Bromine-Radical-Mediated Synthesis of β-Functionalized β,γ- and δ,ε-Unsaturated Ketones via C–H Functionalization of Aldehydes
作者:Takashi Kippo、Yuki Kimura、Mitsuhiro Ueda、Takahide Fukuyama、Ilhyong Ryu
DOI:10.1055/s-0036-1588494
日期:2017.9
V-65 as radical initiator, the reaction of aldehydes with allyl bromides gave β,γ-unsaturated ketones in good yields (13 examples, 45–84%). The reaction is triggered by hydrogen abstraction from the aldehyde by bromine radical to form an acyl radical, which undergoes an SH2′-type addition–elimination reaction with allyl bromides to give coupling products with liberation of bromine radical. Three-component
研究了溴自由基介导的醛烯丙基化反应。在 V-65 作为自由基引发剂的存在下,醛与烯丙基溴的反应以良好的产率得到 β,γ-不饱和酮(13 个实例,45-84%)。该反应是通过溴自由基从醛中夺取氢以形成酰基自由基引发的,酰基自由基与烯丙基溴进行 SH2' 型加成消除反应,得到偶联产物并释放溴自由基。包括醛、缺电子烯烃和甲代烯丙基溴的三组分偶联反应也进行得到δ,e-不饱和酮。