see text] (+)-Epolactaene was synthesized in 14 steps in the longest linear sequence. The synthesis is highlighted by a highly efficient preparation of the lactone intermediate 4, which only requires three steps from the commercially available (S)-3-butyn-2-ol. It also features a fully stereocontrolled synthesis of the intermediate 9, which was constructed through the use of Zr-catalyzed methylalumination
[反应:见正文](+)-Epolactaene以最长的线性顺序分14步合成。内酯中间体4的高效制备突显了该合成过程,该中间体仅需从市售(S)-3-butyn-2-ol中进行三个步骤即可。它还具有中间体9的完全立体控制合成,该中间体是通过使用Zr催化的
炔烃甲基铝化和一系列Pd催化的
有机锌交叉偶联反应(如均炔丙基化,直接
乙炔化和甲基的烯基化)构建的(Z)-α-iodocrotonic酸(3)的酯。