Synthesis of Polyfunctionalized 1,4-Dihydropyridine-Fused-1,3-Diazaheterocycles: One-Pot Reaction of 1,1-Bis(methylthio)-2-nitroethylene, 1,<i>n</i>-Diamine, Arylaldehyde, and Malononitrile
An efficient, one‐pot synthetic protocol for polyfunctionalized 1,4‐dihydropyridine‐fused‐1,3‐diazaheterocycles, a class of biologically active compounds, starting from 1,1‐bis(methylthio)‐2‐nitroethylene, 1,n‐diamine, arylaldehyde, and malononitrile is described. The reactions are completed within 12–15 h under refluxing conditions and in the presence of 10 mol % of piperidine as a basic catalyst