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Volumn 72, Issue 7, 2007, Pages 2460-2468

Assessing the suitability of 1,2,3-triazole linkers for covalent immobilization of chiral ligands: Application to enantioselective phenylation of aldehydes

Author keywords

[No Author keywords available]

Indexed keywords

ALCOHOLS; ALDEHYDES; CHIRALITY; COVALENT BONDS; ENANTIOSELECTIVITY; LIGANDS; RESINS;

EID: 34047194291     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo0624952     Document Type: Article
Times cited : (109)

References (61)
  • 1
    • 34047219895 scopus 로고    scopus 로고
    • Reviews on immobilized catalysts include the following: (a) Immobilized Catalysts: Solid Phases, Immobilization and Applications. In Topics in Current Chemistry; Kirschning, A., Ed.; Springer GmbH: Berlin, 2004; 242, pp 1-336.
    • Reviews on immobilized catalysts include the following: (a) Immobilized Catalysts: Solid Phases, Immobilization and Applications. In Topics in Current Chemistry; Kirschning, A., Ed.; Springer GmbH: Berlin, 2004; Vol. 242, pp 1-336.
  • 3
    • 0345732180 scopus 로고    scopus 로고
    • For a recent review, see
    • For a recent review, see: Jas, G.; Kirschning, A. Chem. Eur. J. 2003, 9, 5708-5723.
    • (2003) Chem. Eur. J , vol.9 , pp. 5708-5723
    • Jas, G.1    Kirschning, A.2
  • 24
    • 0001286347 scopus 로고    scopus 로고
    • The asymmetric reduction of a suitable diaryl ketone precursor is usually hampered by low ee's due to the steric and electronic similarities between both aryl groups, see, and references therein
    • The asymmetric reduction of a suitable diaryl ketone precursor is usually hampered by low ee's due to the steric and electronic similarities between both aryl groups, see, for instance: Ohkuma, T.; Koizumi, M.; Ikehira, H.; Yokozawa, T.; Noyori, R. Org. Lett. 2000, 2, 659-662 and references therein.
    • (2000) Org. Lett , vol.2 , pp. 659-662
    • for instance1    Ohkuma, T.2    Koizumi, M.3    Ikehira, H.4    Yokozawa, T.5    Noyori, R.6
  • 37
    • 34047209574 scopus 로고    scopus 로고
    • Product specifications provided by the vendor Novabiochem
    • Product specifications provided by the vendor (Novabiochem).
  • 39
    • 34047225852 scopus 로고    scopus 로고
    • For the nitrogen-containing resins, the degree of functionalization, f[mmol of functional fragment/g of resin] is calculated from the results of elemental analysis with the formula f, 0.714/n%N, where n is the number of nitrogen atoms in the functional unit and %N is the percent of nitrogen provided by the elemental analysis. For a given resin, the maximum possible substitution level fmax [mmol of functional fragment/g of resin] can be calculated with the formula fmax, fo/[1, fo(ΔMw) 10-3, where fo is the functionalization of the starting resin and ΔMw is the difference in molecular weight between the final and the initial functional fragments. The yield, ) of the considered step can then be evaluated as 100f/fmax
    • max.
  • 41
    • 34047231019 scopus 로고    scopus 로고
    • 6 overnight before acquisition of the NMR spectra with the HRMAS probe.
    • 6 overnight before acquisition of the NMR spectra with the HRMAS probe.
  • 48
    • 34047230541 scopus 로고    scopus 로고
    • On the opposite side, when a low-loading resin (f = 0.29) prepared from a commercial Merrifield resin by reaction with defect sodium azide, capping with MeOH, and cycloaddition with amino alcohol 3a was used in the reaction, the enantiomeric purity of the resulting carbynol was 60 %. It is thus suggested that functionalization of the resin has an optimal value in the vicinity of f = 0.6 for this particular reaction.
    • On the opposite side, when a low-loading resin (f = 0.29) prepared from a commercial Merrifield resin by reaction with defect sodium azide, capping with MeOH, and cycloaddition with amino alcohol 3a was used in the reaction, the enantiomeric purity of the resulting carbynol was 60 %. It is thus suggested that functionalization of the resin has an optimal value in the vicinity of f = 0.6 for this particular reaction.
  • 50
    • 34047228163 scopus 로고    scopus 로고
    • For example, phenylation of p-tolualdehyde with a Merrifield resin substituted with (R)-2-piperazino-1,1,2-triphenylethanol as the ligand 5 , furnishes the alcohol with 94% ee under similar conditions; see ref 5c
    • For example, phenylation of p-tolualdehyde with a Merrifield resin substituted with (R)-2-piperazino-1,1,2-triphenylethanol as the ligand (5 %) furnishes the alcohol with 94% ee under similar conditions; see ref 5c.
  • 61
    • 0038762733 scopus 로고    scopus 로고
    • Wavefuction, Inc, Irvine, CA
    • Spartan 02; Wavefuction, Inc.: Irvine, CA.
    • Spartan 02


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.