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Flavonoids from Cleistocalyx operculatus.

Chun-Lin Ye1, Yan-Hua Lu, Dong-Zhi Wei

  • 1State Key Laboratory of Bioreactor Engineering, Institute of Biochemistry, East China University of Science and Technology, Shanghai 200237, China.

Phytochemistry
|February 5, 2004
PubMed
Summary
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Two new flavonoids were identified in Cleistocalyx operculatus buds. Spectroscopic analysis confirmed the structures of these compounds and five known ones.

Area of Science:

  • Phytochemistry
  • Natural Product Chemistry

Background:

  • Cleistocalyx operculatus is a plant species known for its potential medicinal properties.
  • The chemical constituents of this plant are not fully elucidated, necessitating further investigation.

Purpose of the Study:

  • To isolate and characterize novel and known chemical compounds from the dried buds of Cleistocalyx operculatus.
  • To determine the structures of the isolated compounds using advanced spectroscopic techniques.

Main Methods:

  • Dried buds of Cleistocalyx operculatus were subjected to extraction and isolation procedures.
  • Spectroscopic analyses including UV, IR, EIMS, 1H NMR, 13C NMR, and HMBC were employed for structural elucidation.

Main Results:

  • Two new flavonoids, 3'-formyl-4',6'-dihydroxy-2'-methoxy-5'-methylchalcone and (2S)-8-formyl-5-hydroxy-7-methoxy-6-methylflavanone, were isolated.

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  • Five known compounds were also identified from the plant extract.
  • The structures of all isolated compounds were successfully determined.

    • Conclusions:

    • The phytochemical investigation of Cleistocalyx operculatus buds yielded two novel flavonoid compounds.
    • The study expands the knowledge of the chemical diversity of Cleistocalyx operculatus and provides a basis for further pharmacological studies.