ChemInform Abstract: peri-Substituted Imidazo(1,2-a)pyridines. A New Reductive Elimination Reaction.

ChemInform Abstract

Reductive elimination of (I) or (III) using hydrazine affords the imidazopyridines (II) or (IV). A variety of other 3-nitro-5-substituted imidazopyridines (V) is prepared, but these cannot be cyclized to the corresponding 1,2,4-triazacyclopentindenes. The 3-amino-5-methoxycarbonyl derivative (VI) cyclizes to the triazacyclopentindenone (VII).