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Volumn 126, Issue 34, 2004, Pages 10676-10681

Cu-catalyzed asymmetric allylic alkylations of aromatic and aliphatic phosphates with alkylzinc reagents. An effective method for enantioselective synthesis of tertiary and quaternary carbons

Author keywords

[No Author keywords available]

Indexed keywords

AMINO ACIDS; AROMATIC COMPOUNDS; CATALYSIS; OLEFINS; PHOSPHATES; SUBSTRATES;

EID: 4344569716     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja0478779     Document Type: Article
Times cited : (131)

References (55)
  • 3
    • 0003134584 scopus 로고    scopus 로고
    • Jacobsen, E. N., Pfaltz, A., Yamamoto, H., Eds.; Springer: Berlin, Germany
    • For a review, see: Hoveyda, A. H.; Heron, N. M. In Comprehensive Asymmetric Catalysis; Jacobsen, E. N., Pfaltz, A., Yamamoto, H., Eds.; Springer: Berlin, Germany, 1999; pp 431-454.
    • (1999) Comprehensive Asymmetric Catalysis , pp. 431-454
    • Hoveyda, A.H.1    Heron, N.M.2
  • 19
    • 4344628712 scopus 로고    scopus 로고
    • note
    • A brief initial screening with selected di- and trisubstituted olefinic substrates (see Tables 1 and 2, below) indicated that although chiral ligand 2 is typically as effective in promoting catalytic alkylations, in a few instances dipeptide 3 promotes more efficient and/or enantioselective C-C bond forming reactions.
  • 20
    • 4344579034 scopus 로고    scopus 로고
    • note
    • N2′).
  • 23
    • 1542590132 scopus 로고
    • For representative relevant experimental and theoretical studies, see: (a) Goering, H. L.; Kantner, S. S. J. Org. Chem. 1983, 48, 721-724.
    • (1983) J. Org. Chem. , vol.48 , pp. 721-724
    • Goering, H.L.1    Kantner, S.S.2
  • 28
    • 4344648343 scopus 로고    scopus 로고
    • note
    • 1 Cu complex i to π-allyl ii which then can afford the undesired product. The reason for the propensity of aromatic disubstituted phosphates (Table 1) to afford achiral alkylation byproducts is not clear at the present time. See ref 13 for related discussions. (diagram presented.)
  • 29
    • 4344612115 scopus 로고    scopus 로고
    • note
    • For a related proposal involving two-point association between catalyst and substrate in a Cu-catalyzed allylic alkylation reaction, see ref 5a.
  • 30
    • 4344682792 scopus 로고    scopus 로고
    • note
    • Although a Zn chelate involving the amide C=O is shown in II and III, it is possible that the amide N participates in this chelation. It is also feasible that H-bonding between the secondary amide and the P=O of the substrate leads to the second point of contact between catalyst and substrate.
  • 31
    • 4344673703 scopus 로고    scopus 로고
    • note
    • 2Zn (under conditions described for Table 1) leads to only ∼20% conversion and <2% ee. The latter observation may underscore the significance of specific Lewis base-Lewis acid distances for effective generation of substrate-catalyst complexes.
  • 34
    • 4344584094 scopus 로고    scopus 로고
    • note
    • The substrate/catalyst complex derived from (S)-24 and (L,L)-3 is energetically equivalent to that arising from (R)-24 and (D,D)-3 and is therefore used here for the sake of clarity of discussion.
  • 35
    • 0347129770 scopus 로고    scopus 로고
    • For another example, where, in the presence of a chiral amino acid-based ligand, diastereoselectivities are enhanced significantly, see: Cesati, R. R.; de Armas, J.; Hoveyda, A. H. J. Am. Chem. Soc. 2004, 126, 96-101.
    • (2004) J. Am. Chem. Soc. , vol.126 , pp. 96-101
    • Cesati, R.R.1    De Armas, J.2    Hoveyda, A.H.3
  • 36
    • 0000803780 scopus 로고    scopus 로고
    • For recent reviews of metal-catalyzed kinetic resolutions, see: (a) Hoveyda, A. H.; Didiuk, M. T. Curr. Org. Chem. 1998, 2, 537-574.
    • (1998) Curr. Org. Chem. , vol.2 , pp. 537-574
    • Hoveyda, A.H.1    Didiuk, M.T.2
  • 39
    • 0032473509 scopus 로고    scopus 로고
    • For a review of catalytic enantioselective methods for the synthesis of quaternary carbon stereogenic centers, see: (a) Corey, E. J.; Guzman-Perez, A. Angew. Chem., Int. Ed. 1998, 37, 388-401.
    • (1998) Angew. Chem., Int. Ed. , vol.37 , pp. 388-401
    • Corey, E.J.1    Guzman-Perez, A.2
  • 43
    • 0042141396 scopus 로고    scopus 로고
    • Krause, N., Ed.; Wiley-VCH: Weinheim, Germany
    • For example, see: Breit, B.; Demel, P. In Modern Organocopper Chemistry; Krause, N., Ed.; Wiley-VCH: Weinheim, Germany, 2002; pp 188-223.
    • (2002) Modern Organocopper Chemistry , pp. 188-223
    • Breit, B.1    Demel, P.2
  • 45
    • 0037125521 scopus 로고    scopus 로고
    • For a related approach to enantioselective synthesis of ketones through Cu-catalyzed conjugate additions to cyclic nitroalkenes, see: Luchaco-Cullis, C. A.; Hoveyda, A. H. J. Am. Chem. Soc. 2002, 124, 8192-8193.
    • (2002) J. Am. Chem. Soc. , vol.124 , pp. 8192-8193
    • Luchaco-Cullis, C.A.1    Hoveyda, A.H.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.