Derivatives of 5-Oxy-pyrido[2,3-<i>b</i>]quinoxaline-9-carboxylic acid: A tricyclic system useful for the synthesis of potential intercalators
作者:Athanasia Varvaresou、Kriton Iakovou
DOI:10.1002/jhet.5570390610
日期:2002.11
o-anthranilic acid, ii) intramolecular cyclization of the acid 1 to 5-oxy-pyrido[2,3-b]quinoxaline-9-carboxylic acid (2b) upon treatment with concentrated sulfuric acid and oleum and iii) conversion of the acid 2 to the desired amides 4a-i and 5. Compounds 4a-i and 5 are oxygenated azaanalogs of phenazines, a wellknown series of intercalators with cytotoxic activity.
一系列新的5-氧-吡啶并[2,3- b ]喹喔啉-9-羧酰胺4a-i和N 1,N 2-双(5-氧-吡啶并[2,3- b ]喹喔啉-据报道从2-氯-3-硝基吡喃二胺开始有9-苯甲酰基)乙二胺(5)。合成途径的基本步骤是:i)通过2-氯-3-硝基吡啶与邻氨基苯甲酸的铜催化缩合制备2-(3-硝基-吡啶-2-基氨基)苯甲酸(1); ii)酸1的分子内环化为5-氧-吡啶并[2,3 - b ]喹喔啉-9-羧酸(2b)用浓硫酸和发烟硫酸处理后,iii)将酸2转化为所需的酰胺4a-i和5。化合物4a-i和5是吩嗪的氧化氮杂类似物,这是一种众所周知的具有细胞毒性活性的嵌入剂。