Abstract
Abstract The Eu(fod)3- or Eu(dppm)3-catalyzed aldol reactions of the four chiral α-alkoxy aldehydes having different protecting groups with (E)- or (Z)-ketene silyl acetals are shown to provide the high levels of diastereocontrol, the sense depending on the nature of the protecting group. The catalytic stereo-modulation is explained in terms of the mode of aldehyde/catalyst complexation (chelation vs. nonchelation).
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