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Oxidation studies on Andrographolide.

Vijayavitthal T Mathad1, Satish Kumar, Kanwal Raj

  • 1Medicinal & Process Chemistry Division, Central Drug Research Institute, Lucknow-226001, India. kanwalraj12@rediffmail.com

Natural Product Research
|November 28, 2006
PubMed
Summary
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Jones oxidation of Andrographolide (1) yielded three dehydro-derivatives. Subsequent tritylation at C19-OH produced intermediates convertible to acetate and oxidation products, expanding Andrographolide

Area of Science:

  • Organic Chemistry
  • Natural Product Synthesis
  • Medicinal Chemistry

Background:

  • Andrographolide is a bioactive diterpenoid lactone isolated from Andrographis paniculata.
  • Exploring chemical modifications of Andrographolide is crucial for discovering new derivatives with potentially enhanced therapeutic properties.

Purpose of the Study:

  • To investigate the chemical reactivity of Andrographolide under specific oxidation and protection conditions.
  • To synthesize novel Andrographolide derivatives through selective functionalization.

Main Methods:

  • Jones oxidation was employed to introduce unsaturation into the Andrographolide structure.
  • Selective tritylation at the C19-hydroxyl group was performed to protect and facilitate further transformations.

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Main Results:

  • Jones oxidation of Andrographolide (1) afforded a mixture of 3-dehydroandrographolide (5), 3,19-bisdehydroandrographolide (6), and 19-dehydroandrographolide (7).
  • Tritylation of Andrographolide at C19-OH yielded products 8 and diene 9.
  • Diene 9 was successfully converted to its acetate derivative 10 and oxidation product 11.

Conclusions:

  • Selective oxidation and protection strategies can be effectively applied to Andrographolide.
  • The synthesized derivatives represent potential new leads for further pharmacological evaluation.