3,4-Dihydro-1H,6H-[1,4]oxazino[3,4-b]quinazolin-6-one 3 and its 1-methyl and 1-hydroxy derivatives 8 and 13 were prepared by different routes. The active methylene group of compound 3 was reacted with electro-hilic reagents (bromine, phenyldiazonium chloride, nitrous acid, a Vielsmeier-Haack reagent, aromatic aldehydes and diethyl oxalate) to yield 1-substituted-3,4-dihydro[1H,6H)-1,4-oxazino[3,4-
通过不同的途径制备了3,4-二
氢-1 H,6 H- [1,4]恶嗪基[3,4- b ]
喹唑啉-6-one 3及其
1-甲基和1-羟基衍
生物8和13。使化合物3的活性亚
甲基与电子-羟基试剂(
溴,
氯化
苯基重
氮,
亚硝酸,Vielsmeier-Haack试剂,芳族醛和
草酸二乙酯)反应,生成1-取代的3,4-二
氢[1 H, 6 H)-1,4-恶嗪基[3,4- b ]
喹唑啉-6-
酮。1-羟基和1-
溴衍
生物13和15的反应性在某些反应中也进行了调查。通过uv,1 H和13 C nmr光谱对3,4-二
氢-1 H,6 H- [1,4]恶嗪基[3,4- b ]
喹唑啉-6-进行了表征。