The spirooxindole framework is a representative spirocyclic motif found in a wide range of natural products and biologically active compounds, and it has recently attracted significant attention as a key structural element in drug design due to its ri...
The spirooxindole framework is a representative spirocyclic motif found in a wide range of natural products and biologically active compounds, and it has recently attracted significant attention as a key structural element in drug design due to its rigid three-dimensional architecture and capacity for diverse functionalization.
In this study, we developed an efficient method for synthesizing spirooxindole-2-oxazolidinones through a [3+2]-cycloaddition reaction between N-alkoxy-4-oxo-acrylamides and isatins under mild, base-mediated conditions. Examination of 12 acrylamide derivatives and 8 isatin derivatives revealed generally satisfactory results, affording up to 74% yield with a 4:1 diastereomeric ratio.
In addition, the obtained compounds were shown to undergo various functional group transformations, demonstrating the synthetic utility of this reaction. We anticipate that this methodology may be further extended to asymmetric catalytic systems in future studies.