Activated Nitriles in Heterocyclic Synthesis: Novel Synthesis of Pyrrolo(1,2-c)imidazole and Pyrano(2,3-d)imidazole Derivatives.

Abstract Several new pyrrolo[1,2-ylidene ethyl cyanoacetate (lc, d) with each of (2) and (11) afforded the 5-ylidene-2-thiohydantoins (Sa, b), (Wn. b) respectively. Compounds Sn, b react with each of malononitrile and ethyl cyanoacet-ate to give the corresponding pyrroloimidazole derivatives (h,b) and (an, b) respectively. The structure of the isolated products were established by elemental analyse and spectral data studies.