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
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。
Copper-Catalyzed One-Pot Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones from 2-Nitrobenzonitriles and Carbonyl Compounds Mediated by Diboronic Acid in Methanol–Water
A copper-catalyzed one-potsynthesis of 2,3-dihydroquinazolin-4(1H)-ones with diboronic acid as a reductant in an aqueous medium is described. Various 2,3-dihydroquinazolin-4(1H)-ones were prepared with good functional-group tolerance in good yields under mild conditions from readily available 2-nitrobenzonitriles and various carbonyl compounds.
Gemini basic ionic liquid as bi-functional catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones at room temperature
作者:Apurba Dutta、Krishnaiah Damarla、Arvind Kumar、Prakash J. Saikia、Diganta Sarma
DOI:10.1016/j.tetlet.2019.151587
日期:2020.3
A cascade synthesis of 2,3-dihydroquinazolin-4(1H)-ones has been developed from 2-aminobenzonitriles and carbonyl analogues using Gemini basic ionicliquid as green catalyst cum solvent at roomtemperature. Both aldehydes and ketones were condensed with 2-aminobenzonitriles affording good to excellent yields of products. Moreover, the ionicliquids can be reused up to 5th cycle without significant