Stereoselective approach to uncommon tripeptides incorporating a 2,6-diaminopimelic acid framework: X-ray analysis and conformational studies. Part 4
作者:Daniele Balducci、Sara Crupi、Roberta Galeazzi、Fabio Piccinelli、Gianni Porzi、Sergio Sandri
DOI:10.1016/j.tetasy.2005.01.047
日期:2005.3
pseudopeptides 4, 5, 8, 9, 13 and 14, incorporating 2,6-diamino-4-methylen-1,7-heptanedioic acid residue, has been accomplished starting from the l-valine derived chiral synthon 1. The absolute configuration of new stereocentres was assigned on the basis of 1H NMR spectra. The geometry of these unnatural tripeptides was deduced on the basis of 1H NMR parameters and IR spectra. X-ray analysis of the unusual peptide
假肽的立体选择性合成4,5,8,9,13和14,结合2,6-二氨基-4-亚甲基-1,7-庚二酸残基,已经完成从L-缬氨酸开始衍生的手性合成子1。新的立体中心的绝对构型是根据1 H NMR光谱确定的。这些非天然三肽的几何结构是根据1 H NMR参数和IR光谱推导的。不寻常的肽的X射线分析18的和构象研究5,9和14 也有报道。