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Volumn , Issue 9, 1998, Pages 1955-1963

Highly stereoselective trans addition of π-type nucleophiles to a bicyclic N-acyliminium ion - Application to the synthesis of indolizidine and pyrrolizidine alkaloids

Author keywords

Indolizidine; N acyliminium; Pyrrolidine; Pyrrolizidine; Stereoselective

Indexed keywords


EID: 0002543115     PISSN: 1434193X     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1099-0690(199809)1998:9<1955::AID-EJOC1955>3.0.CO;2-U     Document Type: Article
Times cited : (55)

References (43)
  • 6
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    • and references cited herein
    • [3d] J. K. Whitesell, Chem. Rev. 1989, 89, 1581-1590 and references cited herein.
    • (1989) Chem. Rev. , vol.89 , pp. 1581-1590
    • Whitesell, J.K.1
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    • 2842588853 scopus 로고    scopus 로고
    • note
    • [8]
  • 27
    • 2842540027 scopus 로고    scopus 로고
    • note
    • 3, PPTS, MeOH] followed by cyclisation, resulted in a poor overall yield of 1a (25%).
  • 28
    • 2842556686 scopus 로고    scopus 로고
    • note
    • 2Me), followed by a three-step procedure leading to the required bicyclic oxazolidmone.
  • 30
    • 2842551128 scopus 로고    scopus 로고
    • note
    • The geometries of the initial states were optimised by using the Davidson-Fletcher-Powell algorithm (FLEPO procedure), minimising the energy with respect to all internal coordinates. Approximate transition states were obtained from the energy profiles in a reaction path (the reaction coordinates being the distance between the carbon atom of C=N and the reactive terminal carbon atom of the allylsilane), then the transition states were optimised by minimising the energy gradient (NLLSQ procedure).
  • 36
    • 2842607804 scopus 로고    scopus 로고
    • note
    • [24c] The optical rotation of naturally occuring sample of xenovenine has not been determined so far because of its scarcity.
  • 40
    • 2842594457 scopus 로고    scopus 로고
    • note
    • Compound 1a was equally prepared by refluxing 5 in MeOH in 39% yield. The spectral data of 1'a were deduced by difference with those of 1a.
  • 43
    • 2842593355 scopus 로고    scopus 로고
    • note
    • Crystallographic data (excluding structure factors) for the structures reported in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication no CCDC-101210. Copies of the data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB2 1EZ. UK [fax: int. code + 44-(1223)336-033, e-mail: deposit@ccdc.cam.ac.uk].


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.