Cobalt-Catalyzed, Imine-Directed Olefin Hydroarylation under Grignard-Free Conditions
作者:Wengang Xu、Jie Hui Pek、Naohiko Yoshikai
DOI:10.1002/adsc.201600403
日期:2016.7.28
We report here that a cobalt catalyst generated from a cobalt(II) salt and a ligand using magnesium metal is capable of promoting hydroarylation reactions through chelation‐assisted C−H activation. With the appropriate choice of the ligand and other reaction conditions, ketimine‐ or aldimine‐directed branched selective hydroarylations of styrenes and ketimine‐directed hydroarylations of vinylsilane
Carboxylate-Assisted Ruthenium-Catalyzed Direct Alkylations of Ketimines
作者:Lutz Ackermann、Nora Hofmann、Rubén Vicente
DOI:10.1021/ol200366n
日期:2011.4.1
The mechanism of carboxylate-assistedruthenium(II)-catalyzed direct alkylations of ketimines with unactivated alkyl halides was probed through experimental studies. The remarkable chemoselectivity of the broadly applicable catalyst also enabled direct alkylations among others on H2O or under solvent-free reaction conditions.
viable within a versatile manganese(I) catalysis manifold. Thus, a wealth of fluorinated alkenes were employed in C–F/C–H functionalizations through facile C–H activation. The robust nature of the manganese(I) catalysis regime was among others reflected by the first C–F/C–H activation with perfluoroalkenes as well as racemization-free C–H functionalizations on imines, aminoacids, and peptides.
C−H/C−C functionalizations with methylenecyclopropanes (MCPs) were accomplished with a versatile base‐metal catalyst. A robust manganese(I) complex enabled the expedient annulation of MCPs by synthetically meaningful ketimines to deliver, upon one‐pot hydroarylation, densely substituted polycylic anilines in a step‐economical fashion. Mechanistic studies provided strong support for a facile organometallic
使用亚甲基环丙烷(MCP)进行C / H / C-C官能化反应是通过通用的贱金属催化剂完成的。强大的锰(I)配合物通过合成意义上的酮亚胺使MCP的便捷脱环成为可能,从而在一步锅加氢芳基化反应中以分步经济的方式提供了稠密取代的多环苯胺。机理研究为简便的有机金属CH锰提供了有力的支持,而典型的钴,钌,铑和钯催化剂被发现完全无效。