Deep eutectic solvent mediated synthesis of quinazolinones and dihydroquinazolinones: synthesis of natural products and drugs
作者:Suman Kr Ghosh、Rajagopal Nagarajan
DOI:10.1039/c6ra00855k
日期:——
A mild and greener protocol was developed to synthesize substituted quinazolinones and dihydroquinazolinonesviadeep eutectic solvent mediated cyclization with aliphatic, aromatic, and heteroaromatic aldehydes in good to excellent yields.
A regioselective three-component reaction for synthesis of novel 1′H-spiro[isoindoline-1,2′-quinazoline]-3,4′(3′H)-dione derivatives
作者:Ali A. Mohammadi、M. Dabiri、H. Qaraat
DOI:10.1016/j.tet.2009.02.037
日期:2009.5
regioselective three-component reaction of isatoic anhydride, isatins, and aromatic or aliphatic primary amines in the presence of catalytic amount of KAl(SO4)2·12H2O (alum) to yield a novel series of 1′H-spiro[isoindoline-1,2′-quinazoline]-3,4′(3′H)-dione is described.
An efficient and convenient protocol for the synthesis of novel 1′H-spiro[isoindoline-1,2′-quinazoline]-3,4′(3′H)-dione derivatives
作者:M. Dabiri、Ali A. Mohammadi、Hassan Qaraat
DOI:10.1007/s00706-008-0040-3
日期:2009.4
AbstractAn efficient and direct procedure for the synthesis of novelspiro[isoindoline-1,2′-quinazoline]-3,4′(3′H)-dione derivatives is described. The process employs a condensation reaction of 2-aminobenzamides and isatins in the presence of a catalytic amount of KAl(SO4)2.12H2O (alum) in ethanol under reflux. Graphical Abstract
Phosphotungstic acid mediated, microwave assisted solvent-free green synthesis of highly functionalized 2ˈ-spiro and 2, 3-dihydro quinazolinone and 2-methylamino benzamide derivatives from aryl and heteroaryl 2-amino amides
The reaction afforded spiro-, cyclized quinazolinones and 2-amino substituted carboxamide derivatives within few minutes of irradiation in excellent yield. Plausible mechanism for the formation of products is provided. Synthetic utility of 1′H-spiro[fluorene-9,2′-quinazolin]-4′(3′H)-one 3a has been demonstrated by synthesis of 1,4-di(1′H-spiro[fluorene-9,2′-quinazolin]-4′(3′H)-one) buta-1,3-diyne 12,
β-Cyclodextrin Mediated Multicomponent Synthesis of
Spiroindole Derivatives in Aqueous Medium
作者:Vishwa Deepak Tripathi
DOI:10.14233/ajchem.2020.22311
日期:2020.1.15
An efficient β-cyclodextrin catalyzed multicomponent synthetic protocol has been developed for the synthesis of spiro[indoline-3,2'-quinazoline]-2,4'(3’H)-dione from isatoic anhydride, isatin and primary amine in aqueous medium. This methodology offers a convenient method for the synthesis of spiroindole quinazolines in excellent yields. To extend synthetic utility of protocol some dihydro quinazolines