Single- and double-chained truncated jaspine B analogues: asymmetric synthesis, biological evaluation and theoretical study of an unexpected 5-endo-dig process
作者:Yahya Salma、Stéphanie Ballereau、Sonia Ladeira、Christine Lepetit、Remi Chauvin、Nathalie Andrieu-Abadie、Yves Génisson
DOI:10.1016/j.tet.2011.04.027
日期:2011.6
An optimized synthesis of jaspine B analogues bearing an n-octyl or a p-fluorophenethyl lipophilic appendage was developed. Key to the approach was the use of acetylenic nucleophiles for the stereocontrolled introduction of the side chain and the implementation of a novel cyclization procedure to build the tetrahydrofuran ring. Three N-substituted amine or amide derivatives were also accessed. The
开发了带有正辛基或对氟苯乙基亲脂性附肢的茉莉B类似物的优化合成。该方法的关键是使用炔属亲核试剂进行侧链的立体控制引入,以及实施新颖的环化程序以构建四氢呋喃环。还获得了三种N-取代的胺或酰胺衍生物。这四种茉莉B类似物的生物活性显示出强烈依赖于两种氮的性质。-取代基和脂族部分连接到四氢呋喃环上。令人高兴的是,截短的茉莉B衍生物被证明是神经酰胺转化为鞘磷脂的促凋亡抑制剂。最后,在皂化条件下观察到根据5-内切-挖掘法有效形成稠合的双呋喃衍生物。在理论研究的基础上,划定了一个机械途径,强调了K +离子的路易斯酸度是在强碱性介质中进行此转化的驱动力。