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Volumn 128, Issue 28, 2006, Pages 9194-9204

Total syntheses of amphidinolide X and Y

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSIS; CATALYSTS; IRON; METABOLITES; REACTION KINETICS; SYNTHESIS (CHEMICAL);

EID: 33746066374     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja061918e     Document Type: Article
Times cited : (157)

References (154)
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    • note
    • 50 values as low as 0.00014 μg/mL were reported: hence, amphidinolides H and N exhibit potencies similar to that of the spongistatins, cf. ref 1.
  • 11
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    • For a recent review on macrodiolides see: Kang, E. J.; Lee, E. Chem. Rev. 2005, 105, 4348.
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    • Kang, E.J.1    Lee, E.2
  • 29
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    • For total syntheses of amphidinolides reported by other groups, see: (a) Williams, D. R.; Kissel, W. S. J. Am. Chem. Soc. 1998, 120, 11198.
    • (1998) J. Am. Chem. Soc. , vol.120 , pp. 11198
    • Williams, D.R.1    Kissel, W.S.2
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    • 0038542691 scopus 로고    scopus 로고
    • For a discussion see: Fürstner, A. Synlett 1999, 1523.
    • (1999) Synlett , pp. 1523
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  • 69
    • 33746038271 scopus 로고    scopus 로고
    • note
    • Originally, it had been envisaged to install the missing -OH group at C. 17 via hydroboration/oxidation or, alternatively, by a Wacker oxidation of the olefin in 19 followed by reduction of the resulting ketone; however, both sequences turned out to be unsatisfactory.
  • 71
    • 33744499702 scopus 로고    scopus 로고
    • For a recent alternative synthesis of a D-synthon surrogate see: Chen, Y.; Jin, J.; Wu, J.; Dai, W.-M., Synlett 2006, 1177.
    • (2006) Synlett , pp. 1177
    • Chen, Y.1    Jin, J.2    Wu, J.3    Dai, W.-M.4
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    • note
    • Toluene should not be used as substitute for benzene in the acetalization reaction because the separation of the volatile product is then much more difficult and results in significantly lower yields.
  • 73
    • 0035073820 scopus 로고    scopus 로고
    • The literature reports that this Dibal-H reduction affords the corresponding alcohol, cf: Langer, P.; Freifeld, I. Synlett 2001, 523; in our hands, however, the reduction reproducibly stopped at the aldehyde stage even if an excess Dibal-H was used.
    • (2001) Synlett , pp. 523
    • Langer, P.1    Freifeld, I.2
  • 81
    • 33746101216 scopus 로고    scopus 로고
    • note
    • 3 once the color of iodine starts to persist in order to ensure high and reproducible yields, cf. Supporting Information.
  • 87
    • 33746094020 scopus 로고    scopus 로고
    • note
    • Such a transformation could be achieved via zinc insertion into the C-X bond in the AD fragment followed by Negishi cross coupling. Exploratory studies, however, invariably resulted in low yields and were abandoned in favor of the Suzuki route.
  • 98
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    • For general reviews on the Suzuki reaction see, inter alia: (a) Suzuki, A. J. Organomet. Chem. 1999, 576, 147.
    • (1999) J. Organomet. Chem. , vol.576 , pp. 147
    • Suzuki, A.1
  • 105
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    • (c) For early applications of the alkyl-Suzuki reaction from this laboratory, see: Fürstner, A.; Konetzki, I. J. Org. Chem. 1998, 63, 3072.
    • (1998) J. Org. Chem. , vol.63 , pp. 3072
    • Fürstner, A.1    Konetzki, I.2
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    • Jacobsen, E. N., Pfaltz, A., Yamamoto, H., Eds.; Springer: Berlin
    • (b) Ohkuma, T.; Noyori, R. In Comprehensive Asymmetric Catalysis; Jacobsen, E. N., Pfaltz, A., Yamamoto, H., Eds.; Springer: Berlin. 1999; Vol. 1; pp 199-246.
    • (1999) Comprehensive Asymmetric Catalysis , vol.1 , pp. 199-246
    • Ohkuma, T.1    Noyori, R.2
  • 133
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    • The catalyst was prepared as described in: King, S. A.; Keller, J. Org. Synth. 2005, 81, 178.
    • (2005) Org. Synth. , vol.81 , pp. 178
    • King, S.A.1    Keller, J.2
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    • For precedence on the diastereoselective hydrogenation of a chiral α-ketoester see: Gao, Y.; Lane-Bell, P.; Vederas, J. C. J. Org. Chem. 1998, 63, 2133.
    • (1998) J. Org. Chem. , vol.63 , pp. 2133
    • Gao, Y.1    Lane-Bell, P.2    Vederas, J.C.3
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    • (a) Evans, D. A.; Carter, P. H.; Carreira, E. M.; Charette, A. B.; Prunet, J. A.; Lautens, M. J. Am. Chem. Soc. 1999, 121, 7540. To the best of our knowledge, this is the only report showing 1.4-induction by α-alkoxy substitutents in methyl ketones without any superimposed 1,5-induction and/or directing effects exerted by substituents in the aldehyde component.
    • (1999) J. Am. Chem. Soc. , vol.121 , pp. 7540
    • Evans, D.A.1    Carter, P.H.2    Carreira, E.M.3    Charette, A.B.4    Prunet, J.A.5    Lautens, M.6
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    • For pertinent discussions on the related 1.5-induction observed in reactions of β-alkoxy substituted methyl ketone enolates with (chiral) aldehydes see the following for leading references: (a) Gustin, D. J.; VanNieuwenhze, M. S.; Roush, W. R. Tetrahedron Lett. 1995, 36, 3443.
    • (1995) Tetrahedron Lett. , vol.36 , pp. 3443
    • Gustin, D.J.1    Vannieuwenhze, M.S.2    Roush, W.R.3
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    • note
    • Note that this spontaneous cyclization provides further evidence for the cis-orientation of the alkyl group at the anomeric center and the tertiary alcohol group generated through chelate-Cram addition.
  • 153
    • 0042233762 scopus 로고    scopus 로고
    • + salts formed as byproducts in the generation of the mixed anhydride are filtered off prior to concentration of the solution and subsequent macrocyclization. This protocol is highly advisable for very acid-sensitive compounds, cf: Evans, D. A.; Connell, B. T. J. Am. Chem. Soc. 2003, 125, 10899.
    • (2003) J. Am. Chem. Soc. , vol.125 , pp. 10899
    • Evans, D.A.1    Connell, B.T.2
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    • note
    • Unprotected samples of the crude seco-acid were obtained by lowering the pH during the extractive work to <5.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.