Synthesis and characterization of VO–vanillin complex immobilized on MCM‐41 and its facile catalytic application in the sulfoxidation reaction, and synthesis of 2,3‐dihydroquinazolin‐4(1
<i>H</i>
)‐ones and disulfides in green media
作者:Mohsen Nikoorazm、Maryam Khanmoradi
DOI:10.1002/jccs.201900531
日期:2020.8
as a green oxidant) and also a suitable catalyst for the preparation of 2,3‐dihydroquinazolin‐4(1H )‐one derivatives in water at 90°C. Using this protocol, we show that a variety of disulfides, sulfoxides, and 2,3‐dihydroquinazolin‐4(1H )‐one derivatives can be synthesized in green conditions. The catalyst can be recovered and recycled for further reactions without appreciable loss of catalytic performance
Heterogeneous Cu(<scp>ii</scp>)/<scp>l</scp>-His@Fe<sub>3</sub>O<sub>4</sub> nanocatalyst: a novel, efficient and magnetically-recoverable catalyst for organic transformations in green solvents
A novel, efficient and green Cu(II)/L-His@Fe3O4 catalyst has been applied successfully in the synthesis of heterocyclic compounds. The resulting catalyst was used in the synthesis of 2,3-dihydroquinazolin-4(1H)-ones, polyhydroquinolines and 2-amino-6-(arylthio)pyridine-3,5-dicarbonitriles as biologically interesting compounds. The present research is focused on investigation of recycling, reusability
一种新颖,高效,绿色的Cu(II)/ L- His @ Fe 3 O 4催化剂已成功用于杂环化合物的合成。所得催化剂用于合成2,3-二氢喹唑啉-4(1H)-酮,聚氢喹啉和2-氨基-6-(芳硫基)吡啶-3,5-二碳腈作为生物学上感兴趣的化合物。本研究的重点是研究相反应中催化剂的循环利用,可重复使用性和稳定性。Cu(II)/ L -His @ Fe 3 O 4该催化剂至少使用了六次,其活性与新鲜催化剂相当。通过TGA / DTG,EDS,XRD,VSM,FT-IR和SEM对催化剂的化学组成和结构进行了分析。
Synthesis of 2,3-dihydroquinazolin-4(1H)-ones catalyzed by succinimide-N-sulfonic acid as a mild and efficient catalyst
A simple, green and environmentally benign procedure was developed for the synthesis of 2,3-dihydro-2-phenylquinazolin-4(1H)-ones using catalytic amounts of succinimide-N-sulfonic acid via the cyclocondensation of 2-aminobenzamide with an aldehyde. The present methodology offers several advantages such as high yields, simple procedure, low cost, short reaction times, mild reaction conditions, and use of a reusable catalyst.
A novel protocol for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones from 2-aminobenzamides and aldehyde derivatives catalyzed by KOH/DMSO suspension has been developed. The present transition metal free methodology is operationally simple, scalable and varieties of 2,3-dihydroquinazolin-4(1H)-one derivatives were obtained in good to excellent yields in short reaction times.
Copper-Catalyzed One-Pot Synthesis of Quinazolinones from 2-Nitrobenzaldehydes with Aldehydes: Application toward the Synthesis of Natural Products
作者:Subrata Sahoo、Shantanu Pal
DOI:10.1021/acs.joc.1c02343
日期:2021.12.17
A novel, efficient, and atom-economical approach for the construction of quinazolinones from 2-nitrobenzaldehydes has been unveiled via copper-catalyzed nitrile formation, hydrolysis, and reduction in onepot for the first time. In this reaction, urea is used as a source of nitrogen for nitrile formation, hydrazine hydrate is used for both the reduction of the nitro group and the hydrolysis of nitrile
首次通过铜催化的腈形成、水解和还原在一个锅中揭示了一种从 2-硝基苯甲醛构建喹唑啉酮的新型、高效和原子经济的方法。在该反应中,尿素用作生成腈的氮源,水合肼用于硝基的还原和腈的水解,大气中的氧气用作唯一的氧化剂。该方法描绘了具有良好官能团耐受性的宽底物范围。此外,该方法还用于合成裂殖菌素、色胺菊酯、phaitanthrin-A、phaitanthrin-B和8 H-喹唑啉[4,3 - b ]quinazolin-8-one。