A new regiospecific synthesis method of 1 H -pyrazolo[3,4- b ]quinoxalines – Potential materials for organic optoelectronic devices, and a revision of an old scheme
作者:Andrzej Danel、Katarzyna Wojtasik、Paweł Szlachcic、Marlena Gryl、Katarzyna Stadnicka
DOI:10.1016/j.tet.2017.06.061
日期:2017.8
using a new synthetic pathway: reductive cyclization of appropriate 5-(o-nitrophenyl)-pyrazoles with ferrous oxalate or triphenylphosphine. The main advantage of this procedure is that, contrary to the older protocols of pyrazolo[3,4-b]quinoxaline synthesis, this method allows for a substituent to be introduced to the carbocyclic ring without the formation of isomers. The pyrazole ring can also be modified
使用一种新的合成途径制备了一系列6-取代的1,3-二苯基-1H-吡唑并[3,4- b ]喹喔啉:将适当的5-(邻硝基苯基)-吡唑与草酸亚铁或三苯基膦。该方法的主要优点是,与吡唑并[3,4- b ]喹喔啉合成的旧方案相反,该方法允许将取代基引入碳环而不形成异构体。吡唑环也可以进行一定程度的修饰。此外,我们提出了一种新的机制,据报道,邻苯二酚之间的缩合反应可用于最古老的吡唑并[3,4- b ]喹喔啉合成。-苯二胺和3,4-吡唑啉-5-二酮。