Aromatic δ-peptides: design, synthesis and structural studies of helical, quinoline-derived oligoamide foldamers
作者:Hua Jiang、Jean-Michel Léger、Christel Dolain、Philippe Guionneau、Ivan Huc
DOI:10.1016/j.tet.2003.08.058
日期:2003.10
amide hydrogens and adjacent quinoline nitrogens. In the solid, the dimer adopts a planar crescent shape and the octamer a helical conformation. All NMR data are consistent with similar conformations in solution. The helices are apparently remarkably stable. Some of them remain helical even at 120°C in deuterated DMSO. The structural studies confirm the predictions made by computer and demonstrate the high
设计合成了8-氨基-4-异丁氧基-2-喹啉羧酸的低聚酰胺,其螺旋结构在固态下通过单晶X射线衍射表征,在溶液中通过11 H NMR。4-异丁氧基-8-硝基-2-喹啉羧酸甲酯的单体可以很容易地从2-硝基苯胺和二甲基乙炔二甲酸甲酯分三步制备。硝基的连续氢化,酯的皂化以及通过酰氯的胺和酸的偶合以收敛的方式得到二聚体,四聚体,六聚体,八聚体和十聚体。该低聚物显示出通过酰胺氢和相邻的喹啉氮之间的分子内氢键而稳定的弯曲构象。在固体中,二聚体采用平面的月牙形,而八聚体采用螺旋形。所有NMR数据均与溶液中的相似构象一致。螺旋显然很稳定。其中一些甚至在氘化DMSO中甚至在120°C时仍保持螺旋状。