Ligand-Free Ru-Catalyzed Direct sp<sup>3</sup> C–H Alkylation of Fluorene Using Alcohols
作者:Moseen A. Shaikh、Sandip G. Agalave、Akash S. Ubale、Boopathy Gnanaprakasam
DOI:10.1021/acs.joc.9b02913
日期:2020.2.21
to excellent isolated yield (26 examples, 50-92% yield), whereas this reaction with secondary alcohols in the absence of any external oxidants furnished the tetrasubstituted alkene as the major product. Furthermore, a base-mediated C-H hydroxylation of the synthesized 9H-fluorene derivatives afforded 9H-hydroxy-functionalized quaternary fluorene derivatives in excellent yield.
已经描述了通过借用氢概念使用醇和Ru催化剂使9 H-芴的sp 3 CH烷基化。该反应被[Ru(对-cymene)Cl2] 2络合物(3 mol%)催化,并显示出与不同醇的广泛反应范围,使伯醇和仲醇可用作无害且绿色的烷基化剂,形成了副产品是对环境无害的水。各种9H-芴与伯醇的选择性和排他单C9-烷基化反应具有良好的分离效果(26例,产率为50-92%),而在没有任何外部氧化剂的情况下,与仲醇的反应提供了四取代烯烃为主要产物。此外,