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.
A modified Friedländer conversion of the cyclocondensation of aromatic o‐aminonitriles with carbonyl compounds was discovered. Systematic studies reveal that both the new transformation and the classic Friedländer annulation in the presence of ZnCl2 constitute a pair of divergent reaction, and thecontrolled PDF transformation of this divergent reaction was achieved in the present of bases.
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