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T. A. Carpenter, P. J. Jenner, F. J. Leeper and J. Staunton "A Novel Kinetic Deprotonation at a Vinylic Carbon in a Pyrone Ring" J. Chem. Soc., Chem. Commun.,1980, 1227.
Full Text
Treatment of 4-methoxy-a-pyrones with butyllithium
or lithium di-isopropylaniide causes rapid
deprotonation at C(3) of the pyrone ring to give nioderately
stable vinylic carbanions.