DIOP catalyzed highly enantioselective [3 + 2] annulation of N-protected isatins with but-3-yn-2-one has been disclosed, allowing the synthesis of enantioenriched spiro[furan-2,3′-indoline]-2′,4(5H)-dione in moderate yields along with good to high enantioselectivities under mild conditions.
Organic & Biomolecular Chemistry
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