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Medicinal chemists synthesized novel canthin-6-one alkaloids with promising antimicrobial activities. This research overcomes natural abundance limitations, providing new drug leads against fungal and bacterial pathogens.

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Pharmacology

Background:

  • Canthin-6-one alkaloids possess diverse bioactivities, including antitumor, antifungal, antibacterial, and antiviral properties.
  • Limited natural abundance hinders the full exploration of canthin-6-one alkaloid potential.
  • Efficient synthetic strategies are crucial for accessing these valuable compounds.

Purpose of the Study:

  • To develop a comprehensive synthetic route for canthin-6-one alkaloids and their derivatives.
  • To evaluate the antimicrobial activities of newly synthesized compounds against key human pathogens.
  • To report novel synthetic compounds and their biological properties.

Main Methods:

  • Utilized Suzuki coupling and Cu-catalyzed amidation reactions to construct the canthin-6-one core scaffold.
  • Employed Koenig-Knorr glycosylation for further modification of synthetic canthin-6-ones.
  • Assessed antimicrobial activity using the micro-dilution method against *C. albicans*, *C. neoformans*, *S. aureus*, and *E. coli*.

Main Results:

  • Successfully synthesized 17 compounds, including nine canthin-6-ones and 8 new derivatives.
  • Reported the first-time synthesis of alkaloids 4, 5, 7, and 12-13.
  • Alkaloids 1-4 and 9 demonstrated antimicrobial activity against *C. albicans*, *C. neoformans*, and *S. aureus* at 50 µg/mL.
  • Novel antimicrobial activity was observed for alkaloids 2, 4-5, and 12-13 against the tested pathogens.

Conclusions:

  • The study provides an effective synthetic strategy for canthin-6-one alkaloids, overcoming natural supply limitations.
  • The synthesized compounds show significant potential as antimicrobial agents.
  • This work lays the foundation for the development of novel pharmaceutical compounds derived from canthin-6-one alkaloids.