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Volumn 13, Issue 18, 2007, Pages 5060-5074

The total synthesis and biological properties of the cytotoxic macrolide FD-891 and its non-natural (Z)-C12 isomer

Author keywords

Aldol reaction; Allylation; Antitumor agents; Lactones; Olefination; Tubulin binding

Indexed keywords

ALDOL REACTION; ANTITUMOR AGENTS; MACROLACTONE RING; TUBULIN BINDING;

EID: 34250893238     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200700342     Document Type: Article
Times cited : (20)

References (80)
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    • Eds, B. M. Trost, I. Fleming, E. Winterfeldt, Pergamon Press, Oxford
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    • However, we have prepared 10 via an adaptation of one route described for the TBS analogue: S. Chandrasekhar, C. R. Reddy, Tetrahedron: Asymmetry 2002, 13, 261 -268.
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    • 3). Therefore, we resorted to the alternative method described in Scheme 3.
    • 3). Therefore, we resorted to the alternative method described in Scheme 3.
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    • 2AlCl, we tested reductants such as DIBAL and L-selectride, which have proven useful in closely related instances (D. L. Boger, T. T. Curran, J. Org. Chem. 1992, 57, 2235-2244). However, they displayed a low stereoselectivity in the present case (dr = about 2:1).
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    • The configuration of the stereocentre created in this step was established by total desilylation of 17 with TBAF and treatment of the resulting tetraol with 2,2-dimethoxypropane and an acid catalyst. This gave a monoacetonide I which showed two methyl 13C NMR spec troscopic signals at approximately 30 and 19ppm. This indicates that it is the acetonide of a syn-1,3-diol [20] and can only be that indicated below, as the internal acetonide would necessarily be anti
    • 13C NMR spec troscopic signals at approximately 30 and 19ppm. This indicates that it is the acetonide of a syn-1,3-diol [20] and can only be that indicated below, as the internal acetonide would necessarily be anti.
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    • For the synthesis of a compound structurally related to fragment 23 see
    • For the synthesis of a compound structurally related to fragment 23 see: S.-S. Chng, J. Xu, T.-P. Loh, Tetrahedron Lett. 2003, 44, 4997-5000.
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    • For a preliminary communication see:, Several improvements and optimisations with respect to the published synthesis are reported now
    • For a preliminary communication see: J. Murga, J. García-Fortanet, M. Carda, J. A. Marco, Synlett 2004, 2830-2832. Several improvements and optimisations with respect to the published synthesis are reported now.
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    • This Z→E isomerisation during the oxidation with PCC has been reported to occur with the corresponding benzyl derivative: S. J. Danishefsky, E. M. Berman, M. Ciufolini, S. J. Etheredge, B. E. Segmuller, J. Am. Chem. Soc. 1985, 107, 3891-3898
    • This Z→E isomerisation during the oxidation with PCC has been reported to occur with the corresponding benzyl derivative: S. J. Danishefsky, E. M. Berman, M. Ciufolini, S. J. Etheredge, B. E. Segmuller, J. Am. Chem. Soc. 1985, 107, 3891-3898.
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    • This olefination gave a better yield in 1,2-dichloroethane at 60°C than in toluene at 110°C, in contrast to that observed in a structurally similar situation: J. A. Marshall, N. D. Adams, J. Org. Chem. 2002, 67, 733-740
    • This olefination gave a better yield in 1,2-dichloroethane at 60°C than in toluene at 110°C, in contrast to that observed in a structurally similar situation: J. A. Marshall, N. D. Adams, J. Org. Chem. 2002, 67, 733-740.
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    • This change of the chiral auxiliary was motivated by the saving of one step, as we were able to directly reduce the silylated aldol adducts to aldehydes, thus circumventing the preparation of Weinreb amides. Furthermore, the first reduction-olefination sequence worked much better with the Oppolzer auxiliary (38→35, 88% overall yield) than via the Weinreb amide 34-35, 55% overall yield
