Synthesis of Enantiopure 7-Substituted Azepane-2-carboxylic Acids as Templates for Conformationally Constrained Peptidomimetics
作者:Elena Cini、Giuseppe Bifulco、Gloria Menchi、Manuela Rodriquez、Maurizio Taddei
DOI:10.1002/ejoc.201101387
日期:2012.4
The introduction of a cyclic amino acid in a peptide is one of the best methods to rigidify a strand. A general approach towards a new class of seven-membered ring amino acids is described starting from (S)-tribenzyl glutamic acid γ-aldehyde, which reacts with β-keto phosphonates to generate the Horner–Wadsworth–Emmons product. In the presence of H2 and a Pd catalyst, a four-step process occurs involving
在肽中引入环状氨基酸是刚性链的最佳方法之一。从 (S)-三苄基谷氨酸 γ-醛开始描述了一种新的七元环氨基酸的一般方法,它与 β-酮膦酸酯反应生成霍纳-沃兹沃思-埃蒙斯产物。在 H2 和 Pd 催化剂存在下,发生四步过程,包括双键加氢、三个苄基保护基的氢解、亚胺形成和还原胺化,以产生良好的 7-取代氮杂环庚烷羧酸。