Radical and Cation Crossover Reaction System Enables Synthesis of Complex Aliphatic Chains Possessing Functionalized Quaternary Carbons
作者:Yumi Murata、Taisei Shimada、Takashi Nishikata
DOI:10.1246/bcsj.20190120
日期:2019.9.15
Controlling the reactive species during the synthesis of complex aliphatic chains containing a quaternary carbon is incredibly difficult. In this paper, we efficiently controlled both radical and c...
We report the sequence-regulated radicaladditions of tert-alkyl radicals to two different olefins controlled by a Cu catalyst, which we term the “atom-transfer radical addition–substitution” reaction. The reactions of α-bromocarbonyl compounds, such as tert-alkyl radical sources, with methacrylates and styrenes occur in a sequence-regulated manner to give the corresponding three-component product
我们报告了由 Cu 催化剂控制的叔烷基自由基对两种不同烯烃的序列调节自由基加成,我们将其称为“原子转移自由基加成-取代”反应。α-溴代羰基化合物(例如叔烷基自由基源)与甲基丙烯酸酯和苯乙烯的反应以顺序调节的方式发生,得到相应的具有跳过季碳中心的三组分产物。我们的方法为如何在受调节的脂肪链合成过程中控制叔烷基自由基的反应性提供了新的见解。
An Efficient Generation of a Functionalized Tertiary-Alkyl Radical for Copper-catalyzed Tertiary-Alkylative Mizoroki-Heck type Reaction
alpha-Halocarbonyl compounds undergo beta-hydrogen elimination to give conjugated olefins in the presence of a transition-metal catalyst. However, a copper/triamine catalyst system can induce the alkylative Mizoroki-Heck reaction of styrenes with tertiary-alkyl halides possessing a withdrawing group under very mild conditions. This reaction provides an efficient synthetic methodology for tertiary-alkylated styrenes.