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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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Orthogonal solid‐phase synthesis of human gastrin‐I under mild conditions

TL;DR: An approach to the solid-phase segment condensation synthesis of the 17-peptide amide human gastrin-I has been developed, and results compare favorably with those from a stepwise assembly.
Journal ArticleDOI

Synthesis and polymerization of functionalized dendritic macromonomers

TL;DR: In this article, the synthesis of dendritic building blocks (dendrons) of the first generation and the second generation, which carry differently protected amine groups in the periphery, is reported.
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Lithium‐Salt Effects in Peptide Synthesis. Part I. Conditions for the Use of Lithium‐Salts in Coupling Reactions

TL;DR: In this paper, the influence of Li-salts on the course of peptide-coupling reactions was investigated, and the effects of salt additives such as LiCl, LiBr, LiClO 4, and ZnCl 2 on yields, sideproduct formation, racemisation, and reaction rates were reported.
Journal ArticleDOI

Synthesis and Application of Hexamethyl-1,1'-spirobiindane-Based Phosphine-Oxazoline Ligands in Ni-Catalyzed Asymmetric Arylation of Cyclic Aldimines.

TL;DR: A new type of chiral PHOX ligands based on a hexamethyl-1,1'-spirobiindane scaffold and incorporating both a phosphine and an oxazoline moiety are described, providing high yields and excellent enantioselectivities for Ni-catalyzed asymmetric arylation of cyclic N-sulfonyl imines with arylboronic acids leading to chiral amines.
Journal ArticleDOI

Synthese von Humaninsulin. II. Aufbau des cyclischen Fragments A(1–13)†‡

TL;DR: In this paper, a detailed account of the synthesis of the protected tridecapeptide A(1-13), BocGlyIleValGlu(OBut)Gln Ser(But)LeuOH (20), an essential intermediate in the recently published total synthesis of human insulin, is given.
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