The microwave‐assisted reductive cyclization reaction with the use of triphenylphosphine as a reducing agent in the synthesis of 1H‐pyrazolo[3,4‐b]quinoxaline derivatives was investigated. Contrary to the conventional method of conducting the reaction, the process in the reactor takes 25 minutes with moderate yields (30–38 %). This procedure was used to obtain three new 1,3‐dimethyl‐1H‐pyrazolo[3,4‐b]quinoxaline derivatives with substituents at position 6 of different donor‐acceptor character, which were used to determine the basic photophysical properties (UV‐Vis absorption spectra, fluorescence emission spectra) and the quantum yields of fluorescence were appointed. The measurement results indicate the possible use of new compounds as materials for OLEDs. The conducted research brings new knowledge in the field of 1H‐pyrazolo[3,4‐b]quinoxaline derivative systems and provides an alternative to conventional synthesis of pyrazoloquinoxalines.

中文翻译：

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区域特异性反应的修饰合成1H-吡唑并[3,4-b]喹喔啉衍生物-微波场的影响

以三苯基膦为还原剂，在微波辅助的还原环化反应中合成了1 H-吡唑并[3,4- b ]喹喔啉衍生物。与进行反应的常规方法相反，反应器中的过程耗时25分钟，产率中等（30-38％）。此程序用于获得三个新的1,3-二甲基-1 H-吡唑并[3,4- b在供体-受体特性不同的6位带有取代基的]喹喔啉衍生物用于确定基本的光物理性质（紫外-可见吸收光谱，荧光发射光谱），并确定了荧光的量子产率。测量结果表明，可能将新化合物用作OLED的材料。进行的研究为1 H-吡唑并[3,4- b ]喹喔啉衍生物系统领域带来了新的知识，并为吡唑并喹喔啉的常规合成方法提供了一种替代方法。