A Facile One-Pot Synthesis of 3-Imidazolyl 1,2,4-Triazoles and 1,2,4-Oxadiazolones
作者:Alice Dias、Isabel Cabral、A. Vila-Chã、Daniela Cunha、Nádia Senhorães、Sandra Nobre、Cristina Sousa、M. Proença
DOI:10.1055/s-0030-1258820
日期:2010.11
5-(5-Aminoimidazol-4-yl)-1,2,4-triazol-3-ones were obtained under mild experimental conditions from 5-amino-4-(N-ethoxycarbonyl) cyanoformimidoyl imidazoles and hydrazine in a rapid one-pot reaction. When hydroxylamine hydrochloride was used, in the presence of base, the corresponding 1,2,4-oxadiazol-5-ones were isolated. An equally fast reaction occurred when 5-amino-4-(N-acetyl/benzoyl) cyanoformimidoyl imidazoles were combined with hydrazine to give 5-(5-aminoimidazol-4-yl)-1,2,4-triazoles.
在温和的实验条件下,5-(5-氨基咪唑-4-基)-1,2,4-三氮唑-3-酮是通过5-氨基-4-(N-乙氧基碳酰基)氰乙酰亚胺咪唑和肼在快速的一锅反应中获得的。当使用氢氧化铵盐时,在碱的存在下,分离出了相应的1,2,4-噁二唑-5-酮。当5-氨基-4-(N-乙酰/苯甲酰)氰乙酰亚胺咪唑与肼结合时,也发生了同样快速的反应,生成5-(5-氨基咪唑-4-基)-1,2,4-三氮唑。