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Volumn 3, Issue 4, 2014, Pages 412-415

Enantioselective organocatalyzed formal [4+2] cycloaddition of ketimines with allenoates: Easy access to a tetrahydropyridine framework with a chiral tetrasubstituted stereogenic carbon center

Author keywords

Allenoates; Ketimines; Organocatalysis; Tetrahydropyridines

Indexed keywords


EID: 84898930093     PISSN: 21935807     EISSN: 21935807     Source Type: Journal    
DOI: 10.1002/ajoc.201300244     Document Type: Article
Times cited : (54)

References (61)
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    • and references therein.
    • D. O'Hagan, Nat. Prod. Rep. 2000, 17, 435, and references therein.
    • (2000) Nat. Prod. Rep. , vol.17 , pp. 435
    • O'Hagan, D.1
  • 16
    • 84898964071 scopus 로고    scopus 로고
    • For selected reviews and reports on the phosphine catalyzed [n+2] cycloadditons, see:
    • For selected reviews and reports on the phosphine catalyzed [n+2] cycloadditons, see:
  • 28
    • 84898936191 scopus 로고    scopus 로고
    • For recent reviews and reports on the enantioselective preparation of chiral tetrasubstituted carbon centers, see:
    • For recent reviews and reports on the enantioselective preparation of chiral tetrasubstituted carbon centers, see:
  • 47
    • 84898961791 scopus 로고    scopus 로고
    • R) or (S)-SITCP is commercially available from Sigma-Aldrich and Strem.
    • (R) or (S)-SITCP is commercially available from Sigma-Aldrich and Strem.
  • 48
    • 84898982631 scopus 로고    scopus 로고
    • The groups of Fu, Zhou, and Shi independently used (S)-SITCP as a chiral nucleophilic organocatalyst, see:
    • The groups of Fu, Zhou, and Shi independently used (S)-SITCP as a chiral nucleophilic organocatalyst, see:
  • 58
    • 84898972210 scopus 로고    scopus 로고
    • The products 3a and 3a' were obtained in 88% total yield (3a:3a'=14.3:1) with 84% ee for 3a when using 10mol% catalyst loading.
    • The products 3a and 3a' were obtained in 88% total yield (3a:3a'=14.3:1) with 84% ee for 3a when using 10mol% catalyst loading.
  • 59
    • 84899021795 scopus 로고    scopus 로고
    • An addition of Brønsted acid such as 2-naphthol (20mol%) led to a drastic drop of reaction rate and stereoselectivity; after 24h, 50% total yield of products 3a and 3a' (3a:3a'=1:1.2) were obtained in 19% ee for 3a and 11% ee for 3a', respectively.
    • An addition of Brønsted acid such as 2-naphthol (20mol%) led to a drastic drop of reaction rate and stereoselectivity; after 24h, 50% total yield of products 3a and 3a' (3a:3a'=1:1.2) were obtained in 19% ee for 3a and 11% ee for 3a', respectively.
  • 60
    • 84898941878 scopus 로고    scopus 로고
    • CCDC964567 ((R)-3c) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from the Cambridge Crystallographic Data Centre via.
    • CCDC964567 ((R)-3c) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from the Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.
  • 61
    • 84898996858 scopus 로고    scopus 로고
    • The absolute configuration of major products 3a-b and 3d-k were tentatively assigned to be the structures as shown in Scheme2 by comparison with an optical rotation of (-)-3c (91% ee, R)), see the Supporting Information.
    • The absolute configuration of major products 3a-b and 3d-k were tentatively assigned to be the structures as shown in Scheme2 by comparison with an optical rotation of (-)-3c (91% ee, (R)), see the Supporting Information.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.