2-Methylimidazole (1) reacted with 3-dicyanomethylidine-1-ethyl-2-oxoindoline (2) in ethyl acetate to afford 5-amino-6-cyano-7,8-dihydro-1'-ethylspiro{imidazo[1,2-a]pyridine-7,3'-indolin}-2'-one (8), which used as a key intermediate for the synthesis of fused spiroheterocyclic derivatives of imidazo- pyridopyrimidine and/or imidazonaphthyridine nucleus incorporated indoline moiety. The chemical structures of all synthesized compounds were elucidated by the elemental and spectroscopic analyses.