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