The Synthesis from 2.5-Dichloro-1.1.1.6.6,6-hexafluoro-3.4-diazahexa-2.4- diene of 4H-3.5-Bis(trifluoromethyl)-1.2,4-triazole and some 1- and 4-Substituted Derivatives
作者:Mohamad Abdul-Ghani、Anthony Edgar Tipping
DOI:10.1016/s0022-1139(00)82610-x
日期:1990.6
respectively in high yield. Reaction of the 4H-1,2,4-triazole (1a) with ethyl propynoate and of its sodium salt (6b) with ethyl bromoethanoate and pentafluoropyridine yield the acrylate (7a)-, carboethoxymethyl (7b)- and fluoropyridyl (9–11)- derivatives of 1H-3,5-bis(trifluoromethyl)-1,2,4-triazole with competing attack on the pentafluoropyridine ring taking place at the 2- and 4- positions.
用过量的氨或甘氨酸乙酯处理标题嗪(3),得到相应的二氨基嗪(4a)和(4b),对其进行热环化,得到3,5-双(三氟甲基)1-2,4-三唑铵(6a) [可以通过水酸处理从中释放出母体4 H -1,2,4-三唑(1a) ]和4-羰基乙氧基甲基-3,5-双(三氟甲基)-1,2,4-三唑(1e),分别以高产。4 H -1,2,4-三唑(1a)与丙酸乙酯反应,其钠盐(6b)与溴乙酸乙酯和五氟吡啶反应,得到丙烯酸酯(7a) -,碳氧乙氧基甲基(7b) -和氟吡啶基(9-11) -1 H -3,5-双(三氟甲基)-1,2,4-三唑的衍生物在五氟吡啶环上发生竞争性进攻2位和4位。