Total synthesis of (±)-nakamurol-A and its 13-epimer: tentative assignment of the C-13 relative configuration
作者:Josep Bonjoch、Javier Cuesta、Sandra Dı́az、Asensio González
DOI:10.1016/s0040-4039(00)00885-6
日期:2000.7
A general approach to the structure of thelepogan-type diterpenoids has been developed and its application to the first total synthesis of (±)-nakamurol-A is described. The key steps involve: (i) a diastereoselective dimethylzinc addition to an endocyclic enone followed by enolate trapping; (ii) a Sakurai allylation of an exocyclic enone; and (iii) a Wacker chemoselective oxidation. The 1H NMR data
已经开发了一种对lepogan型二萜类化合物的结构的一般方法,并描述了其在(±)-nakamurol-A的第一个全合成中的应用。关键步骤包括:(i)将非对映选择性的二甲基锌添加到环内烯酮中,然后进行烯醇化物捕获;(ii)环烯酮的樱井烯丙基化;(iii)瓦克化学选择性氧化。合成的萘那莫洛尔A及其C-13差向异构体的1 H NMR数据初步确定了天然产物C-13处的相对构型。