The catalyst-free syntheses of pyrazolo[3,4-b]quinolin-5-one and pyrazolo[4′,3′:5,6]pyrido[2,3-d]pyrimidin-5,7-dione derivatives by one-pot, three-component reactions
作者:Mahnaz Ezzati、Jabbar Khalafy、Ahmad Poursattar Marjani、Rolf H. Prager
DOI:10.1016/j.tet.2017.10.004
日期:2017.11
Herein we report the syntheses of pyrazolo[3,4-b]quinolin-5-one and pyrazolo[4′,3′:5,6]pyrido[2,3-d]pyrimidin-5,7-dione derivatives by cyclocondensation of 1,3-diketones, 3-methyl-1-phenyl-1H-pyrazole-5-amine and arylglyoxals, under catalyst-free conditions in H2O/EtOH at reflux in 65–98% and 73–96% yields respectively. This protocol provides mild reaction conditions, good to high yields, non-catalytic
在本文中,我们报告了通过环缩合反应合成吡唑并[3,4- b ]喹啉-5-酮和吡唑并[4',3':5,6]吡啶[2,3 - d ]嘧啶-5,7-二酮衍生物。在无催化剂条件下于H 2 O / EtOH中回流下的1,3-二酮,3-甲基-1-苯基-1 H-吡唑-5-胺和芳基乙二醛的产率为65–98%和73–96%分别。该方案提供了温和的反应条件,良好的高收率,非催化的,简单的操作以及易于将产物分离为结构上不同的三环吡唑并[3,4- b ]喹啉-5-酮和吡唑并[4',3':5 ,6] pyrido [2,3 - d ] pyrimidin-5,7-dione衍生物,可能具有生物学和药理活性。