Total Synthesis of the <i>Kopsia</i> <i>lapidilecta </i>Alkaloid (±)-Lapidilectine B
作者:William H. Pearson、Yuan Mi、Ill Young Lee、Patrick Stoy
DOI:10.1021/ja016007d
日期:2001.7.1
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。该合成的显着元素包括 Smalley 叠氮基-烯醇化物环化的第一个天然产物应用,以形成 1,2-二氢-3H-吲哚-3-酮(吲哚基)核,并通过 2-氮杂烯丙基锂安装吡咯烷环。 3+2] 环加成与乙炔等价的苯基乙烯基硫醚。八元全氢阿佐辛环的闭合是通过甲磺酸盐的分子内 SN2 取代完成的。这构成了 5,6,12,13-四氢-11a,13a-ethano-3H-pyrrolo[1',2':1,8]azocino[5,4-b]indole 类成员的首次合成生物碱。