Synthesis of new 5-aza-isosteres of guanine containing aryl and hetaryl substituents on the 1,2,4-triazole ring
作者:Anna V. Zavodskaya、Vladimir V. Bakharev、Victor E. Parfenov、Alexander A. Gidaspov、Pavel A. Slepukhin、Maksim L. Isenov、Oleg S. Eltsov
DOI:10.1016/j.tetlet.2015.01.151
日期:2015.2
The oxidative cyclization of 4-amino-substituted 6-arylidene(hetarylmethylidene)hydrazinyl-1,3,5-triazin-2-ones with lead(IV) tetraacetate proceeds via a Dimroth-type rearrangement to give 5-amino-substituted 2-aryl(hetaryl)-1,2,4-triazolo[1,5-a]-1,3,5-triazin-7-ones. IR, NMR, and X-ray studies have shown that the only products of the reactions were the [1,5-a]-isomers.
4-氨基取代的6-亚芳基(杂芳基亚甲基)肼基-1,3,5-三嗪-2-酮与四乙酸铅(IV)的氧化环化通过Dimroth型重排进行,得到5-氨基取代的2-芳基(杂芳基)-1,2,4-三唑并[1,5 - a ] -1,3,5-三嗪-7-。IR,NMR和X射线研究表明,反应的唯一产物是[1,5- a ]-异构体。