已经开发了通过有氧氧化裂解产生芳基甲二酸或串联好氧氧化/苯甲酸重排/脱羧以产生二芳基甲酮的二芳基酮的化学选择性转化。该转化是可控的,并且适用于广泛范围的底物,并以良好至优异的产率提供所需的产物。具有控制反应的机械洞察力,11 H NMR追踪和单晶X射线衍射揭示了一个复杂的机理网络,其中提出并验证了两个常见的中间体,α-酮氢过氧化物和二芳基乙二酮,以及三个可能的途径。这些途径是相互联系的,可以通过改变反应条件来合理地切换。这种方法能够实现可扩展的合成并获得许多有价值的化合物,包括维生素B 3,苯二酸和非甾体抗炎药酮洛芬。本协议代表了在利用复杂的机械网络来控制反应路径,从同一类起始原料获得不同合成方法方面迈出的一步。
[EN] NOVEL PRECATALYST SCAFFOLDS FOR CROSS-COUPLING REACTIONS, AND METHODS OF MAKING AND USING SAME<br/>[FR] NOUVEAUX SUPPORTS DE PRÉ-CATALYSEURS POUR RÉACTIONS À COUPLAGE MUTUEL, ET LEURS PROCÉDÉS DE FABRICATION ET D'UTILISATION
申请人:UNIV YALE
公开号:WO2016057600A1
公开(公告)日:2016-04-14
The present invention provides novel transition-metal precatalysts that are useful in preparing active coupling catalysts. In certain embodiments, the precatalysts of the invention are air-stable and moisture-stable. The present invention further provides methods of making and using the precatalysts of the invention.
Palladium-Catalyzed Direct α-C(sp3) Heteroarylation of Ketones under Microwave Irradiation
作者:Andrew Quillen、Quynh Nguyen、Matthew Neiser、Kara Lindsay、Alexander Rosen、Stephen Ramirez、Stefana Costan、Nathan Johnson、Thuy Donna Do、Oscar Rodriguez、Diego Rivera、Abdurrahman Atesin、Tülay Aygan Ateşin、Lili Ma
DOI:10.1021/acs.joc.9b00446
日期:2019.6.21
building blocks in medicinal chemistry and chemical industry. A palladium-catalyzed direct α-C(sp3) heteroarylation of ketones under microwave irradiation is developed and reported in this study. Under optimized conditions, twenty-eight (28) heteroarylated ketones were prepared in this study to demonstrate the substrate scope of this reaction. The ground-state optimized structure of Pd(0) active catalyst
Selective Monoarylation of Acetate Esters and Aryl Methyl Ketones Using Aryl Chlorides
作者:Mark R. Biscoe、Stephen L. Buchwald
DOI:10.1021/ol900295u
日期:2009.4.16
Simple, efficient procedures for the monoarylation of acetate esters and arylmethyl ketones using arylchlorides are presented. Previously, no general method was available to ensure the highly selective monoarylation of these classes of substrates using arylchlorides. Using palladium precatalysts recently reported by our group, these reactions are easily accomplished under mild conditions that tolerate
Photoinduced direct hydration of dipyridylacetylenes in acidic aqueous solution
作者:Ya Li、Zimu Su、Haijun Hao、Junpeng Zhuang
DOI:10.1039/d0cc01351j
日期:——
Photoinduced direct hydration of dipyridylacetylenes (DPAs) in acidicaqueoussolution was achieved upon UV irradiation at room temperature. This is a catalyst-free reaction with moderate-to-good yields, and asymmetric dipyridylacetylenes afford the corresponding Markovnikov addition products.
Novel regioselective hydrodeoxygenation of α-diketones with phosphites as the deoxygenation reagent was realized via visible-light photoredox catalysis. Broad substrate scope and high functional group compatibility were obtained. Unsymmetric α-diketones were selectively reduced at the carbonyls of higher electrophilicity. This unique regioselectivity compared with available methods makes it a practical