[EN] ORGANOZINC COMPLEXES AND PROCESSES FOR MAKING AND USING THE SAME [FR] COMPLEXES D'ORGANOZINC ET PROCÉDÉS POUR LEUR FABRICATION ET LEUR UTILISATION
Nickel-catalyzed cross-coupling reactions of benzylic zinc reagents with aromatic bromides, chlorides and tosylates
作者:Matthias A. Schade、Albrecht Metzger、Stephan Hug、Paul Knochel
DOI:10.1039/b803072c
日期:——
Benzylic zinc reagents prepared by direct insertion of zinc to benzylic chlorides in the presence of LiCl undergo smooth cross-coupling reactions with aromatic chlorides, bromides and tosylates using Ni(acac)(2) and PPh(3) as a catalyst system.
ORGANOZINC COMPLEXES AND PROCESSES FOR MAKING AND USING THE SAME
申请人:Knochel Paul
公开号:US20140031545A1
公开(公告)日:2014-01-30
Processes for making an organozinc reagents are disclosed comprising reacting (A) organomagnesium or organozinc complexes with (B) at least one coordination compound comprising one or more carboxylate groups and/or alcoholate groups and/or tertiary amine groups, optionally in combination with zinc ions and/or lithium ions and/or halide ions, wherein the halide ions are selected from chloride, bromide and iodide, the organozinc complex comprises an aryl group, a heteroaryl group or a benzyl group when the coordinating compound is a chelating polyamine, and the reaction is conducted in the presence of zinc complexed with at least one coordinating compound when reactant (A) comprises at least one organomagnesium complex. The resulting organozinc reagents may optionally be isolated from solvents to obtain a solid reagent. The reagents may be used for making organic compounds via Negishi cross-coupling reactions or via aldehyde and/or ketone oxidative addition reactions. The organozinc reagents are stable and, due to their high selectivity, permit maintenance of sensitive functional groups such as aldehydes during cross-coupling.
[EN] ORGANOZINC COMPLEXES AND PROCESSES FOR MAKING AND USING THE SAME<br/>[FR] COMPLEXES D'ORGANOZINC ET PROCÉDÉS POUR LEUR FABRICATION ET LEUR UTILISATION
申请人:UNIV MUENCHEN L MAXIMILIANS
公开号:WO2012085168A1
公开(公告)日:2012-06-28
Processes for making an organozinc reagents are disclosed comprising reacting (A) organomagnesium or organozinc complexes with (B) at least one coordination compound comprising one or more carboxylate groups and/or alcoholate groups and/or tertiary amine groups, optionally in combination with zinc ions and/or lithium ions and/or halide ions, wherein the halide ions are selected from chloride, bromide and iodide, the organozinc complex comprises an aryl group, a heteroaryl group or a benzyl group when the coordinating compound is a chelating polyamine, and the reaction is conducted in the presence of zinc complexed with at least one coordinating compound when reactant (A) comprises at least one organomagnesium complex. The resulting organozinc reagents may optionally be isolated from solvents to obtain a solid reagent. The reagents may be used for making organic compounds via Negishi cross-coupling reactions or via aldehyde and/or ketone oxidative addition reactions. The organozinc reagents are stable and, due to their high selectivity, permit maintenance of sensitive functional groups such as aldehydes during cross-coupling.