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Volumn 49, Issue 15, 2010, Pages 2772-2776

Reversal of enantioselectivity by tuning the conformational flexibility of phase-transfer catalysts

Author keywords

Asymmetric synthesis; Conformational flexibility; Conjugate addition; Enantioselectivity; Phase transfer catalysis

Indexed keywords

ASYMMETRIC CATALYSIS; ASYMMETRIC SYNTHESIS; CHALCONES; CHIRAL CATALYST; CONFORMATIONAL FLEXIBILITY; CONJUGATE ADDITION; NITROALKANES; PHASE TRANSFER CATALYSIS; PHASE-TRANSFER CATALYSTS; QUATERNARY AMMONIUM SALT;

EID: 77950466555     PISSN: 14337851     EISSN: 15213773     Source Type: Journal    
DOI: 10.1002/anie.200906814     Document Type: Article
Times cited : (59)

References (74)
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    • catalysis by metal complexes
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    • (2007) Eur. J. Org. Chem. , vol.1701
  • 55
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    • CCDC 734390 (8j) and 734391 (81) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via
    • CCDC 734390 (8j) and 734391 (81) contain 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.
  • 59
    • 77949627101 scopus 로고    scopus 로고
    • DOI: 10.1021/cr9002352. and references therein; recent examples
    • d) M. Bartók, Chem. Rev. 2009, DOI: 10.1021/cr9002352. and references therein; recent examples:
    • (2009) Chem. Rev.
    • Bartók, M.1
  • 68
    • 77950496384 scopus 로고    scopus 로고
    • For the addition of nitroethane to chalcone: Adduct isolated in 94 % yield, d.r. = 33:67 (synlanti), e.r. = 93:7 (syn), e.r. = 95.5: 4.5(Anti) (By Using Catalyst 81).
    • For the addition of nitroethane to chalcone: adduct isolated in 94 % yield, d.r. = 33:67 (synlanti), e.r. = 93:7 (syn), e.r. = 95.5: 4.5 (anti) (by using catalyst 81).
  • 70
    • 77950475913 scopus 로고    scopus 로고
    • Catalyst81 (1 mol %) was used in the reaction of 2-nitropropane with la on a 30 mmol scale, and delivered adduct (5)-2a in 99% yield withe.r.=99.01.0:itwasrecoveredinpureformin97%yield. SeetheSupportingInformationforexperimentaldetailsfortherecyclingandreuseoft catalyst
    • For example, catalyst 81 (1 mol %) was used in the reaction of 2-nitropropane with la on a 30 mmol scale, and delivered adduct (5)-2a in 99% yield with e.r. = 99.0: 1.0: it was recovered in pure form in 97% yield. See the Supporting Information for experimental details for the recycling and reuse of the catalyst.
  • 71
    • 77950512485 scopus 로고    scopus 로고
    • Two monocationic analogues derived from piperidine and 4-methylpiperidine were prepared and used for the addition of 2-nitropropane to chalcone: yield <40%, e.r. = <52.5: 47.5 (see the Supporting Information). These preliminary results suggest that both ammonium centers in 8j and 81 could be involved in the dual activation process of the reactants. In addition, the preparation of the corresponding chiral ammonium salts of carbanions (nitronate and/or malonate) is ongoing, and more data are being accumulated. For achiral ammonium salts of carbanions
    • Two monocationic analogues derived from piperidine and 4-methylpiperidine were prepared and used for the addition of 2-nitropropane to chalcone: yield <40%, e.r. = <52.5: 47.5 (see the Supporting Information). These preliminary results suggest that both ammonium centers in 8j and 81 could be involved in the dual activation process of the reactants. In addition, the preparation of the corresponding chiral ammonium salts of carbanions (nitronate and/or malonate) is ongoing, and more data are being accumulated. For achiral ammonium salts of carbanions,


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