[formula: see text] Chlorophenylalanines eta 6-complexed to ruthenium undergo SNAr reactions with a variety of nucleophiles to form substituted phenylalanines exemplified by 4b. Extension of these reactions to intramolecular ruthenium-activated SNAr cyclizations led to three novel cyclic tripeptide systems (exemplified by 17 and 20).
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West et al. (1999) studied this question.
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