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Volumn 119, Issue 43, 1997, Pages 10302-10316

Applications of Zr-catalyzed carbomagnesation and Mo-catalyzed macrocyclic ring closing metathesis in asymmetric synthesis, enantioselective total synthesis of Sch 38516 (fluvirucin B 1)

Author keywords

[No Author keywords available]

Indexed keywords

ANTIFUNGAL AGENT; FLUVIRUCIN B1; SCH 38516; UNCLASSIFIED DRUG;

EID: 0030700685     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja972191k     Document Type: Article
Times cited : (140)

References (106)
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    • Recent elegant studies by Grubbs on the effect of stereochemistry on the synthesis of macrocyclic peptides (disubstituted alkenes) by ring closing metathesis were not disclosed at the time of our planning. See: (a) Miller, S. J.; Gubbs, R. H. J. Am. Chem. Soc. 1995, 117, 5855-5856. (b) Miller, S. J.; Blackwell, H.; Grubbs, R. H. J. Am. Chem. Soc. 1996, 118, 9606-9614.
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    • For an unusually facile eight-membered ring synthesis through catalytic metathesis, see: (a) Visser, M. S.; Heron, N. M.; Didiuk, M. T.; Sagal, J. F.; Hoveyda, A. H. J. Am. Chem. Soc. 1996, 118, 4291-4298. For a more recent related study, see: (b) Linderman, R. J.; Siedlecki, J.; O'Neill, S. A.; Sun, H. J. Am. Chem. Soc. 1997, 119, 6919-6920.
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    • For an unusually facile eight-membered ring synthesis through catalytic metathesis, see: (a) Visser, M. S.; Heron, N. M.; Didiuk, M. T.; Sagal, J. F.; Hoveyda, A. H. J. Am. Chem. Soc. 1996, 118, 4291-4298. For a more recent related study, see: (b) Linderman, R. J.; Siedlecki, J.; O'Neill, S. A.; Sun, H. J. Am. Chem. Soc. 1997, 119, 6919-6920.
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    • note
    • Direct ozonolytic cleavage of protected 43 affords 45 in 40% isolated yield (versus 64% for the two-step sequence shown in Scheme 10).
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    • For the use of this chiral auxiliary in stereoselective reactions with O-silylketene acetals, see ref 36d.
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    • 2, Raney Ni, MeOH (14 h) afforded a complex mixture of unidentifiable products.
  • 83
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    • note
    • Several additional issues in connection to the transformation depicted in Scheme 16 merit comment: (1) In the formation of the intermediate methoxyacetal, the initial product consists of a 3:1 mixture of α:β isomers (after 8 h); however, after prolonged reaction times (70 h), the a anomer becomes the sole product. (2) Whereas formation of the above mentioned α-methylacetal requires 70 h, that of daunosamine (lacking the C2 axial OH) is complete within 30 min. This rate difference may be due to destabilization of the intermediate oxonium ion by the axially disposed hydroxide.
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    • note
    • 2O used was freshly distilled, it is tenable that HF contamination gives rise to the observed intramolecular etherification.
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    • note
    • Diene carbinol 62 may also be prepared by direct coupling of the amine derived from 22 (cf. Scheme 4) with carboxylic acid 18 (cf. Scheme 6). However, this procedure is significantly lower yielding than reaction with silylated derivative 17 (85% vs 55-60%). The difference in efficiency likely arises from difficulties in the purification of 22 prior to the coupling procedure.
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    • More recent accounts from the laboratories of Grubbs and Sauvage indicate that the metathesis technology may be readily applied to the synthesis of marcocyclic crown ethers and [2]catenanes. See: (a) Marsella, M. J.; Maynard, H. D.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1997, 36, 1101-1103.
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    • note
    • General experimental information for select reagents and compounds not involved in the final synthesis route and copies of spectral data for all synthetic intermediates can be found in the Supporting Information section.
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    • note
    • 3N.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.