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Spiromeroterpenoids from the Higher Plants.

Yohei Saito1, Tomoya Nishida1, Kyoko Nakagawa-Goto1,2,3

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Spiromeroterpenoids, natural products with a unique spiro-ring structure, are found in plants. These compounds feature a terpenoid linked to a non-terpenoid part, often a polyketide or flavanone.

Keywords:
AnnonaceaeAsteraceaeHypericaceaeLauraceaeMyrtaceaespiromeroterpenoid

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Area of Science:

  • Natural Product Chemistry
  • Organic Chemistry
  • Phytochemistry

Background:

  • Meroterpenoids are diverse natural products biosynthesized by various organisms.
  • Spiromeroterpenoids, a subclass, uniquely feature a spiro-ring connecting terpenoid and non-terpenoid components.
  • Plant families like Myrtaceae are known sources of spiromeroterpenoids.

Purpose of the Study:

  • To elucidate the structural diversity and biosynthesis of plant-derived spiromeroterpenoids.
  • To highlight the unique non-terpenoid moieties found in these compounds.
  • To understand the cyclization mechanisms forming the spiro-ring.

Main Methods:

  • Literature review of known spiromeroterpenoids and their sources.
  • Analysis of reported chemical structures and biosynthetic pathways.
  • Examination of cyclization strategies, including [m+n] and radical/ionic pathways.

Main Results:

  • Plant spiromeroterpenoids typically consist of monoterpene or sesquiterpene units.
  • The non-terpenoid part is commonly a polyketide (e.g., phloroglucinol derivatives) or, rarely, a flavanone.
  • Examples include syncarpic acid, tasmanone, and syzygioblanes.

Conclusions:

  • Spiromeroterpenoids represent a unique structural class of natural products in plants.
  • Their biosynthesis involves specific cyclization reactions to form the characteristic spiro-ring.
  • Further research can uncover novel spiromeroterpenoids and their biological activities.