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Journal ArticleDOI

Eine neue Methode zur Synthese von Peptiden: Aktivierung der Carboxylgruppe mit Dicyclohexylcarbodiimid unter Zusatz von 1‐Hydroxy‐benzotriazolen

Wolfgang König, +1 more
- 01 Mar 1970 - 
- Vol. 103, Iss: 3, pp 788-798
TLDR
In this article, the authors show that 1-Hydroxy-benzotriazol and 1-hydroxy-acetyl carbodiimid-methode eignen sich als Zusatze bei der Dicyclohexylcarbodiimids-Methode zur Synthese von Peptiden, verhindern die N-Acyl-harnstoffbildung and fuhren in hoher Ausbeute.
Abstract
1-Hydroxy-benzotriazol sowie verschiedene kernsubstituierte 1-Hydroxy-benzotriazole eignen sich als Zusatze bei der Dicyclohexylcarbodiimid-Methode zur Synthese von Peptiden. Ihr Einflus auf die Racemisierung bei Peptidsynthesen wurde unter Anwendung des gaschromatographischen Racemisierungstests von Weygand u. Mitarbb.2) untersucht. Die neuen Zusatze senken die Racemisierung, verhindern die N-Acyl-harnstoffbildung und fuhren in hoher Ausbeute zu sehr reinen Peptiden.

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Role of the phenylalanine B25 side chain in directing insulin interaction with its receptor. Steric and conformational effects.

TL;DR: The results showed that the rate of dissociation of receptor-bound 125I-labeled insulin from isolated hepatocytes is enhanced by incubating cells with insulin or [naphthyl(2)-alanineB25]insulin, but not with analogs in which PheB25 is replaced by serine, leucine, or homophenylalanine; deletion of residues B26-B30, however, results in analogs that enhance the rate.
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Ester coupling reactions – an enduring challenge in the chemical synthesis of bioactive natural products

TL;DR: This review investigates the use of complex ester fragment couplings within natural product total synthesis campaigns and presents and discusses a collection of successful examples from the literature.
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Chemical activation of biochar for energy and environmental applications: a comprehensive review

TL;DR: In this article, a comprehensive overview on different chemical modification mechanisms and exploring their effects on Biochar physicochemical properties, functionalities, and applications is presented, where the nature of precursor materials, modification preparatory/conditions, and post-modification processes are considered in detail.
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Synthetic peptides analogous to the fimbrillin sequence inhibit adherence of Porphyromonas gingivalis.

TL;DR: The role and contribution of fimbriae in the binding of P. gingivalis to hydroxyapatite coated with saliva as a model for the pellicle-coated tooth surface and the observation that poly-L-lysine, bovine serum albumin, and defatted bovines serumalbumin, even at high concentrations, only partially blocked the binding, indicates that hydrophobic interactions are not the major forces involved in P.
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