The first total synthesis of (S)-clavulazine from d-mannitol
作者:S. Praveen Kumar、K. Nagaiah、Mukund S. Chorghade
DOI:10.1016/j.tetlet.2006.08.006
日期:2006.10
The first total synthesis of the marine natural product, (S)-clavulazine has been accomplished. d-Mannitol was used as a chiral starting material. Enantioselective zinc-mediated allylation, and ring-closing metathesis are the key steps in the synthesis. Subsequent condensation followed by dehydrogenation yielded the natural product, (S)-clavulazine.
Clavulazols A and B, Two New Pyrazine Derivatives from<i>Clavularia Viridis</i>
作者:Ya-Ching Shen、Li-Tang Wang、Yuan-Bin Cheng、Ashraf Taha Khalil、Meng-Hsien Chen、Yu-Chi Lin
DOI:10.1002/jccs.200400209
日期:2004.12
Twonew marine pyrazinederivatives, clavulazols A (4) and B (5), were isolated from ethyl acetate extract of the soft coral Clavularia viridis collected in Taiwan. The structures were determined on the basis of spectral analysis, especially 2D NMR as well as chemical conversion.
从台湾采集的软珊瑚 Clavularia viridis 的乙酸乙酯提取物中分离出两种新的海洋吡嗪衍生物克拉维唑 A (4) 和 B (5)。基于光谱分析,尤其是 2D NMR 以及化学转化确定结构。