The addition of two equivalents of gaseous BF3 to to α- and β-alkoxy aldehydes having a centre of chirality at the α-position leads to doubly complexed species which react diastereoselectively with silyl enol ethers and allylsilanes to provide non-chelation-controlled adducts.
M. T. Reetz and K. Kesseler, J. Chem. Soc., Chem. Commun., 1984, 1079 DOI: 10.1039/C39840001079
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