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.
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.
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.
Facile and efficient protocols for C–C and C–N bond formation reactions using a superparamagnetic palladium complex as reusable catalyst
作者:Mohammad Ali Karimi Zarchi、Seyed Shahab Addin Darbandizadeh Mohammad Abadi
DOI:10.1007/s11164-019-03754-y
日期:2019.5
Abstract Facile and efficient protocols for some multicomponent coupling reactions such as the Suzuki reaction and synthesis of polyhydroquinoline and 2,3-dihydroquinazoline-4-(1H)-one derivatives using a superparamagnetic palladium complex as catalyst have been developed. Graphical abstract
glycol) complex supported on magnetic nanoparticle was created by grafting. The catalytic activity of Fe3O4@PEG–Ni was explored through one‐pot green synthesis of 2,3‐dihydroquinazolin‐4(1H)‐ones and used as an efficient and recoverable nanocatalyst. FT‐IR, XRD, EDS, BET, TGA, VSM and SEM techniques were employed to specify the nanocatalyst. This heterogeneous nanocatalyst demonstrated acceptable recyclability
磁性纳米颗粒上负载的Ni-PEG(聚乙二醇)复合物是通过接枝产生的。Fe 3 O 4 @ PEG-Ni的催化活性是通过一锅法绿色合成2,3-二氢喹唑啉-4(1 H)-酮来探索的,并被用作有效和可回收的纳米催化剂。FT-IR,XRD,EDS,BET,TGA,VSM和SEM技术用于指定纳米催化剂。这种非均相纳米催化剂显示出可接受的可回收性,可以重复使用几次,而不会显着降低其催化活性。