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Armochaetoglobins A–J: Cytochalasan Alkaloids from Chaetomium globosum TW1-1, a Fungus Derived from the Terrestrial Arthropod Armadillidium vulgare

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journal contribution
posted on 26.06.2015, 00:00 by Chunmei Chen, Jianping Wang, Junjun Liu, Hucheng Zhu, Bin Sun, Jing Wang, Jinwen Zhang, Zengwei Luo, Guangmin Yao, Yongbo Xue, Yonghui Zhang
Ten new cytochalasan alkaloids, termed armochaetoglobins A–J (110), and four known chaetoglobosins (1114) were isolated from a methanol extract of Chaetomium globosum TW1-1, a fungus isolated from the medicinal terrestrial arthropod Armadillidium vulgare. Their structures were elucidated by a combination of spectroscopy, single-crystal X-ray crystallography, and ECD calculations. Armochaetoglobins A–E (15) represented the first examples of seco-chaetoglobosins arising from an oxidative cleavage of C-19 and C-20. Among these compounds, armochaetoglobin A (1) features an unusual pyrrole ring. The cytotoxic activities of 210 were evaluated, and armochaetoglobin H (8) showed moderate inhibitory activities against five human cancer cell lines, with IC50 values ranging from 3.31 to 9.83 μM.