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Volumn , Issue 7, 2006, Pages 1205-1219

Copper-catalyzed ring-opening of heterobicyclic alkenes with Grignard reagents: Remarkably high anti-stereocontrol

Author keywords

(2 pyridyl)sulfonamides; Azabenzonorbornadiene; Copper catalyst; Grignard reagents; Oxabicyclic alkenes; Ring opening reaction

Indexed keywords

AROMATIC COMPOUNDS; COPPER; REACTION KINETICS; STEREOCHEMISTRY;

EID: 33645993937     PISSN: 00397881     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2006-926379     Document Type: Article
Times cited : (29)

References (86)
  • 1
    • 0001916408 scopus 로고
    • For recent reviews, see: (a) Lautens, M. Synthesis 1993, 177.
    • (1993) Synthesis , pp. 177
    • Lautens, M.1
  • 4
    • 0030857960 scopus 로고    scopus 로고
    • For natural product synthesis using this strategy, see: (a) Lautens, M.; Rovis, T. J. Org. Chem. 1997, 62, 5246.
    • (1997) J. Org. Chem. , vol.62 , pp. 5246
    • Lautens, M.1    Rovis, T.2
  • 12
    • 33646015017 scopus 로고    scopus 로고
    • Results communicated within reference 1a (p 182)
    • Results communicated within reference 1a (p 182).
  • 46
    • 0037076930 scopus 로고    scopus 로고
    • (a) For the Cu-catalyzed ring opening addition of Grignard reagents to 3-aza-2-oxabicyclo[2.2.1]hept-5-ene systems, see: Surman, M. D.; Mulvihill, M. J.; Miller, M. J. J. Org. Chem. 2002, 67, 4115.
    • (2002) J. Org. Chem. , vol.67 , pp. 4115
    • Surman, M.D.1    Mulvihill, M.J.2    Miller, M.J.3
  • 47
    • 33645978043 scopus 로고    scopus 로고
    • note
    • (b) On the other hand, some examples of Zr-catalyzed ring-opening addition of Grignard reagents to [3.2.1]oxabicycles are found in reference 8.
  • 53
    • 33645987860 scopus 로고    scopus 로고
    • note
    • Upon screening other commonly used ligands for copper such as dimethyl ethylenediamine, BINAP or bisoxazolines, it was found that the use of Ph3P was crucial for achieving good yield and high anti selectivity.
  • 55
    • 0042236976 scopus 로고    scopus 로고
    • N2′ addition of Grignard reagents to allylic chlorides, see: Alexakis, A.; Croset, K. Org. Lett. 2002, 4, 4147.
    • (2002) Org. Lett. , vol.4 , pp. 4147
    • Alexakis, A.1    Croset, K.2
  • 56
    • 33645963707 scopus 로고    scopus 로고
    • note
    • 3P provided anti-2b in lower yield due to the formation of 3 (8%) and 4 (7%) in the reaction mixture.
  • 57
    • 33645988771 scopus 로고    scopus 로고
    • note
    • 3P, CuCl alone gave a 58:35:5 mixture of anti-2b, naphthalenol 3 and naphthalene (4), respectively, in the reaction of 1a with EtMgBr.
  • 58
    • 33646003209 scopus 로고    scopus 로고
    • note
    • The anti stereochemistry of the ring-opened products was assigned by comparison of their NMR data with those of the reported compounds anti-2a, anti-2b (see ref. 26), and anti-9a and anti-9g (see ref. 21).
  • 61
    • 0021919238 scopus 로고
    • These substrates were prepared by Diels-Alder cycloaddition of furan with substituted benzyne intermediates: (a) 1d: Jung, M. E.; Lam, P. Y.-S.; Mansuri, M. M.; Spelt, L. M. J. Org. Chem. 1985, 50, 1087.
    • (1985) J. Org. Chem. , vol.50 , pp. 1087
    • Jung, M.E.1    Lam, P.Y.-S.2    Mansuri, M.M.3    Spelt, L.M.4
  • 67
    • 33645990250 scopus 로고    scopus 로고
    • note
    • (c) For previous ring opening of substrate 11, see reference 16.
  • 68
    • 33645983589 scopus 로고    scopus 로고
    • note
    • 2.
  • 78
    • 33645968062 scopus 로고    scopus 로고
    • note
    • For a similar (π-allyl)copper pathway suggested in the anti-stereoselective addition of dialkylzinc reagents to oxabenzonorbornadienes, see reference 16.
  • 79
    • 0035805286 scopus 로고    scopus 로고
    • and references cited therein
    • III complex can undergo a fast reductive elimination prior to isomerization: (a) Sofia, A.; Karlstrom, E.; Bäckvall, J.-E. Chem. Eur. J. 2001, 7, 1981; and references cited therein.
    • (2001) Chem. Eur. J. , vol.7 , pp. 1981
    • Sofia, A.1    Karlstrom, E.2    Bäckvall, J.-E.3
  • 82
    • 0000283131 scopus 로고    scopus 로고
    • N2′ selectivity. For an excellent review on reaction mechanisms of organocuprate reagents in organic transformations, see: (a) Nakamura, E.; Mori, S. Angew. Chem. Int. Ed. 2000, 39, 3750.
    • (2000) Angew. Chem. Int. Ed. , vol.39 , pp. 3750
    • Nakamura, E.1    Mori, S.2
  • 85
    • 33645961248 scopus 로고    scopus 로고
    • note
    • 2Zn (1,2-dichloroethane, reflux), instead of EtMgBr, afforded exclusively the product syn-22b with only 20% conversion after 48 h (Figure 1), evidencing the key role exerted by the Grignard reagent in achieving both high reactivity and anti-stereocontrol. (Diagram presented)


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