Cu(II) immobilized on Fe<sub>3</sub>
O<sub>4</sub>
-diethylenetriamine: A new magnetically recoverable catalyst for the synthesis of 2,3-dihydroquinazolin-4(1<i>H</i>
)-ones and oxidative coupling of thiols
Cu(II) immobilized on Fe3O4–diethylenetriamine was designed as a new, inexpensive and efficient heterogeneous catalyst for the synthesis of 2,3‐dihydroquinazolin‐4(1H)‐ones and the oxidative coupling of thiols. The structure of the nanomagnetic catalyst was comprehensively characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy
固定在Fe 3 O 4-二亚乙基三胺上的Cu(II)被设计为一种新型,廉价且有效的非均相催化剂,用于合成2,3-二氢喹唑啉-4(1 H)-与硫醇的氧化偶联。使用傅里叶变换红外光谱,扫描电子显微镜,能量色散X射线光谱,振动样品磁力分析,热重分析,X射线衍射和原子吸收光谱对纳米磁性催化剂的结构进行了全面表征。用可商购的材料简单地制备催化剂,高催化活性,简单操作,高收率,使用绿色溶剂,易磁分离和具有不变活性的催化剂可重复使用性使我们的方案成为一种绿色可行的合成策略。
A choline hydroxide catalyzed synthesis of 2,3-dihydroquinazolin-4(1H)-ones in an aqueous medium
作者:Pravin N. Borase、Pranila B. Thale、G. S. Shankarling
DOI:10.1039/c6ra15574j
日期:——
A simple, metal and ligand-free protocol for the synthesis of 2,3-dihydroquinazolin-4(1H)-onesderivatives using choline hydroxide (ChOH) as an effective catalyst in an aqueous medium has been developed. The good to...
Amberlyst A26 OH as a Recyclable Catalyst for Hydration of Nitriles and Water-Based Synthesis of 4(1H)-Quinazolinones from 2-Aminobenzonitrile and Carbonyl Compounds
作者:Fatemeh Tamaddon、Farzaneh Pouramini
DOI:10.1055/s-0033-1340986
日期:——
Selective hydration of nitriles to primaryamides as well the base-catalyzedsynthesis of 2-substituted 4(1H)-quinazolinones via reaction of 2-aminobenzonitrile with carbonyl compounds using macroporous Amberlyst A26 OH in H2O–EtOH is described. The latter reaction proceeds via tandem hydration of 2-aminobenzonitrile, condensation of the in situ generated 2-aminobenzamide with carbonyl compounds, and
“On-Water” Synthesis of Quinazolinones and Dihydroquinazolinones Starting from o-Bromobenzonitrile
作者:Zibin Liu、Li-Yan Zeng、Chao Li、Fubiao Yang、Fensheng Qiu、Shuwen Liu、Baomin Xi
DOI:10.3390/molecules23092325
日期:——
A versatile and practical “on-water” protocol was newly developed to synthesize quinazolinones using o-bromobenzonitrile as a novel starting material. Studies have found that air as well as water plays an important role in synthesis of quinazolinones. Further investigation indicated that dihydroquinazolinones can be prepared with this protocol under the protection of N2. The protocol can be extended
12-tungstophosphoric acid supported on silica gel (PW/SiO2) exhibits excellent activity in the synthesis of 2,3-dihydroquinazolin-4(1 H )-ones by cyclocondensation reaction of 2-aminobenzamide with carbonylcompounds in water under reflux conditions. The desired products have been obtained in short reaction times in high yields. Our method has been successfully applied for both aldehydes and ketones (aromatic and aliphatic)
硅胶上负载的12-钨磷酸(PW / SiO 2)在回流条件下通过2-氨基苯甲酰胺与羰基化合物在水中的环缩合反应,在合成2,3-二氢喹唑啉-4(1 H )-酮中显示出优异的活性。 。在短的反应时间内以高收率获得了所需的产物。我们的方法已成功应用于醛和酮(芳族和脂族)。与现有方法相比,该方法的主要优点是易于回收和可重复使用的催化剂,易于处理以及避免使用有害的有机溶剂。