The combination of isatin, barbituric acid, and cyclohexane‐1,3‐dione derivatives in the presence of alum (KAl(SO4)2·12H2O) as a catalyst for 15 min was found to be a suitable and efficient method for the synthesis of spiro[chromeno[2,3‐d]pyrimidine‐5,3′‐indoline]‐tetraones.
no[2,3-d]pyrimidine-5,3'-indoline]-tetraones in Ionic Liquid Media. -All products are purified by recrystallization. The applied catalyst can be recycled several times. -(MIRHOSSEINI MOGHADDAM, M.; BAZGIR, A.; MOHAMMAD MEHDI, A.; GHAREMANZADEH*, R.; Chin. J. Chem. 30 (2012) 3, 709-714, http://dx.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.