Self-condensation of ethyl oxaloacetate, catalysed by base, affords ethyl 4,5-bisethoxycarbonyl-2,5-dihydro-3-hydroxy-2-oxo-5-furylacetate (Ia), whose structure is confirmed, and ethyl 5-carboxy-4-ethoxycarbonyl-2,5-dihydro-3-hydroxy-2-oxo-5-furylacetate (Va). The latter melts with decomposition giving after methylation, ethyl 4-ethoxycarbonyl-2,5-dihydro-3-methoxy-2-oxo-5-furylacetate (IVe).
W. Cocker, P. H. Ladwa, T. B. H. McMurry and M. S. Ntamila, J. Chem. Soc. C, 1971, 1708 DOI: 10.1039/J39710001708
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