Heating tetra-alkoxyethenes with α-oxo-nitriles leads to cycloaddition products, viz. 3,3,4,4-tetra-alkoxyoxetan-2-carbonitriles (16), which can be converted into 2,2-dialkoxy-3-cyano-3-hydroxy-carboxylic esters (17) by acetolysis, and subsequently into α-acyl-αα-dialkoxyacetates (18) by treatment with alkali.
P. H. J. Ooms, H. W. Scheeren and R. J. F. Nivard, J. Chem. Soc., Perkin Trans. 1, 1976, 1048 DOI: 10.1039/P19760001048
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