One‐pot and three‐component synthesis of spiro[chromeno[2,3‐d] pyrimidine‐5,3′‐indoline]‐diones and spiro[chromeno[2,3‐c] pyrazole‐4,3′‐indoline]‐diones
1. Nanobiotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran;2. Department of Chemistry, Shahid Beheshti University, G.C. Tehran 1983963113, Iran