A Facile Microwave and SnCl2 Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones
作者:Nicholas S. O'Brien、Adam McCluskey
DOI:10.1071/ch20101
日期:——
An elegantly simple, facile, and robust approach to a scaffold of biological importance, 2,3-dihydroquinazolin-4(1H)-ones, is reported. A catalytic 1 % SnCl2/microwave-mediated approach afforded access to pure material, collected by cooling and filtration after 20-min microwave irradiation at 120°C. A total of 41 analogues were prepared in isolated yields of 17–99 %. This process was highly tolerant
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.
Cyanuric Chloride Catalyzed Mild Protocol for Synthesis of Biologically Active Dihydro/Spiro Quinazolinones and Quinazolinone-glycoconjugates
作者:Moni Sharma、Shashi Pandey、Kuldeep Chauhan、Deepty Sharma、Brijesh Kumar、Prem M. S. Chauhan
DOI:10.1021/jo2020856
日期:2012.1.20
We have developed an efficient cyanuric chloride (2,4,6-trichloro-1,3,5-triazine, TCT) catalyzed approach for the synthesis of 2,3-dihydroquinazolin-4(1H)-one (3a–3x), 2-spiroquinazolinone (5, 7), and glycoconjugates of 2,3-dihydroquinazolin-4(1H)-one (10a, 10b) derivatives. The reaction allows rapid cyclization (8–20 min) with 10 mol % cyanuric chloride to give skeletal complexity in good to excellent
Probing the catalytic activity of highly efficient sulfonic acid fabricated cobalt ferrite magnetic nanoparticles for the clean and scalable synthesis of dihydro, spiro and bis quinazolinones
作者:Priyanka Yadav、Satish K. Awasthi
DOI:10.1039/d1nj01149a
日期:——
An exceptionally productive, rapid, simple, and eco-friendly approach for the synthesis of 2,3-dihydroquinazolin-4(1H)-one has been developed utilizing acidic magnetically retrievable cobalt ferrite nanoparticles (CFNP@SO3H).
Supported N-propylsulfamic acid on magnetic nanoparticles used as recoverable and recyclable catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones in water
cyclocondensation of anthranilamide with aldehydes and ketones using N-propylsulfamic acid supported onto magnetic Fe3O4 nanoparticles (MNPs-PSA) as a recoverable and recyclable nanocatalyst in good to excellent yields in water at 70 °C. The catalyst was readily separated using an external magnet and reusable without significant loss of their catalytic efficiency.