Total Synthesis of the <i>Kopsia </i><i>l</i><i>apidilecta </i>Alkaloid (±)-Lapidilectine B
作者:William H. Pearson、Ill Young Lee、Yuan Mi、Patrick Stoy
DOI:10.1021/jo048917u
日期:2004.12.1
The total synthesis of Kopsia lapidilecta alkaloid (±)-lapidilectine B is described. Notable elements of this synthesis include the first natural products application of the Smalley azido−enolate cyclization to form the 1,2-dihydro-3H-indol-3-one (indoxyl) core and installation of the pyrrolidine ring by a 2-azaallyllithium [3+2] cycloaddition with the acetylene equivalent phenyl vinyl sulfide. Closure
描述了Kopsia lapidilecta生物碱(±)-lapidilectine B的全合成。该合成过程中值得注意的元素包括首次将Smalley叠氮基-烯醇盐环化形成天然产物,以形成1,2-二氢-3 H-吲哚-3-一(吲哚)核,并通过2-氮杂烯丙基锂安装吡咯烷环[3 + 2]与乙炔当量的苯基乙烯基硫醚环加成。八元环perhydroazocine的闭合是通过分子内小号来实现Ñ甲磺酸酯的2取代。这构成了5,6,12,13-四氢-11a,13a-ethano-3 H-吡咯并[1',2':1,8]偶氮基[5,4- b ]吲哚的成员的首次合成类生物碱。