Title: Quaternary β<sup>2,2</sup>‐Amino Acids: Catalytic Asymmetric Synthesis and Incorporation into Peptides by Fmoc‐Based Solid‐Phase Peptide Synthesis
Abstract: β-Amino acid incorporation has emerged as a promising approach to enhance the stability of parent peptides and to improve their biological activity. Owing to the lack of reliable access to β2,2 -amino acids in a setting suitable for peptide synthesis, most contemporary research efforts focus on the use of β3 - and certain β2,3 -amino acids. Herein, we report the catalytic asymmetric synthesis of β2,2 -amino acids and their incorporation into peptides by Fmoc-based solid-phase peptide synthesis (Fmoc-SPPS). A quaternary carbon center was constructed by the palladium-catalyzed decarboxylative allylation of 4-substituted isoxazolidin-5-ones. The N-O bond in the products not only acts as a traceless protecting group for β-amino acids but also undergoes amide formation with α-ketoacids derived from Fmoc-protected α-amino acids, thus providing expeditious access to α-β2,2 -dipeptides ready for Fmoc-SPPS.
Publication Year: 2017
Publication Date: 2017-11-23
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
Access and Citation
Cited By Count: 65
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