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Asymmetric synthesis of enantiomerically and diastereoisomerically enriched 4-[F or Br]-substituted glutamic acids

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Abstract

A novel simple synthetic protocol for the preparation of both (2S,4R)- and (2S,4S)-FGlu, applying Michael addition of methyl α-fluoroacrylate to a NiII complex of glycine Schiff base with BPB, was elaborated. In addition, same reaction of mentioned complex with ethyl α-bromoacrylate leads to the NiII complex of the Schiff base of BPB with (2S,4R)-4-bromo-glutamic acid monoester, that can be transformed into the corresponding complexes of 1-aminocyclopropane-1,2-dicarboxylic acid. The decomposition of the diastereoisomerically pure complexes leads to corresponding enantiomerically enriched (ee > 98%) amino acids.

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Abbreviations

Glu:

Glutamic acid

FGlu:

4-Fluoroglutamic acids

FDG:

2-Fluorodeoxyglucose

PET:

Positron emission tomography

BPB :

(S)-2-N-(N′-benzylprolyl)aminobenzophenone

Ni-BPB-Gly (1):

NiII complex of a Schiff’s base of BPB and glycine

AA:

Amino acid

d.r. :

Diastereomers ratio

de :

Diastereomeric excess

ee :

enantiomeric excess

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Acknowledgments

The authors thank Bayer Schering Pharma Aktiengesellschaft and RFBR (08-03-00466a) for financial support.

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Correspondence to Yuri N. Belokon.

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Experimental data available free of charge in the supplementary section.

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Belokon, Y.N., Maleev, V.I., Savel’eva, T.F. et al. Asymmetric synthesis of enantiomerically and diastereoisomerically enriched 4-[F or Br]-substituted glutamic acids. Amino Acids 39, 1171–1176 (2010). https://doi.org/10.1007/s00726-010-0551-1

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