Isolation and Characterization of Diastereomers of Discorhabdins H and K and Assignment of Absolute Configuration to Discorhabdins D, N, Q, S, T, and U
作者:Tanja Grkovic、A. Norrie Pearce、Murray H. G. Munro、John W. Blunt、Michael T. Davies-Coleman、Brent R. Copp
DOI:10.1021/np100443c
日期:2010.10.22
Investigations of four different sponge populations of Latrunculia species collected in New Zealand waters has led to the characterization of a new diastereomer of discorhabdin H, named discorhabdin H2, confirmation of the structure of discorhabdin K ((+)-7), and presentation of a new diastereomer, discorhabdin K2 ((−)-8). In each case the structures were established by extensive NMR and MS studies
对在新西兰水域中收集到的四种不同的Latrunculia物种的海绵种群的调查已导致了一种新的Discorhabdin H非对映异构体的表征,命名为discorhabdin H 2,确认了Discorhabdin K((+)- 7)的结构,并提出了一个新的非对映异构体,discorhabdin K 2((-)- 8)。在每种情况下,都通过广泛的NMR和MS研究确定了结构,并通过电子圆二色性(ECD)询问了绝对构型。通过将ECD谱图与记录的具有绝对绝对构型的discorhabdin生物碱的记录进行比较,将绝对构型分配给已知的代谢产物discorhabdins H,D,2-羟基-D,N和Q,而Discorhabdins S,T和U的构型通过(+)-(6 S,8 S)-discorhabdin B的半合成分配。