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Volumn 70, Issue , 2006, Pages 367-388

Cycloaddition reactions of amino-acid derived cross-conjugated trienes: Stereoselective synthesis of novel heterocyclic scaffolds

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EID: 33947623746     PISSN: 03855414     EISSN: None     Source Type: Journal    
DOI: 10.3987/com-06-s(w)36     Document Type: Article
Times cited : (21)

References (52)
  • 23
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    • For example, Fallis' methodology was applied by Schreiber and coworkers to the diversity-oriented synthesis of a library of polycyclic small molecules:. For other applications of heteroatom containing cross-conjugated trienes, see
    • For example, Fallis' methodology was applied by Schreiber and coworkers to the diversity-oriented synthesis of a library of polycyclic small molecules:. Kwon O., Park S.B., and Schreiber S.L. For other applications of heteroatom containing cross-conjugated trienes, see. J. Am. Chem. Soc. 124 (2002) 13402
    • (2002) J. Am. Chem. Soc. , vol.124 , pp. 13402
    • Kwon, O.1    Park, S.B.2    Schreiber, S.L.3
  • 26
    • 33947697969 scopus 로고    scopus 로고
    • K. M. Brummond, T. O. Painter, D. A. Probst, B. Mitasev, "Rh(l)-Catalyzed Allenic Carbocyclization Reaction Affording 6- and c-Lactams"" Submitted for publication.
  • 27
    • 33947661535 scopus 로고    scopus 로고
    • note
    • The structure of 22a was assigned based on an X-ray of a later intermediate, Diels-Alder product (23a).
  • 28
    • 33947704245 scopus 로고    scopus 로고
    • note
    • Best yields were obtained when all three reactions were performed without intermediate purification. See experimental section for details.
  • 29
    • 0013610070 scopus 로고    scopus 로고
    • For the unexpected formation of a similar oxazolidinone
    • For the unexpected formation of a similar oxazolidinone. Granier T., and Vasella A. Helv. Chim. Acta. 81 (1998) 865
    • (1998) Helv. Chim. Acta. , vol.81 , pp. 865
    • Granier, T.1    Vasella, A.2
  • 30
    • 33947641166 scopus 로고    scopus 로고
    • note
    • Reactions were run until all starting material was consumed. No byproducts were isolated.
  • 31
    • 33947641679 scopus 로고    scopus 로고
    • note
    • Reaction was also not observed with the following dienophiles: 2-cyclohexene, 2-cyclopentene, acrolein and methyl-vinyl ketone.
  • 35
    • 33845552460 scopus 로고
    • 3 to catalyze hetero Diels-Alder reactions, see
    • 3 to catalyze hetero Diels-Alder reactions, see. Bednarski M., and Danishefsky S. J. Am. Chem. Soc. 105 (1983) 3716
    • (1983) J. Am. Chem. Soc. , vol.105 , pp. 3716
    • Bednarski, M.1    Danishefsky, S.2
  • 42
    • 33751158290 scopus 로고
    • For Ag(l)-catalyzed cycization of allenic acids, see
    • For Ag(l)-catalyzed cycization of allenic acids, see. Marshall J.A., Wolf M.A., and Wallace E.M. J. Org. Chem. 59 (1994) 7169
    • (1994) J. Org. Chem. , vol.59 , pp. 7169
    • Marshall, J.A.1    Wolf, M.A.2    Wallace, E.M.3
  • 45
    • 33947661534 scopus 로고    scopus 로고
    • note
    • Recently, a comprehensive study examined the effects contributing to the observed stereochemistry for thermal and Lewis acid catalyzed reactions of relatively unfunctionalized hexadienyl-acrylates. (a) E. L. Pearson, L. C. H. Kwan, C. I. Turner, G. A. Jones, A. C. Willis, M. N. Paddon-Row, and M. S. Sherburn, J. Org. Chem., 2006, 71, 6099. In general, difficulties associated with Diels-Alder reactions of ester-tethered substrates are attributed to existence of the ester moiety in an unfavorable transoid conformation in order to minimize repulsive dipole interactions. For a successful Diels-Alder reaction, the ester needs to rotate into a less favorable cisoid conformation that results in increase of the net dipole moment and steric repulsion between the two alkyl groups. (b) P. Deslongchamps, Stereoelectronic Effects in Organic Chemistry; Pergamon: Oxford, 1983; 54-100. Earlier studies have unveiled a dramatic solvent effect on the ester tethered Diels-Alder reaction. (c) M. E. Jung and J. Gervay, J. Am. Chem. Soc., 1989, 111, 5469.
  • 50
    • 33947636191 scopus 로고    scopus 로고
    • note
    • Highest yield (50%) of the tricyclic lactone (34) was obtained when the reaction was performed at lower concentrations (0.01M), suggesting that side reactions may be responsible for the low yield (mass spectral analysis of the reaction mixture suggested the presence of dimeric products possibly arising from a Diels-Alder reaction of the more reactive diene in the product with an acrylic ester moiety from a molecule of unreacted starting material). Personal communication from Dr. Stefan Werner.


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