Synthesis and structural study of highly constrained hybrid cyclobutane-proline γ,γ-peptides
作者:Raquel Gutiérrez-Abad、Daniel Carbajo、Pau Nolis、Carles Acosta-Silva、Juan A. Cobos、Ona Illa、Miriam Royo、Rosa M. Ortuño
DOI:10.1007/s00726-011-0912-4
日期:2011.8
Two diastereomeric series of hybrid γ,γ-peptides derived from conveniently protected derivatives of (1R,2S)- and (1S,2R)-3-amino-2,2-dimethylcyclobutane-1-carboxylic acid and cis-4-amino-l-proline joined in alternation have efficiently been prepared through convergent synthesis. High-resolution NMR experiments show that these compounds present defined conformations in solution affording very compact
由(1 R,2 S)-和(1 S,2 R)-3-氨基-2,2-二甲基环丁烷-1-羧酸和顺式-通过收敛合成已经有效地制备了交替连接的4-氨基-1-脯氨酸。高分辨率NMR实验表明,这些化合物在溶液中呈现确定的构象,由于内部和内部残基之间存在氢键合环,因此结构非常紧凑。含(R,S)-环丁烷的肽比(S,R)非对映体。另外,所有这些γ-肽具有高聚集趋势,从而提供纳米级大小的囊泡,如通过透射电子显微镜所证实的那样,当放置数天时它们是稳定的。