메뉴 건너뛰기




Volumn 128, Issue 41, 2006, Pages 13640-13648

Racemization in prins cyclization reactions

Author keywords

[No Author keywords available]

Indexed keywords

ISOTOPES; SOLVENTS; STEREOCHEMISTRY; THERMAL EFFECTS;

EID: 33750041945     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja064783l     Document Type: Article
Times cited : (109)

References (84)
  • 1
    • 2642675659 scopus 로고
    • For reviews on the Prins cyclization, see: (a) Arundale, E.; Mikeska, L. A. Chem. Rev. 1952, 52, 505-555.
    • (1952) Chem. Rev. , vol.52 , pp. 505-555
    • Arundale, E.1    Mikeska, L.A.2
  • 3
    • 0001290261 scopus 로고
    • Trost, B. M., Fleming, I., Heathcock, C. H., Eds.; Pergamon Press: New York
    • (c) Snider, B. B. In The Prins Reaction and Carbonyl Ene Reactions; Trost, B. M., Fleming, I., Heathcock, C. H., Eds.; Pergamon Press: New York, 1991; Vol. 2, pp 527-561.
    • (1991) The Prins Reaction and Carbonyl Ene Reactions , vol.2 , pp. 527-561
    • Snider, B.B.1
  • 5
    • 33750057104 scopus 로고    scopus 로고
    • For a recent review on the synthesis of tetrahydropyran rings, see: Santos, S.; Clarke, P. A. Eur. J. Org. Chem. 2006, 2045-2053.
    • (2006) Eur. J. Org. Chem. , pp. 2045-2053
    • Santos, S.1    Clarke, P.A.2
  • 42
    • 33750078522 scopus 로고    scopus 로고
    • note
    • The numbering system is as follows: (Diagram presented)
  • 73
    • 0001207667 scopus 로고    scopus 로고
    • (a) Trans products have been observed for vinylsilane-terminated cyclizations of ester-substituted oxocarbenium ion intermediates: Semeyn, C.; Blaauw, R. H.; Hiemstra, H.; Speckamp, W. N. J. Org. Chem. 1997, 62, 3426-3427.
    • (1997) J. Org. Chem. , vol.62 , pp. 3426-3427
    • Semeyn, C.1    Blaauw, R.H.2    Hiemstra, H.3    Speckamp, W.N.4
  • 74
    • 0043268060 scopus 로고    scopus 로고
    • (b) Trans products have been observed when employing a substrate with a small sp-hybridized side chain: Hart, D. J.; Bennett, C. E. Org. Lett. 2003, 5, 1499-1502.
    • (2003) Org. Lett. , vol.5 , pp. 1499-1502
    • Hart, D.J.1    Bennett, C.E.2
  • 78
    • 33750047976 scopus 로고    scopus 로고
    • note
    • Racemization by Mechanism D would not result in deuterium scrambling. The microscopic reverse of Mechanism E is also possible in which 2-oxonia-Cope rearrangement proceeds through the favorable E-oxocarbenium ion, but with the alkyl substituent in a pseudoaxial orientation.
  • 79
    • 33750063306 scopus 로고    scopus 로고
    • note
    • 1H NMR. We cannot rule out the possibility that the trans isomer may be formed in very small quantity as a minor component.
  • 80
    • 33750059613 scopus 로고    scopus 로고
    • note
    • See ref 3e for a similar effect.
  • 81
    • 33750040677 scopus 로고    scopus 로고
    • note
    • Geometry optimizations were performed with B3LYP/6-31G* as implemented in Gaussian 03 (ref 30). Minima were characterized by their vibrational frequencies.
  • 83
    • 33750036229 scopus 로고    scopus 로고
    • note
    • The unexpectedly large difference in energy between 93 and 94 can be attributed to more effective stabilization of the oxocarbenium ion in 93 by π-complex formation with the more highly substituted alkene.
  • 84
    • 33750040104 scopus 로고    scopus 로고
    • note
    • An expanded table for this calculation is provided in the Supporting Information.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.