Synthesis of novel pyrindine derivatives from a facile reaction of 2,5-bisarylidenecyclopentanone and malononitrile

Starting from 2,5-bisarylidenecyclopentanone and malononitrile (1:1) several novel pyrindine derivatives were synthesized by a facile and convenient one-pot reaction using sodium ethoxide in absolute ethanol at room temperature. The structure of the reaction products was unambiguously deduced ftom their infrared, ¹H-nuclear magnetic resonance spectroscopy, elemental analysis and single crystal X-ray crystallography.