Cu(II)-Catalyzed Functionalizations of Aryl C−H Bonds Using O<sub>2</sub> as an Oxidant
作者:Xiao Chen、Xue-Shi Hao、Charles E. Goodhue、Jin-Quan Yu
DOI:10.1021/ja061715q
日期:2006.5.1
Cu(II)-catalyzed acetoxylation and halogenation of aryl C-H bonds are developed. ortho-Selectivity was observed with a wide range of 2-arylpyridine substrates. Both mono- and difunctionalizations are achieved by tuning the reaction conditions. Excellent functional group tolerance and use of O2 as a stoichiometric oxidant are significant advantages over our recently developed Pd-catalyzed C-H functionalization reactions. These newly discovered reaction conditions are also applicable for cyanation, amination, etherification, and thioetherification of aryl C-H bonds. Mechanistic investigations are carried out to gain insights into the Cu(II)-catalyzed C-H functionalization reactions.
WO2007/123910
申请人:——
公开号:——
公开(公告)日:——
[EN] COPPER-MEDIATED FUNCTIONALIZATION OF ARYL C-H BONDS, AND COMPOUNDS RELATED THERETO<br/>[FR] FONCTIONNALISATION INDUITE PAR LE CUIVRE DE LIAISONS C-H D'UN GROUPE ARYLE ET COMPOSES CORRESPONDANTS
申请人:UNIV BRANDEIS
公开号:WO2007123910A2
公开(公告)日:2007-11-01
[EN] One aspect of the present invention relates to methods for direct functionalization of pyridyl-substituted aromatic compounds. In certain embodiments, 2-arylpyridine substrates react with anionic nucleophiies in the presence of copper(II) to furnish substituted arylpyridines. In other embodiments, the present invention allows for both mono- and di- functionalizations from manipulation of the reaction conditions. The transition metal- mediated carbon-heteroatom bond-forming methods are applicable to a variety of synthetic transformations of aryl C-H bonds. [FR] Selon un aspect, la présente invention concerne des procédés de fonctionnalisation directe de composés aromatiques substitués par un groupe pyridyle. Dans certains modes de réalisation, les substrats 2-arylpyridine réagissent avec des nucléophiles anioniques en présence de cuivre (II) de façon à donner des arylpyridines substituées. Dans d'autres modes de réalisation, la présente invention permet d'obtenir tant des mono- que des di-fonctionnalisations en manipulant les conditions de la réaction. Les procédés de formation de liaison carbone-hétéroatome induite par un métal de transition peuvent être appliqués à une variété de transformations synthétiques de liaisons C-H d'un groupe aryle.
Cu-Mediated Direct Aryl CH Halogenation: a Strategy to Control Mono- and Di-Selectivity
作者:Zhi-Jun Du、Lian-Xun Gao、Ying-Jie Lin、Fu-She Han
DOI:10.1002/cctc.201300734
日期:2014.1
A protocol for the copper‐mediated directarylCHhalogenation is presented. Highly selective mono‐ and di‐halogenations are achieved by using acyl hypohalites, generated in situ from the readily available carboxylic acid and N‐halosuccinimides (NXS; X=Br and Cl) as powerful halogenating reagents. The correct choice of carboxylic acid additives and solvents is essential for both high yield and selectivity
提出了铜介导的直接芳基CH卤化的方案。通过使用酰基次卤酸盐来实现高度选择性的单卤化和二卤化,酰基次卤酸盐是由现成的羧酸和N-卤代琥珀酰亚胺(NXS; X = Br和Cl)原位生成的,作为强力卤化试剂。正确选择羧酸添加剂和溶剂对于高收率和选择性都至关重要。因此,使用廉价的铜催化剂和从容易负担得起且易于处理的羧酸和NXS(X = Br和Cl)原位生成酰基次卤酸盐卤化试剂的新策略为实际应用提供了优势。