Synthesis and reactions of α-fluoro-α-amino amides

Clayson, Joanne; Bailey, Patrick D.; Boa, Andrew N.

Abstract

N-((S)-1-Phenylethyl)halofluoroethanamides have been investigated as precursors to N-protected α-fluoro-α-amino amides by nucleophilic displacement of halide with nitrogen nucleophiles such as potassium phthalimide, sodium succinimide, sodium glutarimide, trimethylamine and sodium azide. With single diastereoisomers of the iodofluoroethanamide, clean inversion of configuration occurs at room temperature, but subsequent epimerisation may occur as a result of the liberated iodide. The α-fluoro-α-amino amides made underwent a wide variety of reactions depending on conditions, but in many cases the carbon-fluorine bond was compromised. However, reacting trimethylamine and N-((S)-1-phenylethyl)iodofluoroethanamide gave the corresponding α-fluorobetaine amide, and subsequent acidic hydrolysis led to α-fluorobetaine as the first example of an 'unprotected' α-fluoroamino acid. (C) 2008 Elsevier Ltd. All rights reserved.

Citation

Bailey, P. D., Clayson, J., & Boa, A. N. (2009). Synthesis and reactions of α-fluoro-α-amino amides. Tetrahedron, 65(8), 1724-1736. https://doi.org/10.1016/j.tet.2008.11.061

• Journal Article Type: Article
• Acceptance Date: Nov 20, 2008
• Online Publication Date: Nov 27, 2008
• Publication Date: Feb 21, 2009
• Journal: TETRAHEDRON
• Print ISSN: 0040-4020
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 65
• Issue: 8
• Pages: 1724-1736
• DOI: https://doi.org/10.1016/j.tet.2008.11.061
• Keywords: Amino acids and derivatives; Peptide analogues/mimetics
• Public URL: https://hull-repository.worktribe.com/output/387104
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0040402008020322?via%3Dihub