Intramolecular nucleophilic attack onto allylsulfonates promoted by silica gel acting
as an acid catalyst provides expedient stereoselective access to 4,5-difunctionalized
oxazolidin-2-ones. Precursors were prepared efficiently from enantiopure α-amino acids
and subsequent manipulation of the oxazolidin-2-ones yielded enantiopure α-hydroxy-β-amino
acids.
oxazolidin-2-one - intramolecular SN2′ cyclization - AHPBA - silica gel - α-hydroxy-β-amino acids