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Verdoppelungsreaktionen beim Ringschluss von Peptiden. III. Cyclo-glycyl-L-leucyl-glycyl-glycyl-L-leucyl-glycyl. 9. Mitteilung über homodet cyclische Polypeptide

✍ Scribed by R. Schwyzer; B. Gorup

Publisher: John Wiley and Sons
Year: 1958
Tongue: German
Weight: 441 KB
Volume: 41
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19580410729

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✦ Synopsis

Abstract

Cyclization of the p‐nitrophenyl esters of glycyl‐L‐leucyl‐glycine, and of glycyl‐L‐leucyl‐glycyl‐glycyl‐L‐leucyl‐glycine yields the same crystalline cyclohexapeptide. The intermediates were synthesized via cyanomethyl esters.

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## 2 I X 69) SWWYZLW~J. The first proton magnetic resonance observations made with cyclic hexapcptidcs suggested the presence of two types of amide protons : one participating in intramolecular hydrogcn bonds and more strongly shiclded, the other exposed t o thc solvent and less shielded (SCHWYZER