Catalytic Intramolecular Coupling of Ketoalkenes by Allylic C(
<i>sp</i>
<sup>3</sup>
)−H Bond Cleavage: Synthesis of Five‐ and Six‐Membered Carbocyclic Compounds
作者:Tsuyoshi Mita、Masashi Uchiyama、Yoshihiro Sato
DOI:10.1002/adsc.201901533
日期:2020.3.17
In the presence of a catalytic amount of cobalt(II) acetylacetonate/Xantphos in combination with trimethylaluminum, various ketoalkenes underwent an intramolecular cyclization reaction triggered by cleavage of the allylic C(sp3)−H bond, affording carbocyclic compounds with high regio‐ and diastereoselectivity. Mono‐, bi‐, and tricarbocyclic compounds were produced in good yields. One of the products
在催化量的乙酰丙酮钴(II)/ Xantphos与三甲基铝结合存在的情况下,各种酮基烯烃经历了烯丙基C(sp 3)-H键断裂引发的分子内环化反应,从而提供了具有高区域和高碳环含量的碳环化合物非对映选择性。单,双和三碳环化合物的收率很高。由此获得的产物之一通过四个简单步骤被衍生为曲马多。值得注意的是,这些分子内环化反应是在连接的碳链上没有宝石二取代基的情况下发生的(没有索普-英戈尔德效应)。