Synthesis of 2,4-Diaminoquinazolines and Tricyclic Quinazolines by Cascade Reductive Cyclization of Methyl <i>N</i>-Cyano-2-nitrobenzimidates
作者:Ping Yin、Nan Liu、Yu-Xing Deng、Yue Chen、Yong Deng、Ling He
DOI:10.1021/jo2023697
日期:2012.3.16
An efficient route to N4-substituted 2,4-diaminoquinazolines has been developed by employing tandem condensation of cyanoimidate–amine and reductive cyclization in iron–HCl system. This method is tolerant of a following intramolecular N-alkylation and produces two fused heterocycles in a one-pot procedure. This protocol is a facile two-step synthesis of tricyclic quinazolines, which is effected by
通过使用氰基亚氨酸酯-胺的串联缩合和铁-HCl体系中的还原环化,已开发出一种高效的N 4取代的2,4-二氨基喹唑啉路线。该方法耐受随后的分子内N-烷基化,并在一锅法中产生两个稠合的杂环。该协议是三环喹唑啉的两步合成方法,该方法可通过有效的氰基亚酰胺化作用和2-硝基苯甲醛的串联还原环化作用来实现。此外,已经从开环/闭环级联的角度研究了三环喹唑啉的形成过程。发现以高收率制备三环喹唑啉酮依赖于碱或酸体系中三环喹唑啉的选择性水解。