Title
Reisolation and Configurational Reinvestigation of Cottoquinazolines E–G from an Arthropod-Derived Strain of the Fungus Neosartorya fischeri
Author
Shuang Lin, Huimin Yu, Beiye Yang, Fengli Li, Xia Chen, Huaqiang Li, Sitian Zhang, Jianping Wang, Youcai Hu, Zhengxi Hu, Yonghui Zhang
Year
2020
Journal
Journal of Natural Products
Abstract
The reported fumiquinazoline-related alkaloids cottoquinazolines E–G (1–3) were reisolated from solid cultures of the fungus Neosartorya fischeri, which was isolated from the medicinal arthropod Cryptotympana atrata. The unresolved issues regarding the absolute configurations (for cottoquinazolines E and F) prompted a reinvestigation of the configurations for all three compounds, as enabled by extensive spectroscopic methods, comparisons of experimental electronic circular dichroism data, and X-ray crystallography. In addition, cottoquinazoline F (2) showed significant antibacterial activity against ESBL-producing Escherichia coli, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterococcus faecalis with MIC values of 8, 32, 32, and 16 μg/mL, respectively.
Instrument
J-810
Keywords
Circular dichroism, Absolute configuration, Natural products, Medicinal