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Volumn 74, Issue 4, 2009, Pages 1587-1597

Synthetic studies toward sordarin: Building blocks for the terpenoid core and for analogues thereof

Author keywords

[No Author keywords available]

Indexed keywords

BUILDING BLOCKS; CYCLOPENTADIENES; INTRAMOLECULAR DIELS-ALDER REACTIONS; SORDARICIN; SYNTHETIC STUDIES; TARGET MOLECULES; TERPENOID;

EID: 64349097111     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo801911s     Document Type: Article
Times cited : (21)

References (85)
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    • and references cited thereinRecent review
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    • Cf (a) Bueno, J. M.; Chicharro, J.; Fiandor, J. M.; Gomez de las Heras, F.; Huss, S. Bioorg. Med. Chem. Lett. 2002, 12, 1697.
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    • Interest in such compounds was motivated by the results described in ref
    • Interest in such compounds was motivated by the results described in ref.
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    • The Kato (ref 5a) and Mander (ref 5b) total syntheses of 1 indeed rely on IMDA routes to the terpenoid nucleus.
    • The Kato (ref 5a) and Mander (ref 5b) total syntheses of 1 indeed rely on IMDA routes to the terpenoid nucleus.
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    • TMS and TES silyl ethers underwent desilylation back to the starting enones upon heating in the presence of dienophiles
    • TMS and TES silyl ethers underwent desilylation back to the starting enones upon heating in the presence of dienophiles.
  • 32
    • 64349094925 scopus 로고    scopus 로고
    • An MNDO calculation (Hyperchem package) indicated that the LUMO energy of 2-chloroacrylonitrile is about 0.5 eV lower than that of acrylonitrile or acrolein
    • An MNDO calculation (Hyperchem package) indicated that the LUMO energy of 2-chloroacrylonitrile is about 0.5 eV lower than that of acrylonitrile or acrolein.
  • 33
    • 64349123990 scopus 로고    scopus 로고
    • Adducts 22 and 24 were not fully characterized. For the series of compounds emanating from 22, full characterization occurred at the stage of derivative 28.
    • Adducts 22 and 24 were not fully characterized. For the series of compounds emanating from 22, full characterization occurred at the stage of derivative 28.
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    • This would be consequence of the electronic similarity between the cyclopentadienes in question and the Danishefsky diene ref 11
    • This would be consequence of the electronic similarity between the cyclopentadienes in question and the Danishefsky diene (ref 11).
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    • 1H NMR. In crude form, it was directly advanced to 32, which was purified and fully characterized.
    • 1H NMR. In crude form, it was directly advanced to 32, which was purified and fully characterized.
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    • As anticipated based on the behavior of the sterically similar camphor: Brown, H. C.; Muzzio, J. J. Am. Chem. Soc. 1966, 88, 2811.
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    • Because of this disappointing outcome, compounds 47 and 48 were not purified to homogeneity or fully characterized.
    • Because of this disappointing outcome, compounds 47 and 48 were not purified to homogeneity or fully characterized.
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    • This reaction furnished instead ketal 51, which was not thoroughly characterized
    • This reaction furnished instead ketal 51, which was not thoroughly characterized:
  • 48
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    • Because of this failure, compound 54 was not purified to homogeneity or fully characterized.
    • Because of this failure, compound 54 was not purified to homogeneity or fully characterized.
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    • Reviews: (a) Ciganek, E. Org. React. 1997, 51, 201.
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    • Ciganek, E.1
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    • ex = 13.1 Hz).
    • ex = 13.1 Hz).
  • 62
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    • Protection of 77 as, e.g., a TES ether furnished intermediates that reacted poorly in subsequent steps.
    • Protection of 77 as, e.g., a TES ether furnished intermediates that reacted poorly in subsequent steps.
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    • The cyclopentadiene unit in 86 lacks an oxygen substituent that might direct formation of the correct regioisomer of the adduct. However, 56 produces 57 only (Scheme 11 and ref 5c, More significantly, 2, 4-pentadienoic acid reacts with acrylic acid to give a cycloadduct that displays vicinal COOH groups Davalian, D, Garratt, P, Koller, W, Mansuri, M. J. Org. Chem. 1980, 45, 4183, Thus, we anticipated good regioselectivity in the IMDA cyclization of 86
    • The cyclopentadiene unit in 86 lacks an oxygen substituent that might direct formation of the correct regioisomer of the adduct. However, 56 produces 57 only (Scheme 11 and ref 5c). More significantly, 2, 4-pentadienoic acid reacts with acrylic acid to give a cycloadduct that displays vicinal COOH groups (Davalian, D.; Garratt, P.; Koller, W.; Mansuri, M. J. Org. Chem. 1980, 45, 4183). Thus, we anticipated good regioselectivity in the IMDA cyclization of 86.
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    • Numerical results are provided as Supporting Information
    • Numerical results are provided as Supporting Information.
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    • Over a range of temperatures, compound 84 was immune to the action of trialkylsilyl halides/tertiary amines in the presence of Lewis acids) Danishefsky, S.; Kitahara, T. J. Am. Chem. Soc. 1974, 96, 7807), trialkylsilyl triflates (Review: Bach, T.; Brummerhop, H. J. Prak. Chem. 1999, 341, 410), bis(trimethylsilyl) acetamide (Cameron, D. W.; Feutrill, G. I.; Perlmutter, P. Tetrahedron Lett. 1981, 22, 3273), bis(trimethylsilyl) trifluoroacetamide ( Fattori, D.; de Gucht-eneere, E.; Vogel, P. Tetrahedron Lett. 1989, 30, 7415), or TMSI/HMDS Miller, R. D.; McKean, D. R. Synthesis 1979, 73.
    • Over a range of temperatures, compound 84 was immune to the action of trialkylsilyl halides/tertiary amines in the presence of Lewis acids) Danishefsky, S.; Kitahara, T. J. Am. Chem. Soc. 1974, 96, 7807), trialkylsilyl triflates (Review: Bach, T.; Brummerhop, H. J. Prak. Chem. 1999, 341, 410), bis(trimethylsilyl) acetamide (Cameron, D. W.; Feutrill, G. I.; Perlmutter, P. Tetrahedron Lett. 1981, 22, 3273), bis(trimethylsilyl) trifluoroacetamide ( Fattori, D.; de Gucht-eneere, E.; Vogel, P. Tetrahedron Lett. 1989, 30, 7415), or TMSI/HMDS ( Miller, R. D.; McKean, D. R. Synthesis 1979, 73.
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    • A significant excess of Li-base was essential in the present case, even though excess base may actually inhibit enolization, at least in the case of esters: Sun, X.; Collum, D. B. J. Am. Chem. Soc. 2000, 122, 2452.
    • A significant excess of Li-base was essential in the present case, even though excess base may actually inhibit enolization, at least in the case of esters: Sun, X.; Collum, D. B. J. Am. Chem. Soc. 2000, 122, 2452.
  • 84
    • 64349108229 scopus 로고    scopus 로고
    • The corresponding TMS enol ether was too labile, while the TES enol ether afforded poor yields in the subsequent IMDA
    • The corresponding TMS enol ether was too labile, while the TES enol ether afforded poor yields in the subsequent IMDA.
  • 85
    • 64349119012 scopus 로고    scopus 로고
    • 3 solutions and IR spectra were obtained from thin films deposited on NaCl plates. More detailed experimental protocols are provided as Supporting Information.
    • 3 solutions and IR spectra were obtained from thin films deposited on NaCl plates. More detailed experimental protocols are provided as Supporting Information.


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