Chiral 2-alkoxy-1,3-butadienes are prepared from chiral alcohols, prop-2-ynyltriphenylphosphonium bromide and aldehydes; they undergo [4 + 2] cycloadditions to carbo- and hetero-dienophiles with moderate to high face-selectivity.
J. Barluenga, M. Tomás, A. Suárez-Sobrino and L. A. López, J. Chem. Soc., Chem. Commun., 1995, 1785 DOI: 10.1039/C39950001785
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