A DBU-catalyzed green synthesis of spiro-oxindoles with 100% atom economy has been developed under environmentally benign conditions. This highly efficient transformation could be explained by its superior carbon basicity combined with nucleophilicity of DBU compared to other bases.
L. Wang, D. Zhang, J. Li, G. Xu and J. Sun, RSC Adv., 2014, 4, 44193 DOI: 10.1039/C4RA08812C
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