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Volumn 12, Issue 3, 2010, Pages 512-515

Dynamic kinetic resolution: Asymmetrie transfer hydrogénation of α-alkyl-substituted β-ketoamides

Author keywords

[No Author keywords available]

Indexed keywords

AMIDE; BETA KETOAMIDE; BETA LACTAM; BETA-KETOAMIDE;

EID: 75749105381     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol902715d     Document Type: Article
Times cited : (70)

References (49)
  • 29
    • 0033548063 scopus 로고    scopus 로고
    • For an example of enzymatic DKR-ATH of 2-oxocyclopentanecarboxamides
    • For an example of enzymatic DKR-ATH of 2-oxocyclopentanecarboxamides, see: Quirós, M.; Rebolledo, F.; Gotor, V. Tetrahedron: Asymmetry 1999, 10, 473.
    • (1999) Tetrahedron: Asymmetry , vol.10 , pp. 473
    • Quirós, M.1    Rebolledo, F.2    Gotor, V.3
  • 30
    • 0001222924 scopus 로고
    • For reviews, see: (a)
    • For reviews, see: (a) Knapp, S. Chem. Rev. 1995, 95, 1859.
    • (1995) Chem. Rev. , vol.95 , pp. 1859
    • Knapp, S.1
  • 32
    • 53549128637 scopus 로고    scopus 로고
    • For representative examples, (a)
    • For representative examples, see: (a) Brandi, A.; Cicchi, S.; Cordero, F. M. Chem. Rev. 2008, 108, 3988.
    • (2008) Chem. Rev. , vol.108 , pp. 3988
    • Brandi, A.1    Cicchi, S.2    Cordero, F.M.3
  • 38
    • 0348231814 scopus 로고    scopus 로고
    • For examples of nonasymmetric, but diastereoselective, reduction of racemic a-substituted β-ketoamides, see: (a)
    • For examples of nonasymmetric, but diastereoselective, reduction of racemic a-substituted β-ketoamides, see: (a) Bartoli, G.; Bosco, M.; Marcantoni, E.; Melchiorre, P.; Rinaldi, S.; Sambri, L. Synlett 2004, 1, 73.
    • (2004) Synlett , vol.1 , pp. 73
    • Bartoli, G.1    Bosco, M.2    Marcantoni, E.3    Melchiorre, P.4    Rinaldi, S.5    Sambri, L.6
  • 41
    • 75749158227 scopus 로고    scopus 로고
    • See Supporting Information for the synthesis of this compound.
    • See Supporting Information for the synthesis of this compound.
  • 43
    • 75749100702 scopus 로고    scopus 로고
    • note
    • For ease of discussion, the term "enantioselectivity" refers to the absolute configuration at carbon 2 and 3 of the syn-epimer 3a while ignoring the fixed stereocenter at the benzylic carbon labeled 6 [i.e., (2R,3R,6S) vs (2S,3S,6S)].
  • 44
    • 75749156697 scopus 로고    scopus 로고
    • note
    • The absolute stereochemistry was confirmed by X-ray single-crystal structure (see Supporting Information). Additional information can be found at the Cambridge Crystallographic Data Centre (CCDC) with deposition code of CCDC 752316.
  • 47
    • 0022516675 scopus 로고
    • For phase transfer catalyzed cyclization of O-phosphorylated or O-benzoylated substrates, see ref.8c For a nonphase transfer promoted process
    • For phase transfer catalyzed cyclization of O-phosphorylated or O-benzoylated substrates, see ref.8c For a nonphase transfer promoted process, see: Evans, D. A.; Sjogren, E. B. Tetrahedron Lett. 1986,27, 3119.
    • (1986) Tetrahedron Lett. , vol.27 , pp. 3119
    • Evans, D.A.1    Sjogren, E.B.2
  • 48
    • 75749116036 scopus 로고    scopus 로고
    • note
    • While executing the mesylation at higher temperatures (>5 °C) resulted in partial chloride displacement leading to syn β-lactams, performing the cyclization under homogenous conditions (KOtBu/THF or LiHMDS/ THF) gave initially the trans-β-lactam 6, which during the course of the reaction equilibrated rapidly to a 4:1 mixture of trans:syn β-lactams.
  • 49
    • 75749111079 scopus 로고    scopus 로고
    • note
    • 3Si: C, 50.57; H, 5.09; N, 1.97. Found: C, 50.72; H, 5.10; N, 1.86.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.