Mechanistic studies of the reaction of the (S)-prolinol-derived O-silyl ketene N,O-acetal 1 with aromatic aldehydes are reported. Experiments with three 0-silyl ketene N,O-acetals derived from different 1,2-amino alcohols are also described and lead to a coherent mechanistic picture involving pseudorotation of trigonal bipyramidal organosilicon intermediates.
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Myers et al. (1992) studied this question.