1,2,4-Triazole-Fused Heterocycles; Part 1: Preparation of 5,10-Dihydro-[1,2,4]-triazolo[5,1-<i>b</i>]quinazolines
作者:Kee-Jung Lee、Seong Heon Kim、Sanghee Kim、Hokoon Park、Yang Rai Cho、Bong Young Chung、Edward E. Schweizer
DOI:10.1055/s-1994-25637
日期:——
The reaction of benzophenone 1-ureidoethylidenehydrazones 9 with a mixture of triphenylphosphine, carbon tetrachloride, and triethylamine in dichloromethane provides a general route to 5,10-dihydro-[1,2,4]triazolo [5,1-b]quinazolines 7 via the electrocyclization of the expected azino carbodiimide intermediates 10. When one of the substituents on the ureas 9 was an aryl group, unusual guanidine compounds 13 were also produced, and their structures were confirmed by X-ray crystallographic analysis.
在二氯甲烷中,二苯甲酮 1-脲基亚乙基肼 9 与三苯基膦、四氯化碳和三乙胺的混合物发生反应,通过预期的叠氮碳二亚胺中间体 10 的电环化,提供了一条通向 5,10-[1,2,4]triazolo [5,1-b]quinazolines 7 的一般路线。当脲醛 9 上的一个取代基为芳基时,还产生了不常见的胍类化合物 13,并通过 X 射线晶体分析证实了它们的结构。