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A highly chemoselective one‐pot reaction has been developed involving a tandem semipinacol rearrangement/oxa‐Michael addition sequence in which the in situ generated ketol diene intermediate can be transformed specifically to either the spiro‐ or fused‐dihydrofuran products (see scheme). This one‐pot tandem reaction represents a general synthetic methodology for the syntheses of the two different...
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