Isolation, Structure Elucidation, and Synthesis of Eudistomides A and B, Lipopeptides from a Fijian Ascidian <i>Eudistoma</i> sp.
作者:Emily L. Whitson、Anokha S. Ratnayake、Tim S. Bugni、Mary Kay Harper、Chris M. Ireland
DOI:10.1021/jo8022582
日期:2009.2.6
Eudistomides A (1) and B (2), two new cyclic peptides, were isolated from a Fijian ascidian Eudistoma sp. These five-residue cystine-linked cyclic peptides are flanked by a C-terminal methyl ester and a 12-oxo- or 12-hydroxy-tetradecanoyl moiety. The complete structures of the eudistomides were determined using a combination of spectroscopic and chemical methods. Chiral HPLC analysis revealed that
Eudistomides A ( 1 ) 和 B ( 2 ),两个新的环肽,是从斐济海鞘Eudistoma sp.中分离出来的。这些五残基胱氨酸连接的环肽的两侧是 C 端甲酯和 12-氧代-或 12-羟基-十四烷酰基部分。使用光谱和化学方法的组合确定eudistomides的完整结构。手性HPLC分析显示1和2中的所有五个氨基酸残基都具有l-构型。eudistomides A ( 1 ) 和 B ( 2 ) 的全合成) 确认了提议的结构。C-35差向异构体乙酰氧基的混合物的对映选择性脂肪酶催化水解所指示的35 - [R绝对构型2。