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.
Glucose as an Eco‐Friendly Reductant in a One‐Pot Synthesis of 2,3‐Dihydroquinazolin‐4(1
<i>H</i>
)‐ones
作者:Thiago dos Santos、Caroline Grundke、Tobias Lucas、Luca Großmann、Giuliano Cesar Clososki、Till Opatz
DOI:10.1002/ejoc.202000970
日期:2020.11.8
The synthesis of 2,3‐dihydroquinazolin‐4(1H)‐ones in a one‐pot cascade manner (nitrile hydration, nitro‐reduction, imine formation, and cyclocondensation) is reported. Glucose, a renewable resource, can be easily obtained from abundant lignocellulosic biomass and was employed as a mild reductant in alkaline aqueous medium with 2‐nitrobenzonitrile.