在氯化铝存在下用苯胺处理的2-氨基苄腈分别得到2-氨基-N-芳基苯甲m。通过在甲酸中加热2-氨基-N-芳基苯甲m直接获得在2位上没有取代基的4-芳基氨基喹唑啉;在类似条件下,其他羧酸不与the反应。当用醛处理时,后者得到2-芳基-4-芳基氨基-1 H -2,3-二氢喹唑啉易于被高锰酸钾氧化成2-芳基-4-芳基氨基喹唑啉。
Rhodium(III)-catalyzed [4 + 2] annulation of N-arylbenzamidines with 1,4,2-dioxazol-5-ones: Easy access to 4-aminoquinazolines via highly selective C H bond activation
gave respective 2-amino-N-arylbenzamidines. 4-Arylaminoquinazolines lacking a substituent at the 2 position were obtained directly by heating 2-amino-N-arylbenzamidines in formic acid; in similar conditions other carboxylic acids did not react with the amidines. The latter when treated with aldehydes afforded 2-aryl-4-arylimino-1H-2,3-dihydroquinazolines readily oxidizable by potassium permanganate to
在氯化铝存在下用苯胺处理的2-氨基苄腈分别得到2-氨基-N-芳基苯甲m。通过在甲酸中加热2-氨基-N-芳基苯甲m直接获得在2位上没有取代基的4-芳基氨基喹唑啉;在类似条件下,其他羧酸不与the反应。当用醛处理时,后者得到2-芳基-4-芳基氨基-1 H -2,3-二氢喹唑啉易于被高锰酸钾氧化成2-芳基-4-芳基氨基喹唑啉。