Enantioselective Synthesis of (−)-Vallesine: Late-Stage C17-Oxidation via Complex Indole Boronation
作者:Alyssa H. Antropow、Nicholas R. Garcia、Kolby L. White、Mohammad Movassaghi
DOI:10.1021/acs.orglett.8b01428
日期:2018.6.15
The first enantioselective total synthesis of (−)-vallesine via a strategy that features a late-stage regioselective C17-oxidation followed by a highly stereoselective transannular cyclization is reported. The versatility of this approach is highlighted by the divergent synthesis of the archetypal alkaloid of this family, (+)-aspidospermidine, and an A-ring-oxygenated derivative, (+)-deacetylaspidospermine
据报道,第一个(-)-缬氨酸的对映体选择性合成是通过一种策略,其特征在于后期区域选择性C17-氧化,然后是高度立体选择性的跨环环化。该方法的原型生物碱(+)-aspidospermidine和A-环加氧衍生物(+)-deacetylaspidospermine((-)-vallesine的前体)的不同合成突显了这种方法的多功能性常见的中间体。