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- W2423193523 abstract "The synthesis of pelargonoyl-cyclic decapeptide, analog of polymycin B1, is described. The open-chain protected decapeptide was synthesized on a polymer support, starting with threonine as the C-terminal amino acid residue, and was cleaved satisfactorily by hydrazinolysis. The alpha-amino protecting Boc-group was removed with HCl (1 mol/l) acetic acid and the resulting decapeptide hydrazide was converted to the azide with nitrous acid. Cyclization of the azide in pyridine at peptide concentration 2.5.10(-5) mol/l gave the penta-benzyloxycarbonyl-substituted decapeptide in 65% yield. Catalytic hydrogenation afforded the pelargonoyl cyclic decapeptide pentahydrochloride (6) in 75% yield. The synthetic product (6) exhibited an activity comparable to that of the natural polymyxin B1 against Bacillus subtilis and Staphylococcus aureus, whereas it showed only 2% of the activity to Escherichia coli2." @default.
- W2423193523 created "2016-06-24" @default.
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- W2423193523 date "1980-01-01" @default.
- W2423193523 modified "2023-09-23" @default.
- W2423193523 title "Synthesis of pelargonoyl-cyclic decapeptide analog of the antibiotic polymyxin B.1." @default.
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