描述了 chromodorolide 海洋二萜的首次全合成。二萜的核心是通过双分子自由基加成/环化/断裂级联反应构建的,该级联反应将两个复杂片段结合在一起,并在一个步骤中形成两个 CC 键和 (-)-chromodorolide B 的四个连续立体中心。该偶联步骤由氧化还原活性酯的可见光光催化裂解引发,可在铱或不太贵的富电子二氰基苯光催化剂存在下完成,并使用等摩尔量的两个加成物。计算研究指导了合成的这一核心步骤的发展,并提供了对观察到的立体选择性起源的深入了解。
Synthesis and Applications of Cyclohexenyl Halides Obtained by a Cationic Carbocyclisation Reaction
作者:Pedro Alonso、Pilar Pardo、Raquel Fontaneda、Francisco J. Fañanás、Félix Rodríguez
DOI:10.1002/chem.201702490
日期:2017.9.21
alkenyl halides (mainly fluorides, chlorides and bromides) from alkynol or enyne derivatives by an acid‐mediated cationic cyclisation reaction is disclosed. This high‐yielding, scalable and technically simple method complements and challenges conventional methodologies. This study includes the development of biomimetic cationic cyclisation reactions of polyenyne derivatives to give interesting halogen‐containing