Synthesis of (S)- and (R)-5-Oxo-piperazine-2-Carboxylic Acid and Its Application to Peptidomimetics

被引:10
|
作者
Guitot, Karine [1 ,2 ]
Carboni, Stefano [2 ]
Reiser, Oliver [1 ]
Piarulli, Umberto [2 ]
机构
[1] Univ Regensburg, Inst Organ Chem, D-93053 Regensburg, Germany
[2] Univ Insubria, Dipartimento Sci Chim & Ambientali, I-22100 Como, Italy
来源
JOURNAL OF ORGANIC CHEMISTRY | 2009年 / 74卷 / 21期
关键词
STEREOSELECTIVE TOTAL-SYNTHESIS; PIPECOLIC ACID; ASYMMETRIC-SYNTHESIS; PEPTIDE-BONDS; DERIVATIVES; ENANTIOMERS; RESOLUTION; ANALOGS; MODEL;
D O I
10.1021/jo901389q
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A straightforward synthesis of (S)- and (R)-N-Boc-5-oxopiperazine-2-carboxylic acid is reported starting from L- or D-serine and ethyl glyoxylate. Those were evaluated as constituents in two tetrapeptides by studying their secondary Structure by H-1 NMR spectroscopy. In the case of Boc-Val-(S)-PCA-Gly-Leu-OMe, two readily interconverting conformations (in a 40%: 60% ratio) were observed, differing for the cis-trans isomerizaton of the tertiary amide bond, while Boc-Val-(R)-PCA-Gly-Lcu-OMe displayed an equilibrium between a gamma-turn and it type II beta-turn conformation.
引用
收藏
页码:8433 / 8436
页数:4
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