Zur acylierung von 5-aryl-tetrazolen; ein duplikationsverfahren zur darstellung von polyarylen
作者:J. Sauer、R. Huisgen、H.J. Sturm
DOI:10.1016/s0040-4020(01)93173-4
日期:1960.1
We have found that the thermolysis of 5-substituted-2-acyl-tetrazoles (I) at 60–110° leads to quantitative loss of nitrogen and formation of an N-acyl-nitrilimine (III) as a hypothetical intermediate. This immediately reacts via ring closure to form 1,3,4-oxadiazoles (IV) in excellent yields. By an elegant reaction series it is possible to form polyaryles with alternating phenyl and 1,3,4-oxadiazole
我们发现5-取代-2-酰基-四唑(I)在60–110°的温度下热解会导致氮的定量损失,并形成N-酰基-丁三胺(III)作为假设的中间体。这立即通过闭环反应以优异的产率形成1,3,4-恶二唑(IV)。通过优美的反应系列,通过使5-苯基四唑与对氰基-苯甲酰氯反复反应,然后用叠氮化锂处理,可以形成具有交替的苯基和1,3,4-恶二唑环的多芳基化合物。从对苯二甲腈开始,具有4个步骤的具有9个环的多芳基被合成。2,5-二取代的1,3,4-恶二唑体系的紫外线吸收非常类似于对二取代的苯基的吸收曲线。