Studies in azide chemistry. Part V. Synthesis of 4-azido-2,3,5,6-tetrafluoro-, 4-azido-3-chloro-2,5,6-trifluoro-, and 4-azido-3,5-dichloro-2,6-difluoro-pyridine, and some thermal reactions of the tetrafluoro-compound
作者:R. E. Banks、G. R. Sparkes
DOI:10.1039/p19720002964
日期:——
6-tetrafluoropyridine and 4-amino-2,3,5,6-tetrafluoropyridine. Thermal decomposition of the azide in a mixture of cyclo-hexane, -heptane, and -octane reveals that C–H ‘insertion’ is encouraged by increase in ring size, and thermolysis experiments with cis- and trans-1,2-dimethylcyclohexane show that this type of reaction lacks stereospecificity. The results of reactions between the azide and trans-4-methylpent-2-ene
4-Azido-2,3,5,6-四氟吡啶可以通过2,3,5,6-四氟-4-肼基吡啶的亚硝化反应制备,也可以通过用叠氮化钠在乙腈中处理五氟吡啶(一种可转化3的试剂)来制备。 -氯-2,4,5,6-四氟-和3,5-二氯-2,4,6-三氟吡啶成4-叠氮基-3-氯-2,5,6-三氟-和4-叠氮基-3,5-二氯-2,6-二氟吡啶。4-叠氮基2,3,5,6-四氟吡啶在高于约200 ℃的温度下会平稳分解为氮和难处理的固体。130°C,在室温下与三苯基膦进行Staudinger反应,在高温下与二甲亚砜反应生成亚磺酰亚胺,与苯炔,二苯乙炔,苯乙炔,环戊二烯二聚体和降冰片烯参与1,3-偶极环加成反应,在175°C时与苯生成4-苯胺基-2,3,5,6-四氟吡啶,并与环己烷反应,生成CH–H'插入'产物4-(环己基氨基)-2,3,5,6-四氟吡啶和4-氨基-2,3,5,6-四氟吡啶。在环己烷,-庚烷和-辛烷的混合