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A novel cinchona‐alkaloid‐derived organocatalyst has been developed to catalyze the asymmetric regioselective [3+2] cycloaddition of 3‐isothiocyanato oxindoles with dibenzylidene ketones. A series of spirooxindole enols could be obtained in high yields with good‐to‐excellent diastereo‐ and enantioselectivities.

chemistryopen

Enantioselective Synthesis of Spirooxindole Enols: Regioselective and Asymmetric [3+2] Cyclization of 3‐Isothiocyanato Oxindoles with Dibenzylidene Ketones