Metal-Free Oxidative C(sp3)–N Coupling by HBr and DMSO: A Novel Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones
作者:Parviz Ranjbar、Narjes Rezaei、Ehsan Sheikhi
DOI:10.1055/s-0036-1591544
日期:2018.4
A metal-free oxidative C(sp3)–N coupling process has been developed for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones. The reaction between primary amines, isatoic anhydride, and benzylic alcohols in the presence of HBr in DMSO at 80 °C affords 2,3-dihydroquinazolin-4(1H)-ones in excellent yields. Under these reaction conditions, benzylic alcohols react with in situ generated bromodimethylsulfonium
An Efficient One-Pot Synthesis of 2,3-dihydroquinazolin-4(1H)-ones in Green Media
作者:Mohammad Ali Bodaghi Fard、Akbar Mobinikhaledi、Mahdia Hamidinasab
DOI:10.1080/15533174.2013.776605
日期:2014.4.21
A series of mono- and disubstituted 2,3-dihydroquinazoline-4(1H)-ones have been synthesized in good yields by one-pot reaction using isatoic anhydride, ammonium acetate or amines and aldehydes in green and mild reaction conditions. The effects of various parameters such as the solvent, catalyst amount, reaction time, and temperature were examined. The protocol is simple, efficient, and environmentally benign and the catalyst can be recovered and reused without evident loss of reactivity.