Abstract
A new approach to the BOC-protected amino diol 1a via the opening of 3,4- cis-disubstituted β-lactam 3 with isobutylmagnesium chloride is described. Nonracemic β-lactam 3 could be obtained by enzymatic resolution of the 3-acetoxy-β-lactam 4 or from a chiral precursor, methyl (R)-(−)-mandelate.
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