Regioselective hydroboration of a 4-methyl-2-alkene, oxidation of the resulting mixture of isomeric alcohols, and finally diastereoselective reduction of the ketone are the key steps in the stereoselective synthesis of C19-C26 fragment of amphidinolide B which was coupled with the C14-C18 fragment leading to the first synthesis of the entire C14-C26 moiety of this important molecule.
4-甲基-2-烯烃的区域选择性
硼氢化、所得异构醇混合物的氧化以及最终酮的非对映选择性还原是与 C14 偶联的两栖内酯 B 的 C19-C26 片段立体选择性合成的关键步骤-C18 片段导致这个重要分子的整个 C14-C26 部分的首次合成。