Approach to the Synthesis of 2,3-Disubstituted-3<i>H</i>-quinazolin-4-ones Mediated by Ph<sub>3</sub>P–I<sub>2</sub>
作者:Wong Phakhodee、Sirilak Wangngae、Mookda Pattarawarapan
DOI:10.1021/acs.joc.7b01322
日期:2017.8.4
Readily available N-substituted amides or their requisite carboxylic acids or acid chlorides have been used to construct 2,3-disubstituted-3H-quinazolin-4-ones in a one-pot procedure. Key transformation in this convergent approach involves Ph3P–I2-mediated formation of amidine upon condensation of an amide or the intermediate amide with methyl anthranilate. Cyclization of the amidine-tethered anthranilate
容易获得的N-取代的酰胺或其必需的羧酸或酰氯已被用于通过一锅法构建2,3-二取代的3 H-喹唑啉-4-酮。这种收敛方法的关键转化涉及在酰胺或中间体酰胺与邻氨基苯甲酸甲酯缩合后,由Ph 3 P–I 2介导的idine的形成。然后,在温和的条件下,将the系留的邻氨基苯甲酸酯环化,以良好至优异的产率得到2,3-二取代的3- H-喹唑啉-4-酮。