(3)—(10) undergo base-catalysed cyclization to give the 1,2,4-triazolo[4,3-b][1,2,4]triazoles (11)—(18). Sequential treatment of triazolo-triazoles (15)—(18) with methyl trifluoromethanesulphonate and triethylamine leads to the conjugated mesomeric betaines (23)—(26); on the other hand; sequential treatment of triazoles (7) and (10) with methyl trifluoromethanesulphonate and triethylamine leads to the
已经制备了许多
1,2,4-三唑并[4,3- b ] [1,2,4]三唑衍
生物。4-
氨基-2-甲基-5-甲
硫基-2- ħ -
1,2,4-三唑-3-(4 ħ) -酮(1)反应以diarylcarbodi -
酰亚胺,得到相应的4-(Ñ,Ñ ' -二芳基)
胍基-2-甲基-5-甲
硫基-2 H -
1,2,4-三唑-3(4 H)-ones(3)-(6)。2-甲基-5-甲基
硫代-4-三苯基
磷酰亚
氨基
氨基-2 H -
1,2,4-三唑-3(4 H)-
硫酮(2)与N,N'-二芳基
硫脲的反应生成相应的4- (N,N'-二芳基)
胍基-2-甲基-5-甲
硫基-2 H -
1,2,4-三唑-3(4 H)-
硫酮(7)–(10)。化合物(3)-(10)经历碱催化的环化,得到
1,2,4-三唑并[4,3- b ] [1,2,4]三唑(11)-(18)。用三
氟甲磺酸甲酯和
三乙胺依次处理三唑-三唑(15)-(18),得到共轭的美苏木
甜菜碱(23)-(26)。另一方面;