Abstract
A mild and efficient procedure for the selective cleavage of N -benzhydryl protecting group of β-lactams
is described. The protected 2-azetidinones 4 ,
precursors of carbapenems, were treated with a stoichiometric amount
of N -bromosuccinimide and a catalytic
amount of bromine under sun light irradiation in CH2 Cl2 -H2 O mixture
at 20 °C for 3 hours. The N -benzhydrol
intermediates 6 , which could be isolated,
were then hydrolyzed with p -TsOH in aqueous
acetone to furnish β-lactams 7 and
benzophenone quantitatively.
Key words
antibiotics - halogenation - protecting groups - benzhydryl derivatives - stable hemiaminals
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