 264.7 macrophages, with IC50 values in the range of 17.11-28.74 μM.

Keywords: Anti-inflammatory activity; CD exciton chirality; Hypericaceae; Hypericum beanii N. Robson; Monoterpenoid polyprenylated acylphloroglucinols.

MeSH terms

  • Animals
  • Anti-Inflammatory Agents / chemistry
  • Anti-Inflammatory Agents / isolation & purification
  • Anti-Inflammatory Agents / pharmacology*
  • Flowers / chemistry*
  • Hypericum / chemistry*
  • Lipopolysaccharides / pharmacology
  • Mice
  • Molecular Structure
  • Monoterpenes / chemistry*
  • Monoterpenes / isolation & purification
  • Monoterpenes / pharmacology
  • Nitric Oxide / antagonists & inhibitors
  • Nitric Oxide / biosynthesis
  • Phloroglucinol / analogs & derivatives*
  • Phloroglucinol / chemistry
  • Phloroglucinol / isolation & purification*
  • Prenylation
  • RAW 264.7 Cells
  • Spectrum Analysis / methods
  • Stereoisomerism

Substances

  • Anti-Inflammatory Agents
  • Lipopolysaccharides
  • Monoterpenes
  • Nitric Oxide
  • Phloroglucinol