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Volumn 13, Issue 24, 2011, Pages 6524-6527

Deslongchamps annulations with benzoquinone monoketals

Author keywords

[No Author keywords available]

Indexed keywords

BENZOQUINONE; BENZOQUINONE DERIVATIVE; CYCLOHEXANONE DERIVATIVE; KETONE; SPIRO COMPOUND; SPIRONOLACTONE;

EID: 84055178168     PISSN: 15237060     EISSN: 15237052     Source Type: Journal    
DOI: 10.1021/ol202809y     Document Type: Article
Times cited : (25)

References (77)
  • 1
    • 44649110874 scopus 로고    scopus 로고
    • Wiley-VCH:Weinheim
    • E. g.: (a) Breitmaier, E. Terpenes;Wiley-VCH:Weinheim, 2006.
    • (2006) Terpenes
    • Breitmaier, E.1
  • 42
    • 0000634134 scopus 로고
    • Cem. Abs. 1954, 48 77597
    • Nazarov, I. N.; Zauyalou, S. I. Zh. Obshch. Khim. 1953, 23, 1703-1706. (Chem. Abs. 1954, 48, 77597).
    • (1953) Obshch. Khim. , vol.23 , pp. 1703-1706
    • Nazarov, I.N.1    Zh., I.Z.S.2
  • 59
    • 84055221276 scopus 로고    scopus 로고
    • Whether Deslongchamps annulations are Diels-Alder reactions or proceed by an inter- plus an intramolecular Michael addition has not been clarified
    • Whether Deslongchamps annulations are Diels-Alder reactions or proceed by an inter- plus an intramolecular Michael addition has not been clarified.
  • 63
  • 69
    • 84055180782 scopus 로고    scopus 로고
    • We developed this access because the condensation between the bis(enolate) of tert-butyl acetoacetate and diethyl chlorophosphonate32 provided 29 in unsatisfactory yields and with inseparable contaminants
    • We developed this access because the condensation between the bis(enolate) of tert-butyl acetoacetate and diethyl chlorophosphonate32 provided 29 in unsatisfactory yields and with inseparable contaminants.
  • 72
    • 84055180783 scopus 로고    scopus 로고
    • This was concluded from the virtual absence of extraresonances in the respective 1H(400MHz, CDCl3) and 13CNMRspectra (100 MHz, CDCl3). We assume that such spectra should have revealed the presence of another diastereomer if the latter represented more than 5% of the material
    • This was concluded from the virtual absence of extraresonances in the respective 1H(400MHz, CDCl3) and 13CNMRspectra (100 MHz, CDCl3). We assume that such spectra should have revealed the presence of another diastereomer if the latter represented more than 5% of the material.
  • 73
    • 84055180784 scopus 로고    scopus 로고
    • When the Nazarov reagent 15a was deprotonated by K2CO3 or n-BuLi in the presence of the benzoquinone monoketal 13 or before the latter was added, respectively, the Deslongchamps adduct 34a did not form at all
    • When the Nazarov reagent 15a was deprotonated by K2CO3 or n-BuLi in the presence of the benzoquinone monoketal 13 or before the latter was added, respectively, the Deslongchamps adduct 34a did not form at all.
  • 74
    • 84857795763 scopus 로고    scopus 로고
    • CCDC849007 (35a) 849008 (38a), and 849006 (38b) contain the crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via the link
    • CCDC849007 (35a), 849008 (38a), and 849006 (38b) contain the crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via the link www.ccdc.cam.ac.uk/data-request/cif
  • 75
    • 84857795764 scopus 로고    scopus 로고
    • This conclusion is not only based on a plausible analogy but also on circumstantial 1H NMR evidence. In CDCl3 solutions 8a-H is significantly deshielded (35a: δ = 3.40 ppm; 35b: δ = 3.43 ppm; 35c: δ=3.39 ppm; 35d: δ=4.05-4.10 ppm (includes deshielding effect of Rphenyl group); 37: δ=3.22 ppm) compared to 5-H (35a: δ=2.79 ppm; 35b: δ = 2.68 ppm; 35c: δ = 2.58 ppm; 35d: δ = 3.48 ppm (includes deshielding effect of R-phenyl group); 37: δ = 2.56-2.68 ppm). This indicates that 8a-H is cis-oriented and 4-H trans-oriented relative to the ester substituent at C-4a
    • This conclusion is not only based on a plausible analogy but also on circumstantial 1H NMR evidence. In CDCl3 solutions 8a-H is significantly deshielded (35a: δ = 3.40 ppm; 35b: δ = 3.43 ppm; 35c: δ=3.39 ppm; 35d: δ=4.05-4.10 ppm (includes deshielding effect of Rphenyl group); 37: δ=3.22 ppm) compared to 5-H (35a: δ=2.79 ppm; 35b: δ = 2.68 ppm; 35c: δ = 2.58 ppm; 35d: δ = 3.48 ppm (includes deshielding effect of R-phenyl group); 37: δ = 2.56-2.68 ppm). This indicates that 8a-H is cis-oriented and 4-H trans-oriented relative to the ester substituent at C-4a.


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