Synthesis and reactions of some new spiro{indeno[1,2-b]pyran-4,3'-indolines}.

[摘要]：Indan-1,3-dione reacted with 3-dicyanomethylidene-2-oxoindolines in refluxed ethanol to afford 2-amino-3-cyanospiro {5H-indeno[1,2-b]pyrane-4,3'-(1'-substitutedindoline)}-2',5-diones (I, R = H, Me, Et). These compds. underwent different reactions to afford spiro {indeno[2',1':5,6] pyrano[2,3-d]pyrimidine-5,3'-(1'-substitutedindoline)} derivs., e.g., II, which are analogs of some reported biol. active spiropolycyclic compds.

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