A Highly Stereoselective Addition of the Anion Derived from α‐Diazoacetamide to Aromatic N‐Tosylimines

In the presence of an Evans oxazolidinone as the chiral auxiliary, the anion derived from α-diazoacetamide adds to aromatic N-tosylimines with high stereoselectivity (see scheme). The addition products can be used in a concise and stereoselective synthesis of syn- and anti-α-hydroxy-β-amino acid derivatives.