Simple and Efficient Route to Synthesis of FunctionalizedSpiro[chromeno[2,3-d]pyrimidine-5,3ʹʹ-indoline]-tetraones by K-10 as a Reusable Catalyst

The reaction of isatin, barbituric acid, and cyclohexane-1,3-dione derivatives in the presence of K-10 as catalyst for 30 min was found to be a suitable and efficient method for the synthesis of spiro[chromeno[2,3-d]pyrimidine-5,3ʹ-indoline]-tetraones. This combination was done under ionic liquid media.