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- W2068477570 abstract "Des dérivés de la thiazolidine carboxylate d'éthyle-4(R) sont obtenus sous la forme d'un mélange de diastéréoisomères dont le pourcentage est modifié par addition d'acide trifluoroacétique. Pharmacological properties of thiazolidine derivatives are of great interest. For this purpose we prepared two series: 2-hydroxyalkyl-4-carbethoxythiazolidines and 2-carbalkoxyalkyl-4-carbethoxythiazolidines. Their syntheses involve a condensation reaction between L-carbethoxy-cystein and several α-hydroxyketones or β-ketoesters. Compounds 4 and 5 was obtained as an unequal mixture of diastereoisomers. Protons nmr spectra at 300 MHz in the presence of trifluoroacetic acid shows a modification of diastereoisomer percentages which indicate the existence of an equilibrium through an imminium ion intermediate. Therefore, the stereoselectivity observed reflects the relative stability of the different diastereoisomers." @default.
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- W2068477570 date "1987-11-01" @default.
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- W2068477570 title "Synthèse et étude structurale de dérivés substitués en -2 du thiazolidine carboxylate d'éthyle-4 (R)" @default.
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- W2068477570 doi "https://doi.org/10.1002/jhet.5570240625" @default.
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