An Efficient, Three-Component Synthesis of Spiro[benzo[g]chromene-4,3′-indoline]-3-carbonitrile and Spiro[indoline-3,5′-pyrano[2,3-d]pyrimidine]-6′-carbonitrile Derivatives

Spirol[benzol[g]chromene-4,3'-indoline]-3-carbonitriles and spiro[indoline-3,5'-pyranol[2,3-d]pyrimidine]-6'-carbonitriles were synthesized via a three-component reaction of isatins, 2-hydroxynaphthalene-1,4-dione or 2-methylpyrimidine-4,6-diol, and malononitrile in aqueous media.