Alternative Routes to the Pyrazolo[4,3-e][1,2,4]triazolo-[1,5-c]pyrimidine System
作者:R. V. Tyurin、E. V. Vorob’ev、L. G. Minyaeva、V. V. Krasnikov、V. V. Mezheritskii
DOI:10.1007/s11178-005-0266-z
日期:2005.6
Formimidic acid esters derived from 1-substituted 5-aminopyrazole-4-carbonitriles reacted with carboxylic acid hydrazides on heating to give 2,7-disubstituted pyrazolo[4,3-e][1,2,4]triazolo[1,5-c]pyrimidine derivatives as a result of double heterocyclization. The same compounds were obtained by thermal recyclization of 1-aroyl-2-(1-R-pyrazolo[3,4-d]pyrimidin-4-yl)hydrazines.
由 1-取代的 5-氨基吡唑-4-甲腈衍生的甲酰亚胺酸酯与羧酸酰肼在加热条件下发生反应,经双杂环生成 2,7-二取代的吡唑并[4,3-e][1,2,4]三唑并[1,5-c]嘧啶衍生物。通过 1-芳酰基-2-(1-R-吡唑并[3,4-d]嘧啶-4-基)肼的热再化学反应也得到了相同的化合物。