Nucleophilic substitution with amines: dihydro-1,2,4,5-tetrazines are more useful precursors than 1,2,4,5-tetrazines
作者:Arnaud Cutivet、Emmanuel Leroy、Eric Pasquinet、Didier Poullain
DOI:10.1016/j.tetlet.2008.02.145
日期:2008.4
avoids the up-to-now required oxidation step but also lower reaction times and/or temperatures compared to usual protocols. The efficiency of the reaction was highlighted by a practical synthesis of 3,6-bis(methylamino)-1,2,4,5-tetrazine using aqueous methylamine. Other primary and secondary amines were also found to give disubstitution products when reacted with 3,6-bis(methylsulfanyl)-1,2,4,5-dihydrotetrazine
描述了直接从3,6-二取代-1,2-二氢-1,2,4,5-四嗪前体直接合成(二)烷基氨基取代的1,2,4,5-四嗪的一步法。一项比较研究表明,与常规方案相比,所描述的方法不仅避免了目前所需的氧化步骤,而且还缩短了反应时间和/或温度。通过使用甲胺水溶液实际合成3,6-双(甲基氨基)-1,2,4,5-四嗪突出了反应的效率。当与3,6-双(甲基硫烷基)-1,2,4,5-二氢四嗪反应时,还发现其他伯胺和仲胺会产生分解性产物。