Synthesis and fluorescence properties of substituted 7-aminocoumarin-3-carboxylate derivatives
作者:John E. T. Corrie、V. Ranjit N. Munasinghe、Wolfgang Rettig
DOI:10.1002/jhet.5570370608
日期:2000.11
boxamide derivatives 2 and 3, each containing a maleimide have been synthesized as potential fluorescent labeling reagents for thiol groups in proteins and their fluorescence properties have been determined. The 4-trifluoromethyl substituted compound 2 has a significantly greater Stokes shift than the comparable compound lacking this group, but both the new coumarins have low fluorescence quantum yields
已经合成了各自含有马来酰亚胺的4-三氟甲基或6-溴取代的7-二乙基氨基香豆素-3-羧酰胺衍生物2和3,作为蛋白质中硫醇基的潜在荧光标记试剂,并且已经确定了它们的荧光性质。4-三氟甲基取代的化合物2的Stokes位移比缺少该基团的同类化合物要大得多,但是两种新的香豆素的荧光量子产率均很低(low f)。当存在4-三氟甲基取代基时,3-羧酰胺非常不稳定地水解。7-二乙基氨基香豆素-3-羧酸乙酯17的溴化分别得到6-和8-溴衍生物18和19,以及还有8-溴-7-一乙基化合物20.φ ˚F后者的化合物比其二乙氨基类似物19的化合物大100倍。荧光寿命测量结果支持基于扭曲的分子内电荷转移(TICT)模型的解释,以解释ϕ f的这些大差异。