E, highly cytotoxic isomalabaricane triterpenoids, have been accomplished in a linear sequence of 14 steps from commercial geranylacetone. The exceptionally strained trans-syn-trans-perhydrobenz[e]indene core characteristic of the isomalabaricanes is efficiently accessed in a selective manner through a rapid, complexity-generating sequence. This process features a reductive radical polyene cyclization
(±)-rhabdastrellic acid A 和 (±)-stelletin E 是高细胞毒性异麦芽三
萜类化合物的第一次全合成,已从商业香叶
丙酮以 14 步的线性序列完成。异马拉巴烷的异常紧张的反式-syn-trans-perhydrobenz[e]indene 核心特征通过快速、产生复杂性的序列以选择性方式有效访问。该过程具有还原性自由基多烯环化、前所未有的氧化 Rautenstrauch 环化异构化和对
甲苯磺酰腙的 umpolung 取代与原位还原转位。