Two new indole alkaloids, 6-(4-methoxyphenoxy)-4-methoxy-2-methyl-1H-indole (1) and 6-(3,5-dimethoxyphenoxy)-4-methoxy-2-methyl-1H-indole (2), along with four known ones (3–6), were isolated from the fermentation products of the cigar tobacco-derived endophytic fungus Aspergillus oryzae. Their structures were elucidated by spectroscopic methods, including extensive 1D and 2D NMR techniques. Compounds 1 and 2 were evaluated for their antibacterial and antioxidant activities. The results showed that compounds 1 and 2 exhibited good anti-methicillin-resistant Staphylococcus aureus (anti-MRSA) activity with IZD of 22.4 ± 2.4 and 24.6 ± 2.2 mm, respectively.
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Acknowledgment
This project was supported financially by the Foundation of Chemical and Biological Innovation Studio of Yunnan Industrial Co., Ltd., the Foundation of Yunnan Tobacco Industry Co., Ltd. (No. 2020JC02), the National Natural Science Foundation of China (No. 21967021), and the Foundation of Yunnan Innovative Research Team (2019HC020).
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Published in Khimiya Prirodnykh Soedinenii, No. 6, November–December, 2022, pp. 920–923.
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Li, Mf., Xiao, D., Zhu, LC. et al. Indole Alkaloids from the Cigar Tobacco-Derived Endophytic Fungus Aspergillus oryzae and Their Antibacterial Activity. Chem Nat Compd 58, 1093–1097 (2022). https://doi.org/10.1007/s10600-022-03872-x
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DOI: https://doi.org/10.1007/s10600-022-03872-x