[摘要]：3-dicyanomethylidine-1-ethyl-2-oxoindoline in Et acetate to afford 5-amino-6-cyano-7,8-dihydro-1'-ethylspiro{imidazo[1,2-a]pyridine-7,3'-i ndolin}-2'-one. This product was used as a key intermediate for synthesis of fused spiroheterocyclic derivs. of imidazopyridopyrimidine and/or imidazonaphthyridine nucleus incorporated indoline moiety, e. g. I. The chem. structures of all synthesized compds. were elucidated by the elemental and spectroscopic analyses.
