Treatment of 4-methoxy-α-pyrones with butyllithium or lithium di-isopropylamide causes rapid deprotonation at C(3) of the pyrone ring to give moderately stable vinylic carbanions.
T. A. Carpenter, P. J. Jenner, F. J. Leeper and J. Staunton, J. Chem. Soc., Chem. Commun., 1980, 1227 DOI: 10.1039/C39800001227
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