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。
Efficient one-pot synthesis of 2,3-dihydroquinazoline-4(1H)-ones promoted by FeCl3/neutral Al2O3
2,3-Dihydroquinazolin-4(1H)-one derivatives have been synthesized via one-pot reaction of isatoic anhydride, aromatic aldehyde, and ammonium acetate catalyzed by FeCl3/neutral Al2O3 in tert-butanol under reflux conditions. Inexpensive and easily available reagents, convenient work-up procedure, reusable catalyst, and moderate to good yield are the salient features of this protocol.
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...
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。
Expeditious synthesis of 2,3-dihydroquinazolin-4(1<i>H</i>)-ones in aqueous medium using thiamine hydrochloride (VB<sub>1</sub>) as a mild, efficient, and reusable organocatalyst
ABSTRACT A simple and straightforward synthesis of 2,3-dihydroquinazolin-4(1H)-ones is developed by reacting anthranilamide with various aldehydes or ketones under mild reaction conditions, using thiamine hydrochloride as a cost-effective, readily available, and green catalyst in water. Simple purification process, high yields within short reaction time, wide substrate scope, operational simplicity