The peptide derivative Z-Arg-Lys-AOMK (1) was developed in our laboratories as a neutral pH-selective inhibitor of cathepsin B (Cat.B).5 Cat.B is believed to be released upon cellular injury from acidic lysosomes into the neutral pH cytoplasm and initiate and mediate inappropriate proteolytic degradation. Such sequelae are thought to be relevant to the pathogenesis observed with traumatic brain injury and neuropathies such as Alzheimer’s Disease. Our ongoing in vivo evaluations of Z-Arg-Lys-AOMK for its potential neurotherapeutic potential necessitated the scaled-up synthesis of this inhibitor.5 Upon embarking on this endeavor, we encountered several problems with the methodology employed in the previously published synthesis (Figure 1), which utilized solid-phase peptide synthesis and produced insufficient amounts of Z-Arg-Lys-AOMK
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