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Organocatalytic Access to a cis-Cyclopentyl-γ-amino Acid: An Intriguing Model of Selectivity and Formation of a Stable 10/12-Helix from the Corresponding γ/α-Peptide
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2019-12-10 , DOI: 10.1021/jacs.9b10861
Rossana Fanelli 1 , Dénes Berta 1 , Tamás Földes 1 , Edina Rosta 1 , Robert Andrew Atkinson 2 , Hans-Jörg Hofmann 3 , Kenneth Shankland 4 , Alexander J A Cobb 1
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In this study, we have developed a highly enantioselective, organocatalytic route to the (1S,2R)-2-(aminomethyl)cyclopentane-1-carboxylic acid monomer, which has a cis-configuration between the C- and N-termini around the cyclopentane core. Kinetic measurements show that the product distribution changes over time due to epimerization of the C1 center. Computations suggest the cis-selectivity is a result of selective C-C bond formation, whilst subsequent steps appear to influence the selectivity at higher temperature. The resulting γ-amino acid residue was incorporated into a novel γ/α-peptide which forms a well-ordered 10/12-helix with alternate H-bond direction- ality in spite of the containing the smallest value of the ζ-angle yet observed for a helix of this type. This highly defined structure is a result of the narrow range of potential ζ- angles in our monomer. In contrast, the larger range of potential ζ-values observed for the corresponding trans-system can be fulfilled by several competing helical structures.

中文翻译:

有机催化获得顺式-环戊基-γ-氨基酸:从相应的 γ/α-肽形成稳定 10/12-螺旋的有趣模型

在这项研究中,我们开发了一种对 (1S,2R)-2-(氨基甲基)环戊烷-1-羧酸单体的高度对映选择性的有机催化路线,该单体的 C-和 N-末端之间具有顺式构型。环戊烷核心。动力学测量表明,由于 C1 中心的差向异构化,产物分布随时间变化。计算表明顺式选择性是选择性 CC 键形成的结果,而后续步骤似乎会影响更高温度下的选择性。产生的 γ-氨基酸残基被整合到一个新的 γ/α-肽中,它形成了一个有序的 10/12-螺旋,具有交替的 H 键方向性,尽管它含有最小的 ζ-角值。观察到这种类型的螺旋。这种高度明确的结构是我们单体中潜在 ζ 角范围狭窄的结果。相比之下,在相应的跨系统中观察到的更大范围的潜在 ζ 值可以通过几个相互竞争的螺旋结构来实现。
更新日期:2019-12-10
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