Synthesis, structural investigations, and DFT calculations on novel 3-(1,3-dioxan-2-yl)-10-methyl-10H-phenothiazine derivatives with fluorescence properties
作者:Luiza Găină、Emese Gal、Larisa Mătărângă-Popa、Dan Porumb、Alina Nicolescu、Castelia Cristea、Luminita Silaghi-Dumitrescu
DOI:10.1016/j.tet.2012.01.068
日期:2012.3
with molecular mechanics and semi-empirical DFT calculations, which supported an anancomeric chair conformation of the 1,3-dioxane ring with the phenothiazine substituent in the equatorial position and possible free rotation about the single bond linking the two heterocyclic units. The new compounds display daylight fluorescence characterized by remarkably large Stokes shifts determined by LE spectroscopy
在常规条件下,微波辅助条件下和标准有机溶剂条件下,水为条件下,进行了10-甲基-10 H-吩噻嗪-甲醛与1,3-丙二醇或2-取代-1,3-丙二醇缩醛化的比较研究,方法如下:尝试向环境友好的合成方法发展。新的3-(1,3-二恶烷-2-基)-10-甲基-10 H-吩噻嗪衍生物是通过水的共沸蒸馏以高收率得到的,而通过在过热条件下在包括水在内的不同溶剂中通过微波辅助合成以中等收率得到的。根据DFT计算,假定溶剂对稳定缩醛化机理中涉及的关键中间体有影响,这表明在水溶剂中具有良好的焓分布。基于光谱方法(NMR,FT-IR,UV-vis和MS)的新化合物的结构研究已通过分子力学和半经验DFT计算完成,这支持了1,3-二恶烷的anancomeric椅构象。环与吩噻嗪取代基在赤道位置,并可能围绕连接两个杂环单元的单键自由旋转。