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Volumn 54, Issue 9, 1998, Pages 1943-1952

Experimental studies of Lewis acid catalyzed additions of long chained alcohols to activated 1,4-benzoquinone

Author keywords

[No Author keywords available]

Indexed keywords

1,4 BENZOQUINONE DERIVATIVE; ALCOHOL DERIVATIVE; REAGENT;

EID: 0032567952     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4020(97)10409-4     Document Type: Article
Times cited : (6)

References (57)
  • 16
    • 0000964801 scopus 로고
    • Lewis acid carbonyl complexation
    • Trost, B. M., Ed.; Pergamon Press, Oxford
    • b) Shambayati, S.; Schreiber, S.L. Lewis Acid Carbonyl Complexation in Comprehensive Organic Synthesis; Trost, B. M., Ed.; Pergamon Press, Oxford, 1991, 283.
    • (1991) Comprehensive Organic Synthesis , pp. 283
    • Shambayati, S.1    Schreiber, S.L.2
  • 31
    • 0010575719 scopus 로고    scopus 로고
    • note
    • 5. The manuscript is in progress.
  • 33
    • 0010538741 scopus 로고
    • Grundmann, C.(ed), Georg Thieme, Stuttgart
    • b) Ulrich, H., Richter, R.20in Methoden der Organichen Chemie (Hauben Weyl), Grundmann, C.(ed), Georg Thieme, Stuttgart, 1977, vol.VII/3a pp. 44-46 and references therein
    • (1977) Methoden Der Organichen Chemie (Hauben Weyl) , vol.7 , Issue.3 A , pp. 44-46
    • Ulrich, H.1    Richter, R.2
  • 41
    • 0000070672 scopus 로고
    • 12. We used two distinct approaches to select the suitable LAs to the experiments. In one of the approaches, because the donor atoms of carbomethoxyquinones are hard Lewis base oxygen atoms, we thought that tighter and more stable complexes are formed between carbonyl oxygens and hard LAs. a) Laszlo, P.; Teston, M. J. Am. Chem Soc. 1990, 112, 8750.
    • (1990) J. Am. Chem Soc. , vol.112 , pp. 8750
    • Laszlo, P.1    Teston, M.2
  • 43
    • 37049090904 scopus 로고
    • c) Braddock, D. C.; Brown, J. M.; Guiry, P. J. J. Chem. Soc., Chem. Commun. 1993, 1244) On the other hand, as mentioned earlier enhancement of reactivity of the carbonyl groups can be achieved through a nonchelated or a chelated intermediate. A suitable example in this connection is the investigation of Chen et al.,
    • (1993) J. Chem. Soc., Chem. Commun. , vol.1244
    • Braddock, D.C.1    Brown, J.M.2    Guiry, P.J.3
  • 44
    • 0001332620 scopus 로고
    • d) Chen, X.; Hortelano, E. R.; Eliel, E. L.; Frye, S. V. J. Am. Chem Soc. 1992, 114, 1778, who compared the transition state energies of LAs and alkoxy ketones in chelated and nonchelated 1:1 complexes. They showed that complexation enhances the reactivity of the ketone and, furthermore, the chelated intermediate lowers the the transition state energy further and, thus, increases the reaction rate. The chelation restricts also bond rotation and increases stereoselectivity. Their results gave us a hint of promise on that a bidentate chelating metal could further diminished LUMO energy of the β-carbon and give an additional activation towards oxygen nucleophiles.
    • (1992) J. Am. Chem Soc. , vol.114 , pp. 1778
    • Chen, X.1    Hortelano, E.R.2    Eliel, E.L.3    Frye, S.V.4
  • 45
    • 0010575720 scopus 로고    scopus 로고
    • (equation presented)
    • 13. (equation presented)
  • 49
    • 0010634302 scopus 로고    scopus 로고
    • (equation presented)
    • 15. (equation presented)
  • 54
    • 0010605587 scopus 로고    scopus 로고
    • note
    • 17. Unidentified polar addition products, which remained on the baseline in t.l.c. analysis.
  • 55
    • 0010574386 scopus 로고    scopus 로고
    • (equation presented)
    • 18. (equation presented)
  • 56
    • 0010575582 scopus 로고    scopus 로고
    • unpublished results
    • 2 can be used as a catalyst in the reaction between inactivated quinone and long chained alcohols. We found that the catalyst did work also in this case, but only in 10 % yield. (Hormi, O. E. O.; Moilanen, A. M. unpublished results)
    • Hormi, O.E.O.1    Moilanen, A.M.2
  • 57
    • 0010608330 scopus 로고    scopus 로고
    • note
    • 19. When the decarbomethoxylation was carried out with 2-carbomethoxy-3-benzyloxyHQ (6f) using the same reaction conditions, only tarry material was produced.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.