The use of nuclear-chemical synthesis, based on the generation of free nucleogenic phenyl cations, allowed for the direct phenylation of the nitrogen atom in 1,4-diazines. The presence of two methyl substituents in the quinoxaline substrate leads to a marked increase of diazine salt radiochemical yield. On the basis of quantum-chemical calculations the possibility of synthesizing 2,3-dimethyl-1,4-di-phenylquinoxalinium dication is proposed.

Antifungal activity (Candida albicans, Candida krusei) of some substituted quinolinium derivatives has been investigated. It was established that the most perspective compound for detail investigation of antifungal activity by labeled biomarkers method was N-phenylbenzoquinaldinium tetrafluoroborate.