Synthesis and Cyclization of 2-Amino- and 2-Methyl-Substituted 1,3-Diaminobenzimidazolium Salts
作者:T. A. Kuz’menko、A. S. Morkovnik、L. N. Divaeva、G. S. Borodkin、V. V. Kuz’menko
DOI:10.1007/s10593-014-1627-8
日期:2015.2
N-Amination of 1-amino(alkylamino, benzylidenamino)-substituted 2-amino- and 2-methylbenzimid-azoles with O-picrylhydroxylamine gave the respective 1,2,3-triamino- and 1,3-diamino-2-methylbenz-imidazolium salts, which cyclized upon treatment with acetic anhydride/K2CO3 into previously unreported derivatives of N-amino[1, 2, 4]triazolo[1,5-а]benzimidazoles and N-aminopyrazolo-[1,5-а]benzimidazoles.
用O-吡啶甲基羟胺对1-氨基(烷基氨基,亚苄基氨基)取代的2-氨基-和2-甲基苯并咪唑进行N-氨基化反应,分别得到1,2,3-三氨基和1,3-二氨基-2-甲基苯并-咪唑鎓盐,经乙酸酐/ K 2 CO 3处理后环化成以前未报道的N-氨基[1,2,4]三唑[1,5-α]苯并咪唑和N-氨基吡唑并[[5,5-] ]苯并咪唑。形成的吡唑并[1,5-α]苯并咪唑类化合物中存在α-乙酰基取代基,是通过量子化学计算来解释的,这是由于中间体亚甲基碱而不是三环系统的酰化作用所致。