The enolate of the 2-deoxy-3-oxo pyranoside (1) undergoes aldol additions from the β-face exclusively, and so stereoselectivity of the reaction apparently relies entirely on control elements in the aldehyde, such as α- or α,β-chelation.
K. Yu and B. Fraser-Reid, J. Chem. Soc., Chem. Commun., 1989, 1442 DOI: 10.1039/C39890001442
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