Synthesis of New Pyrido[2′,3′:3,4]pyrazolo[1,5-<i>a</i>]pyrimidines and Their Use in the Preparation of Tetraheterocyclic Systems
作者:Farag A. El-Essawy
DOI:10.1080/00397910903020783
日期:2010.2.26
phenyl)-4-hydroxypyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-ones and 3-(2-hydroxyethyl)-2,8,10-trimethylpyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-ol were synthesized by cyclocondensation of 3-amine-4,6-dimethyl-1H-pyrazolo[3,4-b]pyridine with ethyl malonates and α-acetyl-γ-butyrlolactone. Dichloro- and diazido- derivatives were obtained from the reaction of pyridopyrazlopyrimidine derivatives with POCl3
8,10-二甲基-3-(未取代、甲基、乙基、正丁基、苯基)-4-羟基吡啶并[2',3':3,4]吡唑并[1,5-a]嘧啶-2(1H) 3-胺环缩合合成了-ones和3-(2-羟乙基)-2,8,10-三甲基吡啶并[2',3':3,4]吡唑并[1,5-a]嘧啶-4-醇-4,6-二甲基-1H-吡唑并[3,4-b]吡啶与丙二酸乙酯和α-乙酰基-γ-丁内酯。二氯和二叠氮基衍生物是从吡啶并吡唑并嘧啶衍生物与 POCl3 和 NaN3 的反应中获得的。四杂环体系是通过 4-氯-3-(2-氯乙基)-2,8,10-三甲基吡啶并[2',3':3,4]吡唑并[1,5-a]嘧啶与适当的环化反应形成的伯胺。所有化合物的结构均通过核磁共振和质谱确定。