The sequential reaction of diethyl phosphite with sodium alkoxide, dimethyl maleate and aldehydes affords substituted (E)-3-alkoxycarbonyl-β,γ-unsaturated esters in 63–73% yields.
Y. Shen and Z. Zhang, J. Chem. Res. (S), 1998, 642 DOI: 10.1039/A803769H
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