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Volumn , Issue 14, 2004, Pages 2553-2557

Effect of tether length on Ti(III)-mediated cyclization of epoxyalkenes and unsaturated epoxyketones

Author keywords

Cyclobutanodiol; Cyclooctanodiol; Radical cyclization; Titanocene chloride; Unsaturated epoxyketones

Indexed keywords

ALKENE DERIVATIVE; CARBON; EPOXIDE; EPOXYKETONE; KETONE DERIVATIVE; TITANIUM; TITANOCENE CHLORIDE; UNCLASSIFIED DRUG;

EID: 9644278032     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2004-834824     Document Type: Article
Times cited : (33)

References (41)
  • 1
    • 0001216647 scopus 로고
    • Trost, B. M.; Fleming, I.; Paquette, L. A., Eds.; Pergamon: Oxford
    • (a) Curran, D. P. In Comprehensive Organic Synthesis, Vol. 4; Trost, B. M.; Fleming, I.; Paquette, L. A., Eds.; Pergamon: Oxford, 1991, 815.
    • (1991) Comprehensive Organic Synthesis , vol.4 , pp. 815
    • Curran, D.P.1
  • 7
    • 0000684947 scopus 로고    scopus 로고
    • Renaud, P.; Sibi, M. P., Eds.; Wiley-VCH: Weinheim
    • Srikrishna, A. In Radicals in Organic Synthesis, Vol. 2; Renaud, P.; Sibi, M. P., Eds.; Wiley-VCH: Weinheim, 2001, 151.
    • (2001) Radicals in Organic Synthesis , vol.2 , pp. 151
    • Srikrishna, A.1
  • 26
    • 9644263297 scopus 로고    scopus 로고
    • note
    • 2 at-30 °C. The starting aldehydes I (n = 0, 1, 2, 3) have been reported in the literature,
  • 30
    • 9644264781 scopus 로고    scopus 로고
    • note
    • 4 (60%) in THF. All compounds synthesized are racemic, although only one enantiomer is depicted (Figure 3).
  • 31
    • 9644290187 scopus 로고    scopus 로고
    • note
    • (b) The epoxyketones 6-9 were obtained by a three-step sequence from the aldehydes I, n = 0, 1, 2, 3:
  • 32
    • 9644271776 scopus 로고    scopus 로고
    • note
    • i) Grignard reaction with vinyl magnesium bromide,
  • 33
    • 9644308657 scopus 로고    scopus 로고
    • note
    • ii) oxidation with Dess-Martin reagent,
  • 34
    • 9644259835 scopus 로고    scopus 로고
    • note
    • and iii) epoxidation with mCPBA.
  • 35
    • 84986694101 scopus 로고
    • (c) The structure of epoxyketones 6-10, in which the oxiranic oxygen and the side chain is cis, is based on spectroscopic data and comparison with the epoxy compound described by K. Mori et al., whose structure was determined by X-ray. See: Mori, K.; Aki, S.; Kido, M. Liebigs Ann. Chem. 1993, 83. Equation Presented
    • (1993) Liebigs Ann. Chem. , pp. 83
    • Mori, K.1    Aki, S.2    Kido, M.3
  • 36
    • 9644265998 scopus 로고    scopus 로고
    • note
    • 2O. After removal of the solvent, the crude product was purified by flash chromatography. All homolytic cleavages were absolutely selective and always afforded the tertiary radical.
  • 37
    • 9644271775 scopus 로고    scopus 로고
    • note
    • +]: 280.2038. Found: 280.2033.
  • 39
    • 9644304907 scopus 로고    scopus 로고
    • note
    • The diastereomer the 6 afforded exclusively bicyclic diol 6a′ in 70% yield (Scheme 6). Equation Presentation
  • 40


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