Chiral differentiation of some cyclic beta-amino acids by kinetic and fixed ligand methods.

Chiral differentiation of some cyclic beta-amino acids by kinetic and fixed ligand methods.
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DOI:
10.1002/jms.1704
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发表时间:
2010-02
期刊:
Journal of mass spectrometry : JMS
影响因子:
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通讯作者:
A. Hyyryläinen;Jaana M. H. Pakarinen;E. Forró;F. Fülöp;P. Vainiotalo
A. Hyyryläinen;Jaana M. H. Pakarinen;E. Forró;F. Fülöp;P. Vainiotalo
中科院分区:
其他
文献类型:
--
作者:
A. Hyyryläinen;Jaana M. H. Pakarinen;E. Forró;F. Fülöp;P. Vainiotalo

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用动力学方法研究了含两个手性中心的β-氨基酸对映体在三聚体金属络合物中的拆分。研究了四种β-氨基酸对映体:顺式-(1 R,2S)-、顺式-(1 S,2 R)-、反式-(1 R,2 R)-和反式-(1 S,2S)-2-氨基环戊烷羧酸(环戊烷β-氨基酸),以及顺式-(1 R,2S)-、顺式-(1 S,2 R)-、反式-(1 R,2 R)-和反式-(1 S,2S)-2-氨基环己烷羧酸(环己烷β-氨基酸)。结果表明,金属离子(Cu(2+)、Ni(2+))和手性参比化合物(α-和β-氨基酸)的选择对手性选择性有影响。特别地,注意到参考化合物的芳香性增强了对映选择性。然后将固定配体动力学方法(动力学方法的修改)应用于相同的β-氨基酸,使用二肽作为固定配体。用这种方法,含有芳香族侧链的二肽增强了对映选择性。
Differentiation of beta-amino acid enantiomers with two chiral centres was investigated by kinetic method with trimeric metal-bound complexes. Four enantiomeric pairs of beta-amino acids were studied: cis-(1R,2S)-, cis-(1S,2R)-, trans-(1R,2R)- and trans-(1S,2S)-2-aminocyclopentanecarboxylic acids (cyclopentane beta-amino acids), and cis-(1R,2S)-, cis-(1S,2R)-, trans-(1R,2R)-, and trans-(1S,2S)-2-aminocyclohexanecarboxylic acids (cyclohexane beta-amino acids). The results showed that the choice of metal ion (Cu(2+), Ni(2+)) and chiral reference compound (alpha- and beta-amino acids) had an effect on the enantioselectivity. Especially, aromaticity of the reference compound was noted to enhance the enantioselectivity. The fixed-ligand kinetic method, a modification of the kinetic method, was then applied to the same beta-amino acids, with dipeptides used as fixed ligands. With this method, dipeptide containing an aromatic side chain enhanced the enantioselectivity.