R. Annunziata et al., SYNTHESIS OF BETA-LACTAMS OF HIGH ENANTIOMERIC PURITY BY CHIRAL LIGAND ACCELERATED OSMYLATION OF RACEMIC 4-(2-STYRYL)-AZETIDIN-2-ONES, Bioorganic & medicinal chemistry letters, 3(11), 1993, pp. 2397-2402
The catalytic osmylation of a series of 4-(2-styryl)-azetidin-2-ones c
arried out in the presence of dihydroquinidine-p-chlorobenzoate opens
access to synthetically useful precursors of beta-lactam antibiotics o
f high enantiomeric purity (ee up to 97%).