Synthesis and peripheral substituent effects of bay-annulated indigo derivatives
作者:Taniyuki Furuyama、Daichi Tamura、Hajime Maeda、Masahito Segi
DOI:10.1016/j.tetlet.2018.06.036
日期:2018.7
study, indolo-naphthyridine-6,13-diones (5a–d) with four different peripheral substituents were prepared via bay-annulation reactions of indigo. The resulting compounds (5a–d) exhibited fluorescence in the red to near-IR region, while the parent indigo molecule showed no fluorescence. Although the peripheral substituents were oriented to the exterior of the π-conjugated system, the electronic structure