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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Isoprenylated cyclohexanoids from the basidiomycete Hexagonia speciosa
Meng-Yuan Jiang1, Yan Li, Fei Wang
1State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
Researchers isolated nine new cyclohexanoids and a furanone from Hexagonia speciosa. Speciosin B demonstrated significant cytotoxicity against multiple tumor cell lines, indicating potential anticancer properties.
Area of Science:
- Natural Product Chemistry
- Mycology
- Pharmacology
Background:
- The basidiomycete fungus Hexagonia speciosa is a source of bioactive natural products.
- Previous studies have identified various compounds from this organism.
Purpose of the Study:
- To isolate and characterize new metabolites from Hexagonia speciosa.
- To evaluate the cytotoxic activity of isolated compounds against tumor cell lines.
Main Methods:
- Scale-up cultures of Hexagonia speciosa.
- Structure elucidation using 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
- Cytotoxicity assays against various human tumor cell lines.
Main Results:
- Nine new oxygenated cyclohexanoids (speciosins L-T) and a 5H-furan-2-one metabolite (5'-O-acetylaporpinone A) were isolated.
- Known analogs including speciosins A, B, D, E, F, I, K, and aporpinone A were also identified.
- Speciosin B exhibited significant cytotoxicity against several tumor cell lines with half-maximal inhibitory concentration (IC50) values ranging from 0.23 to 3.30 μM.
Conclusions:
- Hexagonia speciosa produces a diverse array of oxygenated cyclohexanoids and furanone derivatives.
- Speciosin B is a potent cytotoxic agent with potential for anticancer drug development.
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