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Divergent synthesis of biologically active l-threo-β-hydroxyaspartates from common trans-oxazolidine dicarboxylate

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Abstract

A divergent synthetic strategy starting from a common trans-oxazolidine dicarboxylate intermediate has been successful to produce several non-proteinogenic l-threo-β-hydroxyaspartate derivatives efficiently with high stereoselectivity. Three bioactive α-amino-β-hydroxy acids, l-threo-β-hydroxyaspartic acid, l-threo-β-hydroxyasparagine, and l-threo-β-benzyloxyaspartic acid, were synthesized in good yields (58–83%) from the common chiral intermediate, and the chemoselective peptide bond formation at the α-amino group, β-hydroxy group, or α-carboxylic acid of the common intermediate was possible to afford the corresponding dipeptide, tripeptide, or didepsipeptide intermediate in 46~77% yields (in three-to-four steps) due to the orthogonal protective groups on the chiral intermediate.

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Fig. 1
Scheme 1.

Abbreviations

l-tHyAsp:

L-threo-β-Hydroxyaspartic acid

l-tHyAsn:

L-threo-β-hydroxyasparagine

PhSO2CH2NO2 :

Phenylsulfonylnitromethane

TBS:

t-Butyldimethylsilyl

TBAF:

Tetrabutylammonium fluoride

l-TBOA:

L-threo-β-benzyloxyaspartic acid

N-Boc-l-Val:

N-Boc protected l-valine

l-Leu-OMe:

L-leucine methyl ester

EDC:

1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide

TLC:

Thin-layer chromatography

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Acknowledgements

We would like to thank the BK-21 Four Program, the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy for financial support. This work was also supported by a grant from the Institute of Chemical Processes at Seoul National University.

Funding

This work was financially supported by the BK-21 Four Program, the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy.

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Correspondence to Young Gyu Kim.

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Handling editor: A. Jirgensons.

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Lee, Y., Seo, Y., Lee, B. et al. Divergent synthesis of biologically active l-threo-β-hydroxyaspartates from common trans-oxazolidine dicarboxylate. Amino Acids 54, 1601–1610 (2022). https://doi.org/10.1007/s00726-022-03196-8

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  • DOI: https://doi.org/10.1007/s00726-022-03196-8

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