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DOI: 10.1055/s-0043-1775371
α-Amino Acid Synthesis by 1,3-Nitrogen Migration: An Update
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 883212).
Abstract
An improved practical and efficient procedure for the synthesis of non-racemic unnatural α-amino acids through a stereocontrolled rearrangement is reported. Carboxylic acids are converted into azanyl esters RCO2NHBoc followed by an iron-catalyzed 1,3-nitrogen migration to provide non-racemic α-amino acids in an asymmetric (α-monosubstituted α-amino acids) or enantioconvergent fashion (α,α-disubstituted α-amino acids). Under optimized conditions using a fluorinated chiral iron catalyst and 2,2,6,6-tetramethylpiperidine as the base in a solvent mixture of 1,2-dichlorobenzene and CHCl3, enantioselectivities of up to 98% ee were obtained. Such high ee values are important for practical purposes, allowing the direct use of many of the obtained N-Boc-protected α-amino acids for subsequent applications.
Supporting Information
- Synthesis of catalysts, NMR spectra, and HPLC traces. Supporting information for this article is available online at https://doi.org/10.1055/s-0043-1775371.
- Supporting Information
Publikationsverlauf
Eingereicht: 28. März 2024
Angenommen nach Revision: 03. Mai 2024
Artikel online veröffentlicht:
17. Juni 2024
© 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)
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Reviews on applications of unnatural and non-proteinogenic α-amino acids:
Reviews on the synthesis of α-amino acids:
For recent examples on the asymmetric synthesis of α-amino acids, see: