Synthesis of amine functionalized oxazolines with applications in asymmetric catalysis
作者:Jeremie J. Miller、Sridhar Rajaram、Cornelia Pfaffenroth、Matthew S. Sigman
DOI:10.1016/j.tet.2008.11.046
日期:2009.4
describes the synthesis of three classes of amine functionalized oxazolines that have been successfully used in asymmetric catalysis in our laboratory. Failed synthetic routes and significantly improved procedures are discussed including the synthesis of ligands for Nozaki–Hiyama–Kishi (NHK) carbonyl allylation reactions that do not require chromatography for purification.
The synthesis and conformational aspects of a novel dioxopiperazine—a possible β-turn constraint
作者:John S. Davies、Malgosia Stelmach-Diddams、Regis Fromentin、Alun Howells、Ron Cotton
DOI:10.1039/a904943f
日期:——
A synthetic route to a novel α,α-diamino β-keto ethoxycarbonyl-containing dioxopiperazine, capable of mimicking a β-turn, is reported. The cis configuration of the dioxopiperazine has been rationalised by NMR spectroscopy, while computational energy calculations have been used to explain the reluctance to cyclise of N-terminal partially protected dipeptides containing α,α-amino groups.
Z-Gly-Val-Ser-Phe-Val-Leu-OMe and related peptides were synthesized by the conventional solution method and their attractant and repellent activities for Aedes aegypti (mosquito) and Blattella germanica (cockroach) were examined. Z-Val-Leu-OMe exhibited potent repellent activity against not only Aedes aegypti but also Blattella germanica.
Fully Enzymatic N→C-Directed Peptide Synthesis Using C-Terminal Peptide α-Carboxamide to Ester Interconversion
作者:Timo Nuijens、Elena Piva、John A. W. Kruijtzer、Dirk T. S. Rijkers、Rob M. J. Liskamp、Peter J. L. M. Quaedflieg
DOI:10.1002/adsc.201000943
日期:2011.5.9
Chemoenzymatic peptidesynthesis is potentially the most cost‐efficient technology for the synthesis of short and medium‐sized peptides with some important advantages. For instance, stoichiometric amounts of expensive coupling reagents are not required and racemisation does not occur rendering purification easier compared to chemical peptidesynthesis. In this paper, a novel interconversion reaction
General and convenient syntheses of optically active 5-alkylpiperazine-2-carboxylic acids are described. The methods are based on cyclization of L- or D-serine with α-amino acids and occur without loss of optical purity. The presented procedures are based on readily available starting materials and can be arranged for multigram quantities.