New compounds from a hydrothermal vent crab-associated fungus Aspergillus versicolor XZ-4
作者:Chengqian Pan、Yutong Shi、Xuegang Chen、Chen-Tung Arthur Chen、Xinyi Tao、Bin Wu
DOI:10.1039/c6ob02374f
日期:——
1 and 4 were determined by chiral phase HPLC analysis of their hydrolysis products. The absolute configurations of 2, 3 and 7 were defined mainly by comparison of the quantum chemical TDDFT calculated and the experimental ECD spectra, and the absolute configuration of 5 was deduced from comparison of the optical rotation values reported in the literature. The presence of two atropisomers of 5 was established
从台湾葵山套热液泄放蟹相关真菌曲霉曲霉的EtOAc提取物中分离出三种新的喹唑啉衍生物(1-3),一种新的含氧杂环丁烷的天然产物(4)和四种新的环penin衍生物(5-7和9)。杂色XZ-4。通过HRMS,1D和2D NMR光谱数据分析确定了它们的平面结构。化合物1和4的绝对构型是通过手性HPLC分析其水解产物来确定的。的绝对构型2,3和7通过比较所计算的量子化学TDDFT和实验ECD光谱来定义它们,并且通过比较文献中报道的旋光度值来推导5的绝对构型。通过NOE分析确定存在两种5的阻转异构体。化合物1–3中的Ile和Val单元允许分配新的喹唑啉骨架,这是首次在喹唑啉骨架中定义异亮氨酸的构型。这项研究中首次报道了一系列的7-甲氧基环peninin衍生物。化合物的bioevaluation 5,7,8和9在MIC值约为32μgmL -1时发现抑制大肠杆菌的活性。