diastereoselectivities. With disubstituted homoallylsilanes, tetrahydrofurans having acyclic chiral centres were also obtained. An application of this methodology to an approach towards the total synthesis of (+/−)-kumausyne is proposed on the basis of these preliminary results. The four chiral centres of this marine natural product have been set up with excellent diastereoselectivities.
已经进行了均烯丙基
硅烷的亲电5 -exo-trig环化反应,得到具有良好产率和非对映选择性的2,4-和2,4,5-取代的
四氢呋喃。用二取代的均烯丙基
硅烷,也获得具有无环手性中心的
四氢呋喃。在这些初步结果的基础上,提出了将该方法应用于(+/-)-kumausyne的全合成方法中的应用。该海洋
天然产物的四个手性中心具有出色的非对映选择性。