Efficient regioselective heterocyclisation leading to fluorescent fused pyrazine derivatives
作者:Katarzyna Ostrowska、Katarzyna Szymoniak、Magdalena Szczurek、Krzysztof Jamroży、Maria Rąpała-Kozik
DOI:10.1016/j.tet.2011.05.048
日期:2011.7
regioselective syntheses of substituted pyrrolo[2,3-b]quinoxaline, pyrido[2,3-b]pyrrolo[2,3-e]pyrazine, pyrido[2,3-b]pyrrolo[3,2-e]pyrazine and pyrido[3,4-b]pyrrolo[3,2-e]pyrazine are reported. Differential reactivity between two amino groups in ortho-diaminopyridine can be exploited to obtain new regio-defined unsymmetrical pyridopyrrolopyrazine derivatives. Weak electron-donating methyl or moderately electron-withdrawing
取代的吡咯并[2,3- b ]喹喔啉,吡啶并[2,3- b ]吡咯并[2,3- e ]吡嗪,吡啶并[2,3- b ]吡咯并[3,2- e ]吡嗪的区域选择性合成报道了吡啶并[3,4- b ]吡咯并[3,2- e ]吡嗪。可以利用邻二氨基吡啶中两个氨基之间的差异反应性来获得新的区域定义的不对称吡咯并吡咯并吡嗪衍生物。与芳族邻二胺连接的弱给电子甲基或中等吸电子羧基会降低区域选择性,从而获得不对称取代的吡咯并[2,3- b喹喔啉。给出了所得的1-烷基吡咯并吡咯并吡嗪和取代的吡咯并[2,3- b ]喹喔啉衍生物的荧光性质。