作者:Scott D. Rychnovsky、Kooksang Hwang
DOI:10.1021/jo00097a052
日期:1994.9
(+/-)-Combretastatin D-1 was synthesized in 16 steps by way of its congener, combretastatin D-2. In the key step, the strained 15-membered lactone ring was formed using high-dilution Mitsunobu conditions in 89% yield. Saturated seco acid 4 was a much better substrate for the cyclization reaction than the unsaturated seco acid 3.
(±)-Combretastatin D-1 是通过其同系物 combretastatin D-2 经过 16 步合成的。在关键步骤中,使用高稀释度的 Mitsunobu 条件,以 89% 的收率形成了高度应变的 15 元环状酯。饱和的裂环酸 4 是环化反应比不饱和的裂环酸 3 好得多的底物。