Functionalization of Quinazolin-4-ones Part 1: Synthesis of Novel 7-Substituted-2-thioxo Quinazolin-4-ones from 4-Substituted-2-Aminobenzoic Acids and PPh<sub>3</sub>(SCN)<sub>2</sub>
作者:Jacob Heppell、Jasim Al-Rawi
DOI:10.1002/jhet.1669
日期:2014.1
acetylamino)‐2‐aminobenzoic acid were allowed to react with PPh3(SCN)2 and gave the crossholding 7‐nitro, 7‐acetylamino‐ and 7‐amino‐2‐thioxo quinazolin‐4‐ones respectively. The nature of the substituent at position 4 of the 2‐aminobenzoic acids has significant influence on the outcome of the cyclisation reaction with PPh3(SCN)2. Similarly, the nature of the substituent at position 7 of the 2‐substituted
允许4-(硝基,氨基,乙酰氨基)-2-氨基苯甲酸与PPh 3(SCN)2反应并生成交联的7-硝基,7-乙酰氨基和7-氨基-2-硫代喹唑啉-4-酮分别。2-氨基苯甲酸第4位的取代基的性质对与PPh 3(SCN)2的环化反应的结果有重大影响。同样,在2-取代的喹唑啉-4-酮的7位上的取代基的性质显着影响了烷基化反应的难易程度。发现7-取代2-巯基喹唑啉-4-酮的烷基化选择性取决于卤代烷的性质和2位取代基的性质。