蓝色OLED仍然是当今光电化学的挑战。第三代OLED基于热激活延迟荧光(TADF)。合成了一系列具有潜在TADF行为的杂多铱(III)咪唑并[1,5- a ]吡啶和-喹啉配合物,并通过UV-Vis吸收和荧光光谱以及激发态寿命的测量对其进行了表征。通过对第一激发单重态和三重态的相对能量进行计算计算,证实了实验结果。此外,HOMO和LUMO水平用DFT计算,并与根据循环伏安法确定的氧化还原电势估计的值进行比较。首次证明了这些化合物的TADF机理。
A copper(II)-catalyzed tandem reaction between pyridine ketone and benzylamine was developed by using clean O2 as an oxidant. This transformation proceeded via an efficient condensation–amination–oxidative dehydrogenation process, affording 1,3-diarylated imidazo[1,5-a]pyridines in excellent yields.
通过使用纯净的O 2作为氧化剂,进行了吡啶酮和苄胺之间的铜(II)催化串联反应。该转化过程通过有效的缩合-胺化-氧化脱氢过程进行,从而以优异的收率得到了1,3-二芳基咪唑并[1,5- a ]吡啶。
Synthesis of imidazo[1,5-<i>a</i>]pyridines <i>via</i> I<sub>2</sub>-mediated sp<sup>3</sup> C–H amination
A transition-metal-free sp3 C–H amination reaction has been established for imidazo[1,5-a]pyridine synthesis employing molecular iodine from 2-pyridyl ketones and alkylamines. In the presence of sodium acetate (NaOAc), the I2-mediated oxidative annulations of readily available substrates produced a variety of imidazo[1,5-a]pyridinederivatives efficiently in a one-pot manner. The present synthetic
已经建立了一种无过渡金属的sp 3 C-H胺化反应,该反应可使用2-吡啶基酮和烷基胺中的分子碘来合成咪唑并[1,5- a ]吡啶。在乙酸钠(NaOAc)的存在下,易于获得的底物的I 2介导的氧化环化反应以一锅法高效产生了各种咪唑并[1,5- a ]吡啶衍生物。本合成方法操作上简单,并且可以以克为单位方便地进行。此外,在最佳反应条件下,一系列1-(2-吡啶基)咪唑并[1,5- a由相应的二-2-吡啶基酮和取代的苄胺可容易地以令人满意的产率制备]吡啶半胱氨酸蛋白酶抑制剂。
Solvent-free microwave-assisted synthesis of imidazo[1,5- <i>a</i>]pyridine and –quinoline derivatives
Abstract A quick and highly efficient microwave-assisted preparation of imidazopyridines and –quinolines is described, starting from the corresponding ketones and amines. The method requires no solvent and uses activated MnO2 as an oxidant. A mechanism for the cyclization is proposed and discussed. Graphical Abstract