Synthesis and Photophysical Properties of 5-<i>N</i>-Arylamino-4-methylthiazoles Obtained from Direct C–H Arylations and Buchwald–Hartwig Aminations of 4-Methylthiazole
作者:Toshiaki Murai、Kirara Yamaguchi、Teppei Hayano、Toshifumi Maruyama、Koji Kawai、Hayato Kawakami、Akira Yashita
DOI:10.1021/acs.organomet.7b00128
日期:2017.7.24
5-N-Arylamino-4-methylthiazoles were synthesized from commercially available 4-methylthiazole in three consecutive steps: (i) direct Pd-catalyzed C–H arylations of the thiazole, (ii) bromination, and (iii) Pd-catalyzed Buchwald–Hartwig aminations. The resulting thiazoles showed the longest-wavelength absorption maxima at 338–432 nm, and luminescence was observed at 455–726 nm, whereby the latter depends
5 N-芳氨基-4-甲基噻唑是通过三个连续步骤由市售的4-甲基噻唑合成的:(i)直接由Pd催化的噻唑的CH–H芳基化,(ii)溴化,和(iii)Pd催化的Buchwald–Hartwig胺化。所得噻唑在338–432 nm处显示出最长的波长吸收最大值,并在455–726 nm处观察到发光,其中后者主要取决于噻唑核心2位上的取代基。电子接受基团,特别是硝基的引入,引起荧光的显着红移。在2-位含有3,5-双(三氟甲基)苯基的噻唑在固态下显示出紫色至蓝色的发射。前沿分子轨道的能级和5- N的Kohn-Sham图-D芳基氨基-4-甲基噻唑是从理论上的B3LYP / 6-31 + G(d,p)的DFT计算中获得的。