The passage of carbon dioxide through a solution of dimethyl acetylenedicarboxylate during the addition of two equivalents of a trialkyl phosphite leads to the formation of an ylide (3) which reacts with 4-nitrobenzaldehyde to give a furan (5) in which the heterocyclic oxygen and one of the β-carbon atoms in the furan ring are derived from the carbon dioxide.
D. V. Griffiths and J. C. Tebby, J. Chem. Soc., Chem. Commun., 1981, 607 DOI: 10.1039/C39810000607
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