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Volumn 67, Issue 19, 2011, Pages 3337-3342

Bifunctional cinchona alkaloids-catalyzed asymmetric [4+2] cycloaddition reaction of β,γ-unsaturated α-keto esters with oxazolones

Author keywords

, Unsaturated keto esters; 4+2 Cycloaddition; Asymmetric catalysis; Bifunctional catalysts

Indexed keywords

CINCHONA ALKALOID; ESTER DERIVATIVE; LACTONE DERIVATIVE; OXAZOLONE;

EID: 79954992355     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tet.2011.03.069     Document Type: Article
Times cited : (27)

References (79)
  • 6
    • 79955013165 scopus 로고    scopus 로고
    • Organocatalyzed reactions of β,γ-unsaturated α-keto esters reported by our group, see
    • Organocatalyzed reactions of β,γ-unsaturated α-keto esters reported by our group, see:
  • 14
    • 79955015099 scopus 로고    scopus 로고
    • Organocatalyzed reactions of β,γ-unsaturated α-keto esters reported by other group, see Refs. 3-7
    • Organocatalyzed reactions of β,γ-unsaturated α-keto esters reported by other group, see Refs. 3-7.
  • 15
    • 79955023500 scopus 로고    scopus 로고
    • Diels-Alder and hetero-Diels-Alder reactions
    • Diels-Alder and hetero-Diels-Alder reactions:
  • 32
    • 79954987279 scopus 로고    scopus 로고
    • Friedel-Crafts reaction
    • Friedel-Crafts reaction:
  • 40
    • 79955019569 scopus 로고    scopus 로고
    • Michael additions and oxa-Michael additions
    • Michael additions and oxa-Michael additions:
  • 50
    • 79955044540 scopus 로고    scopus 로고
    • Hydrogenations
    • Hydrogenations:
  • 54
    • 79954989704 scopus 로고    scopus 로고
    • For reviews, see
    • For reviews, see:
  • 77
    • 79551486283 scopus 로고    scopus 로고
    • During the preparation of this paper, Terada also reported the reaction between β,γ-unsaturated α-keto esters and for oxazolones using axially chiral guanidine catalysts. Their system requires a low reaction temperature (-60 °C) and enantioselectivities for most substrates do not exceed 90% ee:
    • During the preparation of this paper, Terada also reported the reaction between β,γ-unsaturated α-keto esters and for oxazolones using axially chiral guanidine catalysts. Their system requires a low reaction temperature (-60 °C) and enantioselectivities for most substrates do not exceed 90% ee: Chem. - Eur. J. 2011, 17, 1760.
    • (2011) Chem. - Eur. J. , vol.17 , pp. 1760
  • 78
    • 79955004443 scopus 로고    scopus 로고
    • note
    • -3. CCDC 806009 contains the supplementary crystallographic data for 3p. These data can be obtained free of charge from the Cambridge Crystallographic Data center via www.ccdc.cam.ac.uk/data-request/cif.
  • 79
    • 79954994821 scopus 로고    scopus 로고
    • Our results and Feng's implies that the use of bifunctional catalysts might favor the IEDDA mechanism. In Ref. 11, where guanidine was used as the catalyst, good-to-excellent diastereoselectivities were observed and the authors preferred route I based on some experimental studies
    • Our results and Feng's implies that the use of bifunctional catalysts might favor the IEDDA mechanism. In Ref. 11, where guanidine was used as the catalyst, good-to-excellent diastereoselectivities were observed and the authors preferred route I based on some experimental studies.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.