Condensation of the carbanion derived from methyl (E)-3-methoxy-2-methylprop-2-enoate with aldehydes provides a one step synthesis of 4-substituted methyl 2-methyltetronates, which are transformed into the free acids and 4-alkylidene derivatives.
T. Yamada, H. Hagiwara and H. Uda, J. Chem. Soc., Chem. Commun., 1980, 838 DOI: 10.1039/C39800000838
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