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The aldol coupling of ketene silyl acetal 2 derived from the glycinate Schiff base with aldehydes can be efficiently catalyzed by an in situ generated, chiral quaternary ammonium fluoride of type 1 under mild, neutral conditions, affording the corresponding anti ‐β‐hydroxy‐α‐amino esters predominantly with excellent enantioselectivities.
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Ooi et al. (2004) studied this question.
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