Bisdihydroquinazolinones were synthesized for the first time by a novel pseudo five-component condensation of isatoic anhydride, a primary amine, and a dialdehyde in water. Several solvents were examined for this reaction; however, in terms of reaction yield and time, water was found to be the optimum solvent.
2,3-Dihydroquinazolin-4(1H)-ones were efficiently synthesised by the reaction of isatoic anhydride, a primary amine or ammonium acetate, and different aromatic aldehydes in 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF4) without using any acidic catalyst. Also a bis-derivative of the title compound as a polyheterocyclic system was synthesised successfully in high yield.
Efficient synthesis of mono- and disubstituted 2,3-dihydroquinazolin-4(1H)-ones using KAl(SO4)2·12H2O as a reusable catalyst in water and ethanol
作者:Minoo Dabiri、Peyman Salehi、Somayeh Otokesh、Mostafa Baghbanzadeh、Gholamreza Kozehgary、Ali A. Mohammadi
DOI:10.1016/j.tetlet.2005.06.157
日期:2005.9
KAI(SO4)(2)(.)l2H(2)O was found to catalyze efficiently a one-pot three-component cyclocondensation of isatoic anhydride and primary amines or ammonia sources such as (NH4)(2)CO3, NH4OAc and NH4Cl with aromatic aldehydes under mild conditions to afford the corresponding mono- and disubstituted 2,3-dihydroquinazolin-4(1H)-ones in good yields. (c) 2005 Elsevier Ltd. All rights reserved.
Expeditious One‐Pot and Solvent‐Free Synthesis of Dihydroquinazolin‐4(1H)‐ones in the Presence of Microwaves
作者:Mandar P. Surpur、Pankajkumar R. Singh、Sachin B. Patil、Shriniwas D. Samant
DOI:10.1080/00397910701354699
日期:2007.6
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.