Bioactive Sulfur-Containing Sulochrin Dimers and Other Metabolites from an <i>Alternaria</i> sp. Isolate from a Hawaiian Soil Sample
作者:Shengxin Cai、Jarrod B. King、Lin Du、Douglas R. Powell、Robert H. Cichewicz
DOI:10.1021/np5005449
日期:2014.10.24
Polluxochrin (1) and dioschrin (2), two new dimers of sulochrin linked by thioether bonds, were purified from an Alternaria sp. isolate obtained from a Hawaiian soil sample. The structures of the two metabolites were established by NMR, mass spectrometry data, and X-ray analysis. Metabolite 1 was determined to be susceptible to intramolecular cyclization under aqueous conditions, resulting in the generation of 2 as well as another dimeric compound, castochrin (3). An additional nine new metabolites were also obtained, including four new pyrenochaetic acid derivatives (8-11), one new asterric acid analogue (13), and four new secalonic acid analogues (14-17). Bioassay analysis of these compounds revealed 1-3 displayed antimicrobial and weak cytotoxic activities.