An olefin, especially an activated olefin, is arylated by reaction with an arylamine, such as an aniline, in an inert polar organic solvent and in the presence of an alkyl nitrite, a hydrogen halide, and a catalytic amount of a copper catalyst having the copper in an oxidation state below +2.
Arenediazonium tetrachlorocuprates(II). Modification of the Meerwein and Sandmeyer reactions
作者:Mykola D. Obushak、Mykhaylo B. Lyakhovych、Mykola I. Ganushchak
DOI:10.1016/s0040-4039(98)02165-0
日期:1998.12
In the copper-catalysed reactions of arenediazonium chlorides with unsaturated compounds arenediazonium tetrachlorocuprates(II) are formed as intermediates. A general method of preparation of these complexed diazonium salts is described. In polar solvents these salts undergo chlorinative dediazoniation to give chloroarenes in high yield. The reaction of an arenediazonium tetrachlorocuprate(II) with
Chloride based ionic liquids as promoting agents for Meerwein reaction in solventless conditions
作者:Piero Mastrorilli、Cosimo F. Nobile、Nicola Taccardi
DOI:10.1016/j.tetlet.2006.04.072
日期:2006.7
Chloride based ionic liquids were used as chloride source in Meerweinreaction either in [bmim]X (bmim = 1-butyl-3-methylimidazolium, X = BF4, PF6) as solvents or in solventless conditions. Satisfactory yields (49–71%) with diversely substituted diazonium salts were achieved by using 1,3-dibutylimidazolium chloride in the presence of a bimetallic Zn/Cu catalyst.
Photocatalytic Radical Coupling of Organoborates with α-Halogenated Electron-Poor Olefins
作者:Marina Caldarelli、Sarah Jane Rezzi、Nicoletta Colombo、Tracey Pirali、Gianluca Papeo
DOI:10.1021/acs.joc.3c02386
日期:2024.1.5
Herein, we report the visible-light-mediated addition of organoborates to α-halogenated electron-poor olefins enabled by an environmentally benign metal-free catalyst. The method accommodates a variety of boronic acid derivatives as well as alkenes and delivers the corresponding saturated α-halo-derivatives in up to 90% yields. The obtained products are high-value building blocks in organic synthesis