Ruthenium-Catalyzed Cascade CH Functionalization of Phenylacetophenones
作者:Vaibhav P. Mehta、José-Antonio García-López、Michael F. Greaney
DOI:10.1002/anie.201309114
日期:2014.2.3
orthogonal cascade CH functionalization processes are described, based on ruthenium‐catalyzedCH alkenylation. 1‐Indanones, indeno indenes, and indeno furanones were accessed through cascade pathways by using arylacetophenones as substrates under conditions of catalytic [Ru(p‐cymene)Cl2}2] and stoichiometric Cu(OAc)2. Each transformation uses CH functionalization methods to form CC bonds sequentially
描述了基于钌催化的C H 烯基化的三个正交级联 C H 官能化过程。在催化[Ru( p-伞花烃)Cl 2 } 2 ]和化学计量的Cu(OAc) 2条件下,使用芳基苯乙酮作为底物,通过级联途径获得1-茚满酮、茚并茚和茚并呋喃酮。每个转化均使用CH功能化方法顺序形成CC键,茚并呋喃酮合成以CO键形成为终止步骤。这项工作展示了钌催化烯基化作为平台反应开发更复杂转化的能力,在单个操作中发生多个C - H官能化步骤以获得新型碳环结构。
Synthesis of Indazoles and Azaindazoles by Intramolecular Aerobic Oxidative CN Coupling under Transition-Metal-Free Conditions
A transition‐metal‐free oxidativeCN coupling method has been developed for the synthesis of 1H‐azaindazoles and 1H‐indazoles from easily accessible hydrazones. The procedure uses TEMPO, a basic additive, and dioxygen gas as the terminal oxidant. This reaction demonstrates better reactivity, functional group tolerance, and broader scope than comparable metal catalyzed reactions.
The reaction of diarylketones and benzoyltrimethylsilane is mediated by lanthanoidmetals such as ytterbium to give the deoxygenatively acylated product, 1,1-diarylacetophenones in good yields. In the reaction with acetylsilane, the corresponding silyl enol ether was obtained in a moderate yield.
Highly Regioselective, Sequential, and Multiple Palladium-Catalyzed Arylations of Vinyl Ethers Carrying a Coordinating Auxiliary: An Example of a Heck Triarylation Process
作者:Peter Nilsson、Mats Larhed、Anders Hallberg
DOI:10.1021/ja011019k
日期:2001.8.1
selective palladium-catalyzed diarylations of alkylvinylethers, and (c) a very rapid two-phase protocol for the microwave-assisted hydrolysis of amino-substituted, arylated vinylethers constituting an entry to diarylated ethanals and substituted desoxybenzoins. X-ray structures and product patterns support the suggested substrate-controlled Heck reaction pathway. The catalyst-directing alkyl dimethylamino
palladium bis(phosphinite) PCP pincer complexes are easily prepared and for the first time evaluated as homogeneous catalysts in α-arylation of ketone enolates. Apart from the total absence of phenyl–aryl exchange by-products and significantly lowcatalystloadings, the general α-arylation protocols described in this letter feature not only a broad applicability to a range of ketones and aryl bromides