In search of potent inhibitors of cholinesterase enzymes and antioxidant agents, synthetic derivatives of dihydroquinazolin-4(1H)-one (1?38) were evaluated as potential anti-Alzheimer agents through in vitro acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibitions and radical (DPPH and ABTS) scavenging activities. The structure?activity relationship (SAR) was mainly based on the different substituents at the aryl part which showed a significant effect on the inhibitory potential of enzymes and radical scavenging activities. The kinetic studies of most active compounds showed a noncompetitive mode of inhibition for AChE and a competitive mode of inhibition for the BChE enzyme. Additionally, molecular modelling studies were carried out to investigate the possible binding interactions of quinazolinone derivatives with the active site of both enzymes.
In this article, glycerol was employed in a quest to develop an environmentally benign and sustainable synthetic protocol for synthesis of quinazolinone and spiro-quinazolinone derivatives. These studies were performed to investigate the effect of electron-rich and electronegative groups on the synthetic route of an established protocol. Different substituted isatin and benzaldehyde derivatives have been incorporated to synthesize analogues of two series of quinazolinones in order to investigate the efficacy of the developed methodology and substrate tolerance. A total of 12 derivatives were synthesized and characterized by spectroscopic techniques.