Gallium(III) triflate-catalyzed one-pot selective synthesis of 2,3-dihydroquinazolin-4(1H)-ones and quinazolin-4(3H)-ones
作者:Jiuxi Chen、Dengze Wu、Fei He、Miaochang Liu、Huayue Wu、Jinchang Ding、Weike Su
DOI:10.1016/j.tetlet.2008.03.127
日期:2008.6
A series of 2,3-dihydroquinazolin-4(1H)-ones and quinazolin-4(3H)-ones have been synthesized in good to excellent yields and high selectivity by one-pot reaction using isatoic anhydride, ammonium acetate (or amines), and aldehydes in ethanol or in DMSO under mild conditions, respectively. The reaction was efficiently promoted by 1 mol % Ga(OTf)3 and the catalyst could be recovered easily after the
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
Abstract An efficient protocol for the synthesis of 2,3-dihydroquinazolinone derivatives from substituted 2-aminobenzamides and carbonyl analog catalyzed by the natural-based 5,5’-indigodisulfonic acid has been developed with good to excellent yields. Compared to the reaction conditions reported before, the use of eco-friendly and recyclable catalysts and mild reaction conditions are the major advantages