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Abstract
We previously reported a potent calpain inhibitor 1 (SJA6017, N-(4-fluorophenyl)-l-valyl-l-leucinal), which displayed relatively low oral bioavailability (BA). Replacing the metabolically labile aldehyde moiety of 1with more chemically stable warheads, such as a cyclic hemiacetal, hydrazone, and alpha-ketoamide, provided the inhibitors with improved in vitro metabolic stability. Cyclic hemiacetal 2 was the most stable of these compounds. The optimization of 2 led to hemiacetal 8 (SNJ-1715) which exhibited high potency, good aqueous solubility, excellent oral BA, and prolonged plasma half-life in rats. Furthermore, 8 showed neuroprotective efficacy via oral administration in a rat retinal ischemia model.
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