Abstract
The reaction of S-tert-butyl thiopropionate with a number of N-benzyl or N-allyl aldimines ( 4) as promoted by the chiral diazaborolidine 1 and triethylamine afforded the β-amino acid esters 5 with high diastereoselectivity and enantioselectivity, providing a simple route to chiral β-lactams 6.
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