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Discovery of the Nonenzymatic Formation of 3,3′-Spirooxindole γ‑Butyrolactones Enables One-Step Construction of the Core Skeleton
3,3′-Spirooxindole γ-butyrolactones are a small but intriguing family of natural products with diverse bioactivities and unique biosynthetic origins. Herein, we demonstrate that this core skeleton can form spontaneously via a nonenzymatic aldol condensation–lactonization cascade between 2-oxindole-3
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