4-喹诺酮类是许多药物活性化合物的结构元素。尽管已知有几种合成方法,但在 2 位引入芳环对大多数方法来说都是有问题的。此前曾报道,在钌或钯配合物的催化下,通过加压 CO 进行邻硝基查耳酮的还原环化是实现这一目标的可行合成策略,但对加压 CO 管线和高压釜的需求阻碍了其广泛使用。在本文中,我们描述了使用甲酸/乙酸酐混合物作为 CO 替代物,这使得我们能够在廉价且市售的厚壁玻璃管中进行反应,而无需添加任何气态试剂。所获得的产率通常很高,与之前报道的使用加压 CO 的产率相比毫不逊色。该方法适用于从市售且廉价的生物碱 Graveoline 试剂进行三步合成。
One-Pot Allan-Robinson/Friedländer Route to Chromen-/Quinolin-4-ones through the Domino Acetylative Cyclisation of 2-Hydroxy-/2-Aminobenzaldehydes
作者:Vijai K. Rai、Fooleswar Verma、Ganeshwar P. Sahu、Manorama Singh、Ankita Rai
DOI:10.1002/ejoc.201701435
日期:2018.1.31
A domino reaction between 2‐hydroxy‐/2‐aminobenzaldehydes and α‐haloketones gives chromen‐4‐ones and quinolin‐4‐ones in good to excellent yields. This method represents a new extension of the Allan–Robinson and Friedländer reactions, and uses N‐heterocyclic‐carbene catalysis. This approach has the advantages of operational simplicity, ambient reaction conditions, and no by‐product formation.
From Ketones, Amines, and Carbon Monoxide to 4-Quinolones: Palladium-Catalyzed Oxidative Carbonylation
作者:Jiwei Wu、Yuchen Zhou、Ting Wu、Yi Zhou、Chien-Wei Chiang、Aiwen Lei
DOI:10.1021/acs.orglett.7b03337
日期:2017.12.1
A novel method of palladium-catalyzed oxidative carbonylation of ketones, amines, and carbon monoxide for the synthesis of 4-quinolones has been developed. This protocol provides a straightforward route to construct useful 4-quinolone derivatives from inexpensive chemicals.
Transition-Metal-Free C-3 Arylation of Quinoline-4-ones with Arylhydrazines
作者:Makthala Ravi、Parul Chauhan、Ruchir Kant、Sanjeev K. Shukla、Prem. P. Yadav
DOI:10.1021/acs.joc.5b00739
日期:2015.5.15
A transition-metal-free C-3-arylation of quinolin-4-ones in the presence of base has been achieved by usingarylhydrazines as aryl radical source and air as oxidant. The reaction proceeds smoothly at room temperature and does not require any prefunctionalization and N-protection of quinoline-4-ones. The utility of this methodology is further demonstrated in synthesis of quinoline–quinolone hybrid as
通过使用芳基肼作为芳基自由基源和空气作为氧化剂,可以在碱存在下实现喹啉-4-酮的无过渡金属C-3-芳基化。该反应在室温下平稳进行,不需要任何预官能化和喹啉-4-酮的N-保护。该方法的实用性在喹啉-喹诺酮杂化物以及6-芳基-苯并呋喃[3,2- c ]喹啉支架的合成中得到了进一步证明。
Creation of thio and selenocyanate derivatives of 4-quinolone <i>via</i> regioselective C–H bond functionalization under ambient conditions
作者:Prasanjit Ghosh、Gautam Chhetri、Aritra Kumar Nandi、Sagar Sarkar、Tilak Saha、Sajal Das
DOI:10.1039/c9nj01922g
日期:——
An operationally simple C–SCN and C–SeCN bond formation technique to generate different SCN/SeCN substituted 4-quinolone derivatives using NH4SCN/KSeCN in excellent yields was developed.
Carbonylative Sonogashira annulation sequence: One-pot synthesis of 4-quinolone and 4H-chromen-4-one derivatives
作者:Prasanjit Ghosh、Aritra Kumar Nandi、Sajal Das
DOI:10.1016/j.tetlet.2018.04.029
日期:2018.5
Carbonylative Sonogashira annulation sequence for one pot synthesis of 4-quinolone and 4H-chromen-4-one has been developed in presence of Pd-NHC catalyst. Substituted 2-iodoaniline and 2-iodophenol independently underwent in the carbonylative Sonogashira annulation reaction with a variety of acetylenes to result in 4-quinolone and flavone derivatives respectively in good to excellent yield. Moreover
在Pd-NHC催化剂的存在下,已经开发了用于一锅合成4-喹诺酮和4 H -chromen-4-one的羰基化Sonogashira环化序列。在羰基化的Sonogashira与多种乙炔的环化反应中,分别进行取代的2-碘苯胺和2-碘苯酚的合成,分别以良好或优异的收率得到4-喹诺酮和黄酮衍生物。而且,该方案不需要有毒的CO气体,高催化剂负载量和任何昂贵的盐/添加剂。本文中,我们首次使用Mo(CO)6作为固体CO源,用于通过羰基化Sonogashira环化反应一锅合成黄酮衍生物。