New guanidinium-based carboxylate receptors derived from 5-amino-pyrrole-2-carboxylate: synthesis and first binding studies
作者:Carsten Schmuck、Jürgen Dudaczek
DOI:10.1016/j.tetlet.2005.08.115
日期:2005.10
The syntheses of two new guanidinium-based carboxylate receptors 2a,b derived from 5-amino pyrrole-2-carboxylate 4 are described. These receptors bind N-acetyl alanine carboxylate and O-acetyl lactate efficiently in aqueous DMSO as could be shown by NMR studies. However, compared to previously reported guanidiniocarbonyl pyrrole receptors 1, the reversal in the direction of the amide group in 2a,b
描述了衍生自5-氨基吡咯-2-羧酸盐4的两个新的基于胍基的羧酸盐受体2a,b的合成。如NMR研究所示,这些受体在水性DMSO中有效地结合N-乙酰丙氨酸羧酸盐和O-乙酰乳酸。然而,与先前报道的胍二羰基吡咯受体1相比,在2a,b中酰胺基团方向的逆转改变了底物选择性(酰胺现在比酯更优选)和它们的相对结合亲和力。可以基于计算出的复杂结构来解释这两种效果。