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Iridoids from Crescentia alata.

María Guadalupe Valladares1, María Yolanda Rios

  • 1Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Chamilpa 62209, Cuernavaca, Morelos, México.

Journal of Natural Products
|January 27, 2007
PubMed
Summary

Four novel 11-nor-iridoids were isolated from Crescentia alata fruit pulp. These findings align with previous chemical studies of related Crescentia species, expanding knowledge of their phytochemistry.

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Area of Science:

  • Natural Product Chemistry
  • Phytochemistry
  • Organic Chemistry

Background:

  • The genus Crescentia is known for its unique chemical constituents, particularly iridoids.
  • Limited phytochemical investigations have been conducted on Crescentia species, highlighting a gap in knowledge.

Purpose of the Study:

  • To isolate and characterize new 11-nor-iridoid compounds from the fruit pulp of Crescentia alata.
  • To contribute to the understanding of the chemical diversity within the Crescentia genus.

Main Methods:

  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation employing spectroscopic methods (IR, UV, NMR - 1H, 13C, DEPT, COSY, HSQC, HMBC) and Mass Spectrometry (MS).
  • Confirmation of structures through X-ray crystallographic analysis.

Main Results:

  • Four new 11-nor-iridoids, compounds 1-4, were successfully isolated and identified.
  • Compound 1: 6beta,7beta,8alpha,10-tetrahydroxy-cis-2-oxabicyclo[4.3.0]nonan-3-one.
  • Compound 2: 6beta,7beta,8alpha,10-tetra-p-hydroxybenzoyl-cis-2-oxabicyclo[4.3.0]nonan-3-one.
  • Compound 3: 1beta,6beta,7alpha,8alpha,10-pentahydroxy-cis-2-oxabicyclo[4.3.0]nonane.
  • Compound 4: 6beta-hydroxy-2-oxabicyclo[4.3.0]Delta8-9-nonen-1-one.

Conclusions:

  • The isolation of compounds 1-4 from Crescentia alata is consistent with the known iridoid profiles of related species.
  • This study expands the phytochemical database of Crescentia alata, particularly concerning 11-nor-iridoids.
  • The comprehensive structural analysis provides valuable data for further research into the biosynthesis and potential bioactivity of these compounds.

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