New Quinazolinone Alkaloids within Rare Amino Acid Residue from Coral-Associated Fungus, Aspergillus versicolor LCJ-5-4
journal contributionposted on 04.03.2011, 00:00 by Yibin Zhuang, Xiancun Teng, Yi Wang, Peipei Liu, Guoqiang Li, Weiming Zhu
Cottoquinazoline D (3), a new alkaloid with a 1-aminocyclopropane-1-carboxylic acid residue rarely discovered in nature, was isolated and identified together with two new quinazolinone alkaloids, cottoquinazolines B (1) and C (2), from coral-associated fungus Aspergillus versicolor LCJ-5-4. Their structures including absolute configurations were elucidated based on spectroscopic methods, X-ray single crystal diffraction analysis, and chemical methods. A possible biogenetic pathway for them was proposed.