这项研究描述了天然存在的二苯乙烯 A、B 和 C 的首次有效合成。二苯乙烯骨架是使用 Horner-Wadsworth-Emmons 反应制备的。根据比旋光度,确定乌二苯乙烯 A 和 C 的绝对构型均为R,而乌二苯乙烯 B 的绝对构型确定为 4a S,9a R。合成的化合物对选定的人类癌细胞系表现出细胞毒活性。
这项研究描述了天然存在的二苯乙烯 A、B 和 C 的首次有效合成。二苯乙烯骨架是使用 Horner-Wadsworth-Emmons 反应制备的。根据比旋光度,确定乌二苯乙烯 A 和 C 的绝对构型均为R,而乌二苯乙烯 B 的绝对构型确定为 4a S,9a R。合成的化合物对选定的人类癌细胞系表现出细胞毒活性。
Exploration of Cascade Cyclizations Terminated by Tandem Aromatic Substitution: Total Synthesis of (+)-Schweinfurthin A
作者:Joseph J. Topczewski、John G. Kodet、David F. Wiemer
DOI:10.1021/jo1022102
日期:2011.2.4
The termination of epoxide-initiated cascade cyclizations with a range of "protected" phenols is described. When the protecting group can be lost as a stabilized electrophile, the cascade process continues beyond ring closure to afford products which have undergone a tandem electrophilic aromatic substitution. A number of groups have proven viable in this process and the regiochemistry of their substitution reactions has been studied. Application of this methodology in the first total synthesis of (+)-schweinfurthin A, a potent antiproliferative agent, has been achieved.