Nitrogen bridgehead compounds. Part<b>85</b>. Synthesis and reactivity of 3,4-dihydro-1<i>H</i>,6<i>H</i>[1,4]oxazino[3,4-<i>b</i>]quinazolin-6-ones
作者:István Hermecz、Ildikó Szilágyi、László Orfi、József Kökösi、György Szász
DOI:10.1002/jhet.5570300539
日期:1993.10
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。