    • This change of the chiral auxiliary was motivated by the saving of one step, as we were able to directly reduce the silylated aldol adducts to aldehydes, thus circumventing the preparation of Weinreb amides. Furthermore, the first reduction-olefination sequence worked much better with the Oppolzer auxiliary (38→35, 88% overall yield) than via the Weinreb amide (34-35, 55% overall yield).
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    • Preliminary report on the total synthesis of FD-891 : J. García-Fortanct, J. Murga, M. Carda, J. A. Marco, Org. Lett. 2006, 8, 2695-2698;
    • a) Preliminary report on the total synthesis of FD-891 : J. García-Fortanct, J. Murga, M. Carda, J. A. Marco, Org. Lett. 2006, 8, 2695-2698;
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    • for another recently published synthesis of FD-891 see: M. T. Crimmins, F. Caussanel, J. Am. Chem. Soc. 2006, 128, 3128-3129.
    • h) for another recently published synthesis of FD-891 see: M. T. Crimmins, F. Caussanel, J. Am. Chem. Soc. 2006, 128, 3128-3129.
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    • The absolute configuration of aldol 51 has been secured by means of X-ray diffraction analysis (see the Supporting Information in reference [36a]).
    • The absolute configuration of aldol 51 has been secured by means of X-ray diffraction analysis (see the Supporting Information in reference [36a]).
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    • Silylation of 51 required the use of a considerable excess of silylating agent. Therefore, purification of 52 proved difficult. For this reason, overall yield is given for the three steps 51→54.
    • Silylation of 51 required the use of a considerable excess of silylating agent. Therefore, purification of 52 proved difficult. For this reason, overall yield is given for the three steps 51→54.
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    • Under the standard conditions for the Julia-Kocienski reaction (KHMDS, THF), we obtained an 80:20 E/Z mixture but in only 23% yield, even when using a fourfold excess of aldehyde 23. No improvement in yield or stereoselectivity could be achieved.
    • Under the standard conditions for the Julia-Kocienski reaction (KHMDS, THF), we obtained an 80:20 E/Z mixture but in only 23% yield, even when using a fourfold excess of aldehyde 23. No improvement in yield or stereoselectivity could be achieved.
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    • The assignments of configuration to the newly formed olefinic bond in each isomer was difficult because of strong signal overlapping. The problem could be finally solved by NMR spectroscopic measurements at very high field 800 MHz, see acknowledgments
    • The assignments of configuration to the newly formed olefinic bond in each isomer was difficult because of strong signal overlapping. The problem could be finally solved by NMR spectroscopic measurements at very high field (800 MHz, see acknowledgments).
  • 71
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    • The identity of the final desilylation product 2 was confirmed through comparison with an authentic sample of the natural product (see the Acknowledgements).
    • The identity of the final desilylation product 2 was confirmed through comparison with an authentic sample of the natural product (see the Acknowledgements).
  • 72
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    • Cleavage of the silyl groups at C-7 and C-10 takes place with ease. In contrast, those allocated at C-21 and C-23 proved unexpectedly reluctant to cleavage under various mild conditions (too harsh conditions caused decomposition). These two groups are thus responsible for the unsatisfactory yield in the final desilylation step. Such problematic deprotections are not unprecedented: T. B. Durham, N. Blanchard, B. M. Savall, N. A. Powell, W. R. Roush, J. Am. Chem. Soc. 2004, 126, 9307-9317.
    • Cleavage of the silyl groups at C-7 and C-10 takes place with ease. In contrast, those allocated at C-21 and C-23 proved unexpectedly reluctant to cleavage under various mild conditions (too harsh conditions caused decomposition). These two groups are thus responsible for the unsatisfactory yield in the final desilylation step. Such problematic deprotections are not unprecedented: T. B. Durham, N. Blanchard, B. M. Savall, N. A. Powell, W. R. Roush, J. Am. Chem. Soc. 2004, 126, 9307-9317.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.