2,3,8,9-Dibenzo-5,6-(substituted)benzo-1,4-dithio-7-azacyclonona-2,5,8-trienes. Synthesis and mechanistic study
作者:Kyongtae Kim、Man Nyoung Kim
DOI:10.1002/jhet.5570340101
日期:1997.1
5-(2-Acetamidoaryl)thianthreniumyl perchlorates reacted with potassium hydroxide in methanol at reflux giving 2,3,8,9-dibenzo-5,6-(substituted)benzo-1,4-dithio-7-azacyclonona-2,5,8-trienes 4 in 43 to 75% yields, whereas the reactions of the same compounds with sodium hydride in the absence or in the presence of dimethyl sulfate in refluxing tetrahydrofuran gave N-acetylated and N-methylated 4 in 68
5-(2-乙酰氨基芳基)噻吩基高氯酸盐与氢氧化钾在甲醇中回流反应,得到2,3,8,9-二苯并-5,6-(取代)苯并-1,4-二硫基-7-氮杂环酮-2,5 ,8-三烯4的产率为43-75%,而相同化合物与氢化钠在无硫酸盐存在下或在硫酸二甲酯存在下在回流的四氢呋喃中反应,则得到68-96 %的N-乙酰化和N-甲基化4。产率分别为27%至56%。产物形成的机理可以通过噻吩环的ipso位上酰胺离子10、12和14的亲核攻击来解释。这些反应可能涉及硫烷基自由基机理。