Fluorogenic Sydnone-Modified Coumarins Switched-On by Copper-Free Click Chemistry
作者:Camille Favre、Frédéric Friscourt
DOI:10.1021/acs.orglett.8b01587
日期:2018.7.20
application of sydnone-modified coumarins, a novel class of fluorogenic clickable reagents, are reported. The sydnone moiety, a stable aromatic 1,3-dipole, efficiently quenched the fluorescence of coumarin, which could be restored, with a 132-fold enhancement, upon cycloadditions with cyclooctynes, thereby expanding the fluorogenic click toolbox. TD-DFT calculations suggest that the fluorescence quenching
报道了新的一类荧光可点击试剂sydnone-修饰的香豆素的合成,光物理特性和生化应用。sydnone部分(一种稳定的芳族1,3-偶极子)有效地淬灭了香豆素的荧光,在与环辛炔进行环加成反应后,香豆素的荧光可以恢复132倍,从而扩展了荧光点击工具箱。TD-DFT计算表明,sydnone修饰的香豆素的荧光猝灭很可能是由于存在能量低的非发射电荷分离状态。