<i>trans</i>
‐Carbocarbonation of Internal Alkynes through a Formal
<i>anti</i>
‐Carbopalladation/C−H Activation Cascade
作者:Andreas Reding、Peter G. Jones、Daniel B. Werz
DOI:10.1002/anie.201805399
日期:2018.8.13
An intramolecular Pd‐catalyzed cascade reaction is presented that consists of a formal anti‐carbopalladation of a C−C triple bond followed by C−H activation. As a result, oligocyclic ring systems with an embedded tetrasubstituted double bond are formed. The key to success in affording the trans geometry of the emerging double bond are alkyne units with residues that must not undergo β‐hydride elimination
提出了分子内Pd催化的级联反应,该反应由C-C三键的正式抗咔巴拉丁缩合,然后由C-H活化组成。结果,形成了具有嵌入的四取代双键的寡环系统。提供新兴的双键的反式几何结构成功的关键是炔烃单元,其残基必须经过β-氢化物消除(例如叔丁基或甲硅烷基)。甲硅烷基被证明是进一步转化四取代烯烃的理想方法。使用氘标记的化合物对动力学数据进行评估以及对捕集到的中间体进行X射线分析,可以进一步了解催化循环。