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- W2090901612 abstract "Linear tri- and tetrapeptide precursors of 2,5-piperazinedione were prepared and their conversion to spirocycic dipeptides was studied. In Vitro, using purified peptidase enzymes, the spirocyclic dipeptides (SpDp) were generated from the precursors by a two-step mechanism consisting in the proteolytic release of the C-terminal dipeptide, ethyl ester and its subsequent spontaneous cyclization. After intraperitoneal administration of urokinase and Ac-Leu-Lys-Gly-Acp-OEt, a SpDp precursor targeted to endogenous plasmin, or the administration of the activated Hageman factor fragment and Ac-Leu-Arg-Ala-Acp-OEt, a SpDp precursor, targeted to endogenous kallikrein, the generated corresponding C-terminal dipeptide ethylester intermediates and SpDp, cyclo (Gly-Acp) and cyclo (Ala-Acp), respectively, were detected in the blood serum of C57B1 mice. Suppression of partial amnesia induced by sodium nitrite was observed in rats where it was subcutaneously administered with H-Leu-Ala-Acp-OEt, a peptide precursor of alaptide, the active SpDp, i.e. cyclo (1-amino-1-cyclopentanecarbonyl-L-alanyl)." @default.
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- W2090901612 date "1992-01-01" @default.
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- W2090901612 title "Two-step generation of spirocyclic dipeptides from linear peptide ethyl ester precursors" @default.
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- W2090901612 doi "https://doi.org/10.1016/0024-3205(92)90271-p" @default.
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