Polycyclic Aromatic <i>N</i>-Ethoxycarbonyl Thioamide <i>S</i>-Oxides and Their Triflic Acid Promoted Cyclization to Fluorescent Thiophene Imine-Fused Arenes
作者:Marzena Witalewska、Anna Wrona-Piotrowicz、Anna Makal、Janusz Zakrzewski
DOI:10.1021/acs.joc.7b02867
日期:2018.2.16
We present the synthesis of a series of polycyclic aromatic-N-ethoxycarbonylthioamide S-oxides and their triflic acid-promoted cyclization to thiophene imine-fused arenes having 2H-naphtho[1,8-bc]thiophen-2-imine, 3H-pyreno[10,1-bc]thiophen-3-imine, 4H-pyreno[1,10-bc]thiophen-4-imine, 3H-pyreno[10,1-bc]thiophen-3-imine, 4H-pyreno[1,10-bc]thiophen-3-imine, 3H-pyreno[10,1-bc]thiophen-3-imine, and 4H-peryleno[3
我们提出了一系列多环芳香族-N-乙氧基羰基硫酰胺S-氧化物的合成及其三氟甲磺酸促进环化成具有2 H-萘[1,8 - bc ]噻吩-2-亚胺,3 H的噻吩亚胺基稠合的芳烃-pyreno [10,1- bc ]噻吩-3-亚胺,4 H -pyreno [1,10- bc ]噻吩-4-亚胺,3 H -pyreno [10,1- bc ]噻吩-3-亚胺,4 H- pyreno [1,10- bc ]噻吩-3-亚胺,3 H - pyreno [10,1- bc ]噻吩-3-亚胺和4 H - peryleno [3,4- bc]噻吩-4-亚胺核心。拟议的反应机理涉及一种新型的亲电子硫物质,即质子化的亚氨基磺酸或亚氨基ino阳离子的中间体。这些物种可能攻击芳烃的周围或ipso位置,在某些情况下会导致区域异构产物。该反应可提供高产率的新型多环荧光团,其发射范围为500–606 nm,量子产率为0.025–0