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Volumn 73, Issue 2, 2008, Pages 374-382

A simple helical macrocyclic polyazapyridinophane as a stereoselective receptor of biologically important dicarboxylates under physiological conditions

Author keywords

[No Author keywords available]

Indexed keywords

POTENTIOMETRIC TITRATIONS; STEREOSELECTIVE RECEPTOR;

EID: 40949093462     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo701636b     Document Type: Article
Times cited : (34)

References (74)
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    • (1996) Comprehensive Supramolecular Chemistry
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    • 34250899195 scopus 로고    scopus 로고
    • For a very recent review on supramolecular chemistry in water, see
    • For a very recent review on supramolecular chemistry in water, see: Oshovsky, G. V.; Reinhoudt, D. N.; Verboom, W. Angew. Chem., Int. Ed. 2007, 46, 2366.
    • (2007) Angew. Chem., Int. Ed , vol.46 , pp. 2366
    • Oshovsky, G.V.1    Reinhoudt, D.N.2    Verboom, W.3
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    • 33644782072 scopus 로고    scopus 로고
    • For a review on enantioselective recognition of chiral anions: a
    • For a review on enantioselective recognition of chiral anions: (a) Stibor, I.; Zlatuskova, P. Top. Curr. Chem. 2005, 255, 31.
    • (2005) Top. Curr. Chem , vol.255 , pp. 31
    • Stibor, I.1    Zlatuskova, P.2
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    • Campbell, M. M, Blagbrough, I. S, Eds, Royal Society of Chemistry: Cambridge, UK
    • (a) Jane, D. E. In Medicinal Chemistry into the Millenium; Campbell, M. M., Blagbrough, I. S., Eds.; Royal Society of Chemistry: Cambridge, UK, 2001; pp 67-84.
    • (2001) Medicinal Chemistry into the Millenium , pp. 67-84
    • Jane, D.E.1
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    • Hardman, J. G, Goodman Gilman, A, Limbird, L. E, Eds, McGraw-Hill: New York, Chapter 22, p
    • (b) Standaert, D. G.; Young, A. B. In The Pharmacological Basis of Therapeutics; Hardman, J. G., Goodman Gilman, A., Limbird, L. E., Eds.; McGraw-Hill: New York, 1996; Chapter 22, p 503.
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    • Standaert, D.G.1    Young, A.B.2
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    • Geometry optimization was performed at the HF/3-21G* level of theory as implemented in Spartan 04 software.
    • Geometry optimization was performed at the HF/3-21G* level of theory as implemented in Spartan 04 software.
  • 58
    • 41149164240 scopus 로고    scopus 로고
    • The microscopic protonation sites for macrocyclic polyamines is a controversial topic, as protons can freely move around the macrocyclic structure, especially in a polar protic solvent. In this particular system, we have calculated two different protonation scheme possibilities, the one depicted in Figure 3 and that one with alternated ammonium groups (given in Figure S4 in the Supporting Information, Both optimized structures showed very similar geometries and energies, although the one in Figure 3 is more stable, probably because the distance between positive charges in the twisted helical geometry is actually larger 4.52 vs. 4.28 Å, Thus, we followed the criteria of setting the protons maximizing the distance between protonation sites, within the helical conformation. For a deeper discussion on this topic, see refs 8a and 15. A more accurate description of the real situation would be the equilibrium between all the possible protonation sites. However, as the geometry of the
    • The microscopic protonation sites for macrocyclic polyamines is a controversial topic, as protons can freely move around the macrocyclic structure, especially in a polar protic solvent. In this particular system, we have calculated two different protonation scheme possibilities, the one depicted in Figure 3 and that one with alternated ammonium groups (given in Figure S4 in the Supporting Information). Both optimized structures showed very similar geometries and energies, although the one in Figure 3 is more stable, probably because the distance between positive charges in the twisted helical geometry is actually larger (4.52 vs. 4.28 Å). Thus, we followed the criteria of setting the protons maximizing the distance between protonation sites, within the helical conformation. For a deeper discussion on this topic, see refs 8a and 15. A more accurate description of the real situation would be the equilibrium between all the possible protonation sites. However, as the geometry of the macrocycle is not changed by this fast prototropic process, our conformational rationale is valid using one of the structures, and we have done it for simplicity. We thank the comments from a referee who drove our attention to the need for explaining this topic.
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    • -1) was used as an internal standard for every sample. Although D values are dependent on solvent, temperature, and concentration of the sample, as the measurements were performed under the same experimental conditions for samples containing either (R)-3 or (S)-3, a direct comparison should be suitable to extract conclusions.
    • -1) was used as an internal standard for every sample. Although D values are dependent on solvent, temperature, and concentration of the sample, as the measurements were performed under the same experimental conditions for samples containing either (R)-3 or (S)-3, a direct comparison should be suitable to extract conclusions.
  • 63
    • 1642549173 scopus 로고    scopus 로고
    • -2). Also see: Edward, J. T. J. Chem. Educ. 1970, 47, 261.
    • -2). Also see: Edward, J. T. J. Chem. Educ. 1970, 47, 261.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.