Stereochemical determination of new cytochalasans from the plant endophytic fungus Trichoderma gamsii
作者:Lin Chen、Yue-Tao Liu、Bo Song、Hong-Wu Zhang、Gang Ding、Xing-Zhong Liu、Yu-Cheng Gu、Zhong-Mei Zou
DOI:10.1016/j.fitote.2014.04.009
日期:2014.7
Three new cytochalasans, trichalasins E (1), F (2) and H (7), together with four known analogues, trichalasin C (3), aspochalasin K (4), trichalasin G (5) and aspergillin PZ (8), were isolated from one endophytic fungus Trichoderma gamsii inhabiting in the traditional medicinal plant Panax notoginseng (BurK.) F.H. Chen. Trichalasins E (1) contains a unique hydroperoxyl group, which is the first report in all known analogues, whereas trichalasin H (7) possesses the rare 6/5/6/6/5 pentacyclic skeleton with 12-oxatricyclo [6.3.1.0(2,7)] moiety as that of aspergillin PZ (8). The relative configurations of the new compounds were characterized by analysis of coupling constants and ROESY correlations, and the absolute configurations of trichalasins E (1), H (7) and aspergillin PZ (8) were determined by modified Mosher's reaction. In addition, compounds 1-5,7 and 8 were tested cytotoxic activities against several cancer cell lines. (C) 2014 Elsevier B.V. All rights reserved.