Olefin Cross-Metathesis as a Tool in Natural Product Degradation. The Stereochemistry of (+)-Falcarindiol
作者:Anokha S. Ratnayake、Thomas Hemscheidt
DOI:10.1021/ol027033z
日期:2002.12.1
olefin cross-metathesis using Grubbs' second generation catalyst and ethylene gas to degrade falcarindiol to the symmetrical 1,9-decadiene-4,6-diyne-3,8-diol. The reaction is completely selective for net removal of the aliphatic side chain. Degradation of (+)-falcarindiol from Tetraplasandra hawaiiensis yields a meso product as shown by chiral HPLC. Hence, (+)-falcarindiol from this source has a (3R,8S)-configuration
[反应:见正文]文献中关于普通植物聚乙炔氧脂(+)-法卡林二醇在C-3处的绝对立体化学的报道相互矛盾。我们已经使用了Grubbs第二代催化剂和乙烯气体进行烯烃交叉复分解反应,将泛醇分解为对称的1,9-癸二烯-4,6-二炔-3,8-二醇。对于脂族侧链的净去除,该反应是完全选择性的。如手性HPLC所示,从夏威夷四味松(Tetraplasandra hawaiiensis)中降解(+)-法卡林二醇产生了内消旋产物。因此,来自该来源的(+)-心果二醇具有(3R,8S)-构型。