Investigation of folding patterns in homo-oligomers of (R)-β2,2-amino acids with carbohydrate side chain
作者:Gangavaram V.M. Sharma、Post Sai Reddy、Deepak Chatterjee、Ajit C. Kunwar
DOI:10.1016/j.tet.2012.02.032
日期:2012.6
interestingly stabilized by five-membered (mr) inter-residue H-bonds NH(i)⋯O(i-1) (furanoside) and a 6-mr intra-residue H-bond between amide proton (NH(i)) and the oxygen of –OMe(i) at the C3 carbon of the carbohydrate side chain. These results amply demonstrate that the ‘epimerization’ at the spiro carbon center has an effect on the conformational behavior of these peptides. Finding of these, H-bonding
该研究描述了新的β合成2,2-从偕二取代的β制成-肽2,2 -氨基酸和它们的折叠倾向。的([R)-C联碳氮化β 2,2 -氨基甲酸[([R)-β 2,2 -Caa]从制备d -葡萄糖并转换成同源寡聚二- ,四- ,和六肽。使用NMR(在CDCl 3中),CD,IR和MD计算进行构象研究。这些β2,2-肽通过五元(mr)残基间H-键NH(i)⋯O(i-1)(呋喃糖苷)和6-rr残基内酰胺键之间的酰胺质子(NH(i ))和–OMe(i)的氧在碳水化合物侧链的C3碳上。这些结果充分证明,螺碳中心的“表观异构化”对这些肽的构象行为有影响。发现的这些,H-粘合图案,这是不那么常见稳定折叠在这个类的β 2,2- -Caa衍生肽将进一步促进增强在foldamer的域。