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Two solid-phase approaches, involving the base-assisted intramolecularalkylation of N-chloroacetyl-Phe derivatives anchored to appropriatesolid supports, were investigated for the preparation of novel β-lactams. When a BAL-type strategy was used, the resin-bound azetidinones were easily formed, as established by MAS-NMR, but final compounds could not be removed from the resin, unless a suitable two...
A convenient and easy method based on 1H NMR spectroscopy with both external and internal standardsis described for the quantification of members of libraries.
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