The total synthesis of the enantiomer of the marine sponge diterpenoid nakamurol A and determination of the absoluteconfiguration of this natural product are reported. This first synthetic entry to thelepogane-type diterpenoids involves the use of the bicyclic enone (-)-3, which after a tandem difunctionalization process and elongation of the side chain leads to the formation of the ketone (-)-13
A highly congested decalin embodying an α-methylene ketone is synthesized in 11 steps from the Wieland–Miescher ketone and efficiently converted to the polycyclic frameworks of anominine and tubingensin A, which constitutes the first approach to the skeleton of these indole diterpenoids.
由维兰德-米歇尔酮经过 11 个步骤合成了包含 α-亚甲基酮的高度稠合十氢萘,并有效转化为 anominine 和 tubegensin A 的多环骨架,这是构建这些吲哚二萜类化合物骨架的第一个方法。