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Volumn 7, Issue 9, 2005, Pages 1679-1682

Highly regioselective diels-alder reactions toward oroidin alkaloids: Use of a tosylvinyl moiety as a nitrogen masking group with adjustable electronics

Author keywords

[No Author keywords available]

Indexed keywords

ALKALOID DERIVATIVE; NITROGEN; TOLUENE DERIVATIVE;

EID: 18844385988     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol0473602     Document Type: Article
Times cited : (53)

References (39)
  • 5
    • 0141742509 scopus 로고    scopus 로고
    • For a recent review of oroidin-derived alkaloids, see: Hoffmann, H.; Lindel, T. Synthesis 2003, 12, 1753.
    • (2003) Synthesis , vol.12 , pp. 1753
    • Hoffmann, H.1    Lindel, T.2
  • 19
    • 85081441567 scopus 로고    scopus 로고
    • note
    • This biosynthetic proposal was suggested by a reviewer of the manuscript by Kinnel and Scheuer (ref 5a).
  • 22
    • 85081440390 scopus 로고    scopus 로고
    • note
    • Difficulties in removing the benzyl group under mild conditions in similar substrates led to the use of the 3,4-dimethoxybenzyl group.
  • 23
    • 85081437091 scopus 로고    scopus 로고
    • See the Supporting Information for details
    • See the Supporting Information for details.
  • 24
    • 85081436012 scopus 로고    scopus 로고
    • see ref 9a
    • Lovely has observed related alkene isomers in similar Diels-Alder reactions employing vinyl imidazoles (see ref 9a).
  • 25
    • 85081437784 scopus 로고    scopus 로고
    • see ref 2a
    • Oxidation of the dibenzylated adduct 14 could be achieved in nearly quantitative yield with dimethyl dioxirane (see ref 2a).
  • 27
    • 85081434462 scopus 로고    scopus 로고
    • note
    • Since this 1,2-shift proceeds through an electron-poor, three-centered, two electron transition state, it appears that elimination processes leading to aromatized product 23 become competitive with the desired 1,2-shift.
  • 28
    • 85081438390 scopus 로고    scopus 로고
    • note
    • To the best of our knowledge, the use of the Tsv group as a protecting group has not been described in the literature.
  • 29
    • 0002877807 scopus 로고
    • The Tse group has had limited use; a partial reference list includes: (a) Faubl, H. Tetrahedron Lett. 1979, 491.
    • (1979) Tetrahedron Lett. , pp. 491
    • Faubl, H.1
  • 39
    • 85081441194 scopus 로고    scopus 로고
    • see the Supporting Information for details
    • 1 protection (see the Supporting Information for details). This diene provided a 2.5:1 ratio of Diels-Alder regioisomers, with the major product being the desired regioisomer.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.