Synthesis and Structural Studies of Homooligomers of Geminally Disubstituted 尾2,2-Amino Acids with Carbohydrate Side Chain

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• 作者：Gangavaram V. M. Sharma ; Post Sai Reddy ; Deepak Chatterjee ; Ajit C. Kunwar
• 刊名：Journal of Organic Chemistry
• 出版年：2011
• 出版时间：March 18, 2011
• 年：2011
• 卷：76
• 期：6
• 页码：1562-1571
• 全文大小：1121K
• 年卷期：v.76,no.6(March 18, 2011)
• ISSN：1520-6904

文摘

A new class of geminally disubstituted C-linked carbo-尾^2,2-amino acids (尾^2,2-Caa) were prepared from d-glucose. The structures of homooligomeric di-, tetra-, and hexapeptides prepared from (S)-尾^2,2-Caa were studied with NMR (in CDCl₃), CD, and Molecular Dynamics calculations. These 尾^2,2-peptides have shown the presence of stable 6-membered (6-mr) NH(i)路路路CO(i) intra-residue H-bonded (C₆) strands. It was found that the strand structures realized in these systems were additionally stabilized by the electrostatic interaction arising due to the proximity of amide proton (NH(i)) to the oxygen of the preceding methoxy group (O(Me)(i鈭?)) at the C3 carbon of the carbohydrate ring. The new 尾^2,2-Caa residues with additional support to H-bonding considerably expand the domain of foldamers.