Selective Synthesis of (2<i>Z</i>,4<i>E</i>)-Dienyl Esters by Ene−Diene Cross Metathesis
作者:Gustavo Moura-Letts、Dennis P. Curran
DOI:10.1021/ol062017d
日期:2007.1.1
promoted by the standard second-generation Grubbs-Hoveyda catalyst (GH-II), while a new fluorous GH-II catalyst is used for separation and recovery in gram-scale reactions. The transformation is featured in a rapid synthesis of the bottom fragments of the potent anticancer agents (-)-dictyostatin and 6-epi-dictyostatin.
[反应:见正文]末端烯烃与(2Z,4E)-己二酸甲酯和相关的二烯基酯的交叉复分解反应可提供高收率的取代的(2Z,4E)-二烯基酯。标准的第二代Grubbs-Hoveyda催化剂(GH-II)有效地促进了小规模反应,而新型氟GH-II荧光催化剂用于克级反应的分离和回收。该转化的特征在于快速合成有效的抗癌药(-)-dictyostatin和6-epi-dictyostatin的底部片段。