| http://www.w3.org/ns/prov#value | - ing the L-amino acids. ##STR4## The resulting sultam derivative is then treated with a strong base such as lithium diisopropylamide (LDA) or n-butyl lithium, in an appropriate solvent such as tetrahydrofuran (THF), in the presence of a coordinating solvent such as hexamethylphosphoramide (HMPA) or N,N-dimethylpropyleneurea (DMPU) to give the resulting glycine derivative.
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