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Chiral Induction and Remote Chiral Communication in Quinoline Oligoamide Foldamers for Determination of Enantiomeric Excess and Absolute Configuration of Chiral Amines and Their Derivatives |
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| Authors: | Dr Lu Zheng Yulin Zhan Lin Ye Dan Zheng Dr Ying Wang Prof Kun Zhang Prof Hua Jiang |
| Institution: | 1. School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, 529020 P. R. China
International Healthcare Innovation Institute (Jiangmen), Jiangmen, 529040 P. R. China School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006 P. R. China The authors contributed equally to this work.;2. College of Chemistry, Beijing Normal University, Beijing, 100875 P. R. China The authors contributed equally to this work.;3. College of Chemistry, Beijing Normal University, Beijing, 100875 P. R. China;4. School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, 529020 P. R. China International Healthcare Innovation Institute (Jiangmen), Jiangmen, 529040 P. R. China;5. School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, 529020 P. R. China |
| Abstract: | Two pentameric foldamers, Q5 and Q5C-S , containing a C−F bond were synthesized based on quinoline oligamide foldamers for the measurement of enantiomeric excess and for the determination of absolute configuration of chiral amines, diamines, amino alcohols, and α-amino acid esters. Chiral induction of Q5 was triggered in situ when the chiral analytes reacted with the C−F bond in Q5 by a N-nucleophilic substitution reaction, leading to a linear correlation between the CD amplitude at the region of quinoline chromophores and the ee values of the chiral analytes, which can be used for the ee determination of chiral analytes. Furthermore, the CD intensity of Q5C-S containing a chiral motif at its C-terminus enhances via remote, favorable chiral communication when the chiral induction was triggered in situ by chiral analytes at the N-terminus matches the original helicity of Q5C-S , but decreases via remote, conflicted chiral communication when the chiral induction is triggered in situ by chiral molecules at the N-terminus mismatches the original one. The system can thus be used for determination of the absolute configuration of chiral analytes, given that the chirality of the chiral motif at the C-terminus of Q5C-S is known. |
| Keywords: | chirality chiral induction circular dichroism configuration determination helical structures noncovalent interactions |