[EN] ORGANOZINC COMPLEXES AND PROCESSES FOR MAKING AND USING THE SAME [FR] COMPLEXES D'ORGANOZINC ET PROCÉDÉS POUR LEUR FABRICATION ET LEUR UTILISATION
Cobalt-Catalyzed Electrophilic Amination of Aryl- and Heteroarylzinc Pivalates with <i>N</i>
-Hydroxylamine Benzoates
作者:Yi-Hung Chen、Simon Graßl、Paul Knochel
DOI:10.1002/anie.201710931
日期:2018.1.22
Aryl‐ and heteroarylzincpivalates can be aminated with O‐benzoylhydroxylamines at 25 °C within 2–4 h in the presence of 2.5–5.0 % CoCl2⋅2 LiCl to furnish the corresponding tertiary arylated or heteroarylated amines in good yields. This electrophilicamination also provides access to diarylamines and aryl(heteroaryl)amines. A new tuberculosis drug candidate (Q203) was prepared in six steps and 56 %
An efficient protocol for the cobalt-catalyzed preparation of diaryl sulfides from solid organozinc pivalates and commercially available diaryl disulfides is reported. This cross-coupling proceeds at roomtemperature and displays a good functional group tolerance, allowing the preparation of a diversity of symmetrical or asymmetrical diaryl sulfides in 60–95% yield.
We report a new late‐stage functionalization of small peptides and cyclopeptides relying on the Negishi cross‐coupling of readily prepared iodotyrosine‐ or iodophenylalanine‐containing peptides with aryl‐, heteroaryl‐, and alkylzinc pivalates or halides. In silico and in vitro determinations of membrane permeability parameters of the modified cyclopeptides showed that in most cases, the solubility
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.