InBr3-catalyzed approach to synthesize 2,3-dihydroquinazolin-4(1H)-onederivatives (3a–3aa) has been developed. Notably, all the products were isolated by recrystallization and the reaction is accessible on a gram scale. Moreover, the reactions only require 10–60 min. All the synthesized compounds were evaluated for their in vitro anticanceractivity against four human cancer cell lines. GRAPHICAL ABSTRACT
A new electrostatically enhanced sulfuric acid as a strong Brønstedacidiccatalyst has been developed for multi-component reactions. A positively charged center in the catalyst electrostatically activates it for acid-catalyzed multi-component reactions and afforded desired products in short reaction time and near room temperature in EtOH as a green solvent.Graphical Abstract
Highly efficient synthesis of 2,3-dihydroquinazolin-4(1H)-ones catalyzed by heteropoly acids in water
作者:YingXiao Zong、Yan Zhao、WenCai Luo、Xing Hai Yu、Jun Ke Wang、Yi Pan
DOI:10.1016/j.cclet.2010.03.022
日期:2010.7
Abstract Heteropoly acids efficiently catalyzed the cyclocondensation reaction of anthranilamide with aldehydes in water at ambient temperature and afforded the corresponding 2,3-dihydro-4(1 H )-quinazolinones compounds in good to excellent yields. This method provides mild reaction conditions and clean reaction profiles, using a small quantity of catalyst and a simple workup procedure.
Thiamine hydrochloride (VB1) as an efficient promoter for the one-pot synthesis of 2,3-dihydroquinazolin-4(1H)-ones
作者:Yijia Chen、Weiguang Shan、Min Lei、Lihong Hu
DOI:10.1016/j.tetlet.2012.08.090
日期:2012.10
A facile, efficient, and environmentally friendly procedure for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones from isatoic anhydride, aldehyde, and ammonium acetate in the presence of thiamine hydrochloride (VB1) in EtOH is described. The protocol proves to be efficient and environmentally benign in terms of high yields, ease of recovery, and reusability of catalyst. (C) 2012 Elsevier Ltd. All rights reserved.