J. Barluenga et al., CHIRAL 2-ALKOXY-1,3-BUTADIENES - SYNTHESIS AND FACE-SELECTIVITY IN DIELS-ALDER REACTIONS, Journal of the Chemical Society, Chemical Communications, (17), 1995, pp. 1785-1786
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 hig
h face-selectivity.