Unprecedented ‘ring transformation-rearrangement’ of pyran-2-ones into 5,6-dihydropyran-2-ones through insertion of acetol

One-pot efficient synthesis of functionalized 5,6-dihydropyran-2-ones has been delineated by reacting 2H-pyran-2-ones and acetol in the presence of a base at room temperature. The formation of 5,6-dihydropyran-2-ones revealed that the reaction proceeded in a unique ‘ring transformation-rearrangement’ sequence.

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