Synthetic connections to the aromatic directed metalation reaction. Iterative ortho metalation-cross coupling tactics for the construction of polyphenyls
Directed <i>ortho</i> Metalation-Based Methodology. Halo-, Nitroso-, and Boro-Induced <i>ipso-</i>Desilylation. Link to an <i>in situ</i> Suzuki Reaction
作者:Zhongdong Zhao、Victor Snieckus
DOI:10.1021/ol0506563
日期:2005.6.1
[reaction: see text] Treatment of DoM-derived silylated aromatics 2-4 under standard electrophilic halogenation conditions cleanly affords ipso-desilyation products 5-7, while nitration of methoxy-substituted analogues 8, 9 leads to non-ipso isomers 10, 12 and 11, 13, controlled by a silicon steric effect. Sequential ipso-borodesilylation of 2a, 3a, and 20 followed by treatment with aryl halides under
A mild, efficient, and general Negishi cross coupling protocol, 4 + 5 → 6 is reported; the hydrolysis of products 6 to acetophenones demonstrates the anionicFriedel-Craftsequivalency of the overall synthetic operation.
Iridium-Catalyzed CH Activation versus Directed<i>ortho</i>Metalation: Complementary Borylation of Aromatics and Heteroaromatics
作者:Timothy E. Hurst、Todd K. Macklin、Maike Becker、Eduard Hartmann、Wolfgang Kügel、Jean-Christophe Parisienne-La Salle、Andrei S. Batsanov、Todd B. Marder、Victor Snieckus
DOI:10.1002/chem.201000401
日期:2010.7.19
Systematic studies are presented demonstrating the complementarity of directed ortho metalation (DoM) and Ir‐catalyzed strategies for the provision of borylated aromatics and their subsequent Suzuki–Miyaura coupling reactions. A new concept, the use of the TMS group, readily introduced by DoM, as a latent regiodirective moiety to overcome the otherwise problematic production of isomeric borylated product
进行了系统研究,证明了定向邻位金属化(D o M)和Ir催化策略的互补性,这些策略提供了硼化芳族化合物及其随后的Suzuki-Miyaura偶联反应。提出了一种新的概念,即由D o M容易引入的TMS基团作为潜在的区域定向基团,以克服异构化的硼酸酯化产物混合物的否则成问题的生产。附加电子试剂诱导的本位-deborylation和d ö的BPIN产品的M个反应说明。
Combined Directed <i>ortho</i> and Remote Metalation−Suzuki Cross-Coupling Strategies. Efficient Synthesis of Heteroaryl-Fused Benzopyranones from Biaryl <i>O</i>-Carbamates
作者:Clint A. James、Antonio Luiz Coelho、Matt Gevaert、Pat Forgione、Victor Snieckus
DOI:10.1021/jo900146d
日期:2009.6.5
LDA-induced migration of heterobiaryl O-carbamates 18, 21, 25, and 30 which, in turn, were prepared in good yield using a combined directed ortho lithiation (DoM)−transition-metal-catalyzed Suzuki cross-coupling strategy. An efficient and general route to a wide variety of heterocycles including coumestans 19a,c and the previously unknown isothiocoumestan ring system 22b has been thereby achieved.
Ruthenium-Catalyzed Selective Aerobic Oxidative<i>ortho</i>-Alkenylation of Substituted Phenols with Alkenes through C-H Bond Activation
作者:Mallu Chenna Reddy、Masilamani Jeganmohan
DOI:10.1002/ejoc.201201463
日期:2013.2
The oxidative coupling of phenyl carbamates and acetates with alkenes in the presence of a catalytic amount of [RuCl2(p-cymene)]2, AgSbF6, and Cu(OAc)2·H2O under air provided substituted alkene derivatives in a highly regio- and stereoselective manner. The catalytic reaction was compatible with various alkenes such as acrylates, vinyl sulfones, acrylonitrile, and substituted styrenes. The present catalytic