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Volumn 121, Issue 10, 1999, Pages 2071-2084

Synthesis of the South unit of cephalostatin. 7. Total syntheses of (+)- cephalostatin 7, (+)-cephalostatin 12, and (+)-ritterazine K

Author keywords

[No Author keywords available]

Indexed keywords

CEPHALOSTATIN 12; CEPHALOSTATIN 7; PYRAZINE DERIVATIVE; RITTERAZINE K; UNCLASSIFIED DRUG;

EID: 0001678926     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9817141     Document Type: Article
Times cited : (68)

References (56)
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    • Cephalostatin Synthesis. 15. Portions of this work have been communicated in Articles 6 and 9 of this series: Jeong, J. U.; Fuchs, P. L. Tetrahedron Lett. 1995, 36, 2431. Jeong, J. U.; Sutton, S. C.; Kim, S.; Fuchs, P. L. J. Am. Chem. Soc. 1995, 117, 10157. For additional syntheses of cephalostatin-related pyrazines, see: (a) Pan, Y.; Merriman, R. L.; Tanzer, L. R.; Fuchs, P. L. Bioorg. Med. Chem. Lett. 1992, 2, 967. (b) Heathcock, C. H.; Smith, S. C. J. Org. Chem. 1994, 59, 6828. (c) Kramer, A.; Ullmann, U.; Winterfeldt, E. J. Chem. Soc., Perkin Trans. 1 1993, 2865. (d) Ganesan, A. Angew. Chem., Int. Ed. Engl. 1996, 35, 611. (e) Drogemuller, M.; Jantelat, R.; Winterfelt, E. Angew. Chem., Int. Ed. Engl. 1996, 35, 1572. (f) Guo, C.; Bhandaru, S.; Fuchs, P. L.; Boyd, M. R. J. Am. Chem. Soc. 1996, 118, 10672. (g) LaCour, T. G.; Guo, C.; Bhandaru, S.; Boyd, M. R.; Fuchs, P. L. J. Am. Chem. Soc. 1998, 120, 692. (h) Drögemüller, M.; Flessner, T.; Jaulelat, R.; Scholz, U.; Winterfeldt, E. Eur. J. Org. Chem. 1998, 2811.
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    • LaCour, T.G.1    Guo, C.2    Bhandaru, S.3    Boyd, M.R.4    Fuchs, P.L.5
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    • 2742596088 scopus 로고    scopus 로고
    • Cephalostatin Synthesis. 15. Portions of this work have been communicated in Articles 6 and 9 of this series: Jeong, J. U.; Fuchs, P. L. Tetrahedron Lett. 1995, 36, 2431. Jeong, J. U.; Sutton, S. C.; Kim, S.; Fuchs, P. L. J. Am. Chem. Soc. 1995, 117, 10157. For additional syntheses of cephalostatin-related pyrazines, see: (a) Pan, Y.; Merriman, R. L.; Tanzer, L. R.; Fuchs, P. L. Bioorg. Med. Chem. Lett. 1992, 2, 967. (b) Heathcock, C. H.; Smith, S. C. J. Org. Chem. 1994, 59, 6828. (c) Kramer, A.; Ullmann, U.; Winterfeldt, E. J. Chem. Soc., Perkin Trans. 1 1993, 2865. (d) Ganesan, A. Angew. Chem., Int. Ed. Engl. 1996, 35, 611. (e) Drogemuller, M.; Jantelat, R.; Winterfelt, E. Angew. Chem., Int. Ed. Engl. 1996, 35, 1572. (f) Guo, C.; Bhandaru, S.; Fuchs, P. L.; Boyd, M. R. J. Am. Chem. Soc. 1996, 118, 10672. (g) LaCour, T. G.; Guo, C.; Bhandaru, S.; Boyd, M. R.; Fuchs, P. L. J. Am. Chem. Soc. 1998, 120, 692. (h) Drögemüller, M.; Flessner, T.; Jaulelat, R.; Scholz, U.; Winterfeldt, E. Eur. J. Org. Chem. 1998, 2811.
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    • Drögemüller, M.1    Flessner, T.2    Jaulelat, R.3    Scholz, U.4    Winterfeldt, E.5
  • 20
    • 13044310489 scopus 로고    scopus 로고
    • note
    • More than 15 g of alcohol 4, the Stanyl allylation product from the pentacyclic aldehyde 2, was accumulated during synthesis of the North unit. For detail, see preceding paper.
  • 29
    • 0026758525 scopus 로고
    • 2O at reflux to provide 1,2-diol 29, which was converted to acetonide 30. Cleavage of the benzyl ether of 30 by hydrogenation followed by Swern oxidation of the resultant alcohol 31 provided aldehyde 32. Aldehyde 32 was converted to oxime 33, which was oxidized to the desired nitroacetonide 34 by using Petrini's protocol (see: Ballini, R.; Marcamoni, E.; Petrini, M. Tetrahedron Lett. 1992, 4835). For experimental procedure, see Supporting Information.
    • (1992) Tetrahedron Lett. , pp. 4835
    • Ballini, R.1    Marcamoni, E.2    Petrini, M.3
  • 34
    • 13044261824 scopus 로고    scopus 로고
    • note
    • Commercially available glycidol 52 was protected as MOM ether 53, followed by epoxide opening to give phenyl sulfide 54 (2 steps, 70%) and oxone oxidation to afford sulfone 56 (90%). In our initial attempt, oxidation of the hydroxyl in 56 was found to be problematic. For experimental procedure, see Supporting Information.
  • 44
    • 13044315632 scopus 로고    scopus 로고
    • note
    • X-ray structural information relating to compounds 76, S-75, and R-75 can be obtained from the Cambridge Crystallographic Data Centre.
  • 45
    • 13044309171 scopus 로고    scopus 로고
    • note
    • Calculations were performed using a Tektronix CAChe v3.5. For additional examples of using molecular mechanics for prediction of spiroketal thermodynamics, see ref 8.
  • 49
    • 13044298929 scopus 로고    scopus 로고
    • MM2 calculation was performed using CAChe v.3.7
    • MM2 calculation was performed using CAChe v.3.7.
  • 51
    • 13044302336 scopus 로고    scopus 로고
    • note
    • 20 methine proton was believed to be the slowest step in the proposed mechanism.
  • 55
    • 13044301501 scopus 로고    scopus 로고
    • note
    • We are extremely grateful to Professor G. R. Pettit and Dr. Jun-Ping Xu of Arizona State for comparisons of synthetic cephalostatins 7 (10) and 12 (9) with the natural materials.


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