Palladium-Catalyzed Incorporation of Two C1 Building Blocks: The Reaction of Atmospheric CO<sub>2</sub> and Isocyanides with 2-Iodoanilines Leading to the Synthesis of Quinazoline-2,4(1<i>H</i>,3<i>H</i>)-diones
作者:Pei Xu、Fei Wang、Tian-Qi Wei、Ling Yin、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.7b01877
日期:2017.9.1
insertion and cycloaddition of CO2 and isocyanide into 2-iodoanilines under atmospheric pressure has been developed and affords quinazoline-2,4(1H,3H)-diones through the formation of new C–C, C–O, and C–N bonds under mild conditions. This reaction provides a new and practical method not only for the construction of quinazoline-2,4(1H,3H)-diones but also for the efficient utilization of carbon dioxide.
Palladium-Catalyzed Cyclization Reaction of <i>o</i>
-Haloanilines, CO<sub>2</sub>
and Isocyanides: Access to Quinazoline-2,4(1<i>H</i>
,3<i>H</i>
)-diones
作者:Wen-Zhen Zhang、Honglin Li、Yang Zeng、Xueyan Tao、Xiaobing Lu
DOI:10.1002/cjoc.201700581
日期:2018.2
important compounds. The reaction of 2‐aminobenzonitrile and CO2, which was frequently studied, only provided N3‐unsubstituted quinazoline‐2,4(1H,3H)‐dione compounds. Herein we report palladium‐catalyzed cyclizationreactions of o‐haloanilines, CO2 and isocyanides to prepare N3‐substituted quinazoline‐2,4(1H,3H)‐diones. Electron‐rich o‐bromoanilines participated in the cyclizationreaction using Cs2CO3 at
Combining Isocyanides with Carbon Dioxide in Palladium-Catalyzed Heterocycle Synthesis: <i>N</i>3-Substituted Quinazoline-2,4(1<i>H</i>,3<i>H</i>)-diones via a Three-Component Reaction
作者:Pieter Mampuys、Helfried Neumann、Sergey Sergeyev、Romano V. A. Orru、Haijun Jiao、Anke Spannenberg、Bert U. W. Maes、Matthias Beller
DOI:10.1021/acscatal.7b01503
日期:2017.8.4
We report a Pd-catalyzed three-component reaction of 2-bromoanilines, carbon dioxide, and isocyanides. The combination of these two readily available C1-reactants, featuring a huge difference in kinetic and thermodynamic stability, is hitherto unprecedented in transition-metal catalysis. With this one-potthree-component reaction, N3-substituted quinazoline-2,4(1H,3H)-diones are obtained in moderate
an attractive way for both converting CO2 and producing quinazolinones, which are key intermediates for the synthesis of various biologically active products. However, the heterogeneous and relatively inert nature of CO2 with 2-haloaniline and isocyanide reactants limits the types of suitable catalysts. Herein, we use metal–organicframeworks (MOFs) as a “microreactor”, in which Pd(PPh3)2Cl2 is well-dispersed
CO 2 的管理在本世纪引起了极大的关注。CO 2与 2-卤代苯胺和异氰化物的反应是转化 CO 2和生产喹唑啉酮的一种有吸引力的方式,喹唑啉酮是合成各种生物活性产品的关键中间体。然而,CO 2与2-卤代苯胺和异氰化物反应物的非均相和相对惰性的性质限制了合适催化剂的类型。在此,我们使用金属有机骨架 (MOF) 作为“微反应器”,其中 Pd(PPh 3 ) 2 Cl 2作为单分子催化剂良好分散,反应物通过“准分子”在分子水平上发生反应。 -均质”方式转化 CO2在温和条件下转化为喹唑啉酮,在均相催化剂上具有良好的收率和作为非均相反应的良好可回收性。MOF 辅助的单分子催化策略应有助于 CO 2转化、喹唑啉酮类生物活性中间体的生产以及“均相和非均相”催化的划时代发展。
Catalytic formation of N3-substituted quinazoline-2,4(1<i>H</i>,3<i>H</i>)-diones by Pd(<scp>ii</scp>)EN@GO composite and its mechanistic investigations through DFT calculations
and 2-iodoaniline in a one-pot reaction for the synthesis of quinazoline-2,4(1H,3H)-dione derivatives is a straight forward and attractive methodology to avoid multi-step and more toxic reagent containing routes. In this study, a heterogeneous catalyst was designed and synthesized from aminically modified grapheneoxide by the incorporation of palladium metal. The catalyst was characterized by FT-IR
在当前时代,科学界非常感兴趣通过化学固定利用温室气体二氧化碳来生产基于价值的精细有机化学品。一锅式反应中大气二氧化碳,异氰化物和2-碘苯胺的化学结合,用于合成喹唑啉-2,4(1 H,3 H)-二酮衍生物,是避免多分子反应的一种直接且有吸引力的方法步骤和含有更多毒性试剂的途径。在这项研究中,通过并入钯金属,由胺改性的氧化石墨烯设计并合成了一种非均相催化剂。通过FT-IR,XRD,ICP-AES,拉曼光谱,XPS,TEM,SEM,EDX和N 2对催化剂进行了表征。吸收解吸研究。在该报告中,在温和且非均相的反应条件下,在1 bar CO 2压力下,进行了N3取代的2,4(1 H,3 H)-喹唑啉二酮的形成。该催化剂非常有效地生产喹唑啉衍生物。为了研究催化反应的机理,还监测了密度泛函理论(DFT)的计算。我们已经检查了催化剂的可回收性,结果表明该催化剂甚至在使用六个循环后仍保持其催化效力。