Structure determination of violaceol-I and -II, new fungal metabolites from a strain of Emericella violacea.
作者:MIKIO YAMAZAKI、YUKIO MAEBAYASHI
DOI:10.1248/cpb.30.514
日期:——
A toxic metabolite, violaceol, which was isolated from the fungus, E. violacea, was found to be a mixture of two isomers. Violaceol-I (3) and -II (4) were isolated as tetraacetates through acetylation and preparative thin layer chromatography. The structures of violaceol-I and -II were determined as shown in Fig. 1 and 2, mainly by the analysis of the 1H- and 13C-nuclear magnetic resonance spectral data, especially the 13C-1H indirect spin coupling constants. Violaceols were lethal to mice and exhibited weak antimicrobial activity.
从真菌 E. violacea 中分离出一种有毒代谢物--紫草醇,发现它是两种异构体的混合物。通过乙酰化和制备薄层色谱法,分离出了四乙酸酯形式的 violaceol-I (3) 和 -II (4)。主要通过分析 1H 和 13C 核磁共振光谱数据,特别是 13C-1H 间接自旋耦合常数,确定了紫草醇-I 和-II 的结构,如图 1 和图 2 所示。Violaceols 对小鼠有致死作用,并表现出微弱的抗菌活性。