作者:Jason C. Morris、John C. McMurtrie、Steven E. Bottle、Kathryn E. Fairfull-Smith
DOI:10.1021/jo200613r
日期:2011.6.17
Novel profluorescent nitroxides bearing a triazole linker between the coumarin fluorophore and an isoindoline nitroxide were prepared in good yields using the copper-catalyzed azide–alkyne 1,3-dipolar cycloaddition reaction (CuAAC). Nitroxides containing 7-hydroxy and 7-diethylamino substitution on their coumarin rings displayed significant fluorescence suppression, and upon reaction with methyl radicals
使用铜催化的叠氮化物-炔烃1,3-偶极环加成反应(CuAAC),可以高收率制备出在香豆素荧光团和异吲哚啉氮氧化物之间带有三唑连接基的新型前荧光氮氧化物。在香豆素环上含有7-羟基和7-二乙基氨基取代基的一氧化氮具有明显的荧光抑制作用,与甲基自由基反应后,荧光恢复正常。发现7-羟基香豆素氮氧化物及其反磁性类似物的荧光发射受pH的强烈影响,在碱性溶液中实现了最大的荧光发射。还显示出溶剂极性会影响荧光发射。