Synthesis of Neurotrophic <i>Seco</i>-prezizaane Sesquiterpenes (1<i>R,</i>10<i>S</i>)-2-Oxo-3,4-dehydroneomajucin, (2<i>S</i>)-Hydroxy-3,4-dehydroneomajucin, and (−)-Jiadifenin
作者:Xiayun Cheng、Glenn C. Micalizio
DOI:10.1021/jacs.5b12694
日期:2016.2.3
An asymmetric approach to the synthesis of neurotrophic seco-prezizaane sesquiterpenes is described that is based on the strategic application of a hydroxyl-directed metallacycle-mediated [2 + 2 + 2] annulation and an intramolecular radical cyclization cascade. Targets prepared are among the most potent members of the natural product class and include (1R,10S)-2-oxo-3,4-dehydroneomajucin, (2S)-hydroxy-3
描述了一种合成神经营养性 seco-prezizaane 倍半萜的不对称方法,该方法基于羟基导向的金属环介导的 [2 + 2 + 2] 环化和分子内自由基环化级联的战略应用。制备的靶标是天然产物类中最有效的成员之一,包括 (1R,10S)-2-oxo-3,4-dehydroneomajucin、(2S)-hydroxy-3,4-dehydroneomajucin 和 (-)-jiadifenin。除了代表醇盐导向的金属环介导的氢化茚环化反应在天然产物合成中的首次应用和 (2S)-羟基-3,4-脱氢酮玛珠素的首次全合成外,这些追求还阐明了一个复杂的自由基级联过程,用于安装天然产物类常见的 C5 四元中心。