Synthesis and tautomeric structure of 6-arylhydrazono 1H-pyrazolo[3′,4′:4,5]pyrimido[1,6-b][1,2,4]triazepines
作者:Ahmad S. Shawali、Thoraya A. Farghaly
DOI:10.1016/j.tet.2008.11.018
日期:2009.1
A simple synthetic strategy is described for synthesis of the hitherto unreported 6-arylhydrazono-1,3-diphenyl-7-methyl-1H-pyrazolo[3′,4′:4,5]pyrimido[1,6-b][1,2,4]triazepin-5(6H)-ones 5a–j. The acid dissociation constants were determined for the series prepared and were correlated by the Hammett equation using the enhanced substituent constants. The results of such a correlation together with the
描述了一种简单的合成策略,用于合成迄今未报道的6-芳基肼基-1,3-二苯基-7-甲基-1 H-吡唑并[3',4':4,5]嘧啶[ 1,6- b ] [ 1,2,4] triazepin-5(6 H)-one 5a – j。确定所制备系列的酸解离常数,并使用增强的取代基常数通过Hammett方程进行关联。这种相关性的结果以及光谱数据表明,所研究的化合物主要以the互变异构形式存在。