view of these observations, an unusual [4+2] cycloaddition of the electron-rich enol 21 with singletoxygen is proposed to be responsible for the formation of products 7 and 16, while products 6, 14 and 15 arise from both the [4+2] cycloaddition and the usual Schenck ene reaction pathways. This special diene reactivity of the isoquinolinone system towards singletoxygen is further interpreted by frontier
Palladium-Catalyzed Intramolecular Hydroaminocarbonylation to Lactams: Additive-Free Protocol Initiated by Palladium Hydride
作者:Yue Hu、Zhiqiang Shen、Hanmin Huang
DOI:10.1021/acscatal.6b01939
日期:2016.10.7
A palladium-catalyzed intramolecular hydroaminocarbonylation of 2-vinylbenzylamines in the absence of acidic or any other additives was realized via rational designing the catalytic system on the basis of mechanistic studies, which allows for the synthesis of a variety of six-membered lactams in good to excellent yields with high regioselectivity. The postulated palladium-hydride intermediate for initiating