Palladium–imidazole derivatives as highly active catalysts for Heck reactions
摘要:
N-Substituted 2-(2-bromophenyl)benzimidazole derivatives have been synthesized and used in palladium catalyzed Heck reactions to give coupled products in good yields. (C) 2004 Elsevier Ltd. All rights reserved.
Palladium–imidazole derivatives as highly active catalysts for Heck reactions
摘要:
N-Substituted 2-(2-bromophenyl)benzimidazole derivatives have been synthesized and used in palladium catalyzed Heck reactions to give coupled products in good yields. (C) 2004 Elsevier Ltd. All rights reserved.
Benzimidazole Nitrogen-Directed, Regiocontrolled, Lithiation of Ferrocenyl- and Phenyl-<i>N</i>-<i>n</i>-butylbenzimidazoles
作者:Damien Hérault、Karel Aelvoet、Alexandrea J. Blatch、Abdullah Al-Majid、Christian A. Smethurst、Andrew Whiting
DOI:10.1021/jo061639+
日期:2007.1.1
synthesized to evaluate the influence of the benzimidazole functional group upon their directed lithiation. The regiochemistry of lithiation was studied, as well as the effect of stabilization of the lithiated species by diamine coordination using tetramethyl- ethylenediamine and (−)-sparteine. The lithiations were followed by reaction with a variety of electrophiles to give the disubstituted 2-ferrocenyl-
Synthesis and structure of bifunctional N-alkylbenzimidazole phenylboronate derivatives
作者:Alexandrea J. Blatch、Olga V. Chetina、Judith A. K. Howard、Leonard G. F. Patrick、Christian A. Smethurst、Andrew Whiting
DOI:10.1039/b607127a
日期:——
N-Methyl and N-n-butyl-2-(2-boronophenyl)benzimidazoles are accessed from the corresponding mono-N-alkyl-ortho-phenylenediamines, either using a polyphosphoric acid-mediated cyclisation with ortho-bromobenzoic acid, or preferably using an Oxone™-mediated cyclisation of the corresponding aldehyde, followed by a lithium-exchange and borylation sequence. The resulting boronic acids show unusual physical and chemical properties, as shown by 11B NMR and X-ray crystallography.
N-甲基和 N-正丁基-2-(2-硼酸苯基)苯并咪唑是从相应的单 N-烷基正苯二胺中获得的,可以使用聚磷酸介导的与正溴苯甲酸的环化反应,或者最好使用 Oxone™ 介导的相应醛的环化反应,然后进行锂交换和硼酸化反应。如 11B NMR 和 X 射线晶体学所示,生成的硼酸具有不同寻常的物理和化学特性。
Bifunctional Lewis acid - Lewis base catalyst of Formula (I): wherein O is a C2-60 optionally heteroatom containing substituted or unsubstituted hydrocarbon scaffold comprising pendant or integral bifunctional groups LA and LB wherein LA is a pendant or integral boron or silicon Lewis acid group and LB is a pendant or integral phosphorus or nitrogen Lewis base group and its salts, N-fanctionalised derivatives, dimer or oligomer thereof; processes for the preparation thereof; novel compounds and novel intermediates; a composition comprising a catalyst or compound of the invention; a kit comprising one or more catalysts; the use thereof as catalysts in selective transformations, kits therefor and processes for selective transformation reactions catalysed thereby; screening methods to identify catalysts for specific transformations; and kits therefor.
[EN] BIFUNCTIONAL AMINO-BORON LEWIS ACID - LEWIS BASE CATALYST<br/>[FR] CATALYSEURS BIFONCTIONNELS
申请人:UNIV DURHAM
公开号:WO2004113351A3
公开(公告)日:2005-04-07
Palladium–imidazole derivatives as highly active catalysts for Heck reactions
作者:K. Rajender Reddy、G. Gopi Krishna
DOI:10.1016/j.tetlet.2004.11.124
日期:2005.1
N-Substituted 2-(2-bromophenyl)benzimidazole derivatives have been synthesized and used in palladium catalyzed Heck reactions to give coupled products in good yields. (C) 2004 Elsevier Ltd. All rights reserved.