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Volumn 75, Issue 6, 2010, Pages 1898-1910

Cascade [l,3]-sigmatropic rearrangements of ketene O,O-acetals: Kinetic and DFT level mechanistic studies

Author keywords

[No Author keywords available]

Indexed keywords

CHEMICAL REACTIONS; HYDROCARBONS; PROBABILITY DENSITY FUNCTION; SULFUR COMPOUNDS;

EID: 77949802560     PISSN: 00223263     EISSN: 15206904     Source Type: Journal    
DOI: 10.1021/jo902520z     Document Type: Article
Times cited : (6)

References (74)
  • 1
    • 77949867485 scopus 로고
    • Rahman, A.-U., F.d.; Elsevier: Amsterdam
    • For a review of applications of ketene acetal rearrangement in synthesis, see: Tadano, K. In Studies in Natural Products Chemistry; Rahman, A.-U., F.d.; Elsevier: Amsterdam, 1992; pp 405-455.
    • (1992) Studies in Natural Products Chemistry , pp. 405-455
    • Tadano, K.1
  • 10
    • 84962465387 scopus 로고    scopus 로고
    • For a review which includes the [l,3]-sigmatropic rearrangement of ketene acetals, see: Nasveschuk, C. G.; Rovis, T. Org. Biomol. Chem. 2008, 6, 242-244.
    • (2008) Org. Biomol. Chem. , vol.6 , pp. 242-244
    • Nasveschuk, C.G.1    Rovis, T.2
  • 27
    • 84962470470 scopus 로고    scopus 로고
    • 3) δ 3.10 (endo), 3.35 (exo) ppm.
    • 3) δ 3.10 (endo), 3.35 (exo) ppm.
  • 31
    • 0001557536 scopus 로고
    • Wiley: New York
    • Arndt, F. Organic Syntheses; Wiley: New York, 1943; Vol.2, pp 165-167.
    • (1943) Organic Syntheses , vol.2 , pp. 165-167
    • Arndt, F.1
  • 32
    • 84962465379 scopus 로고    scopus 로고
    • 3 because the acidic character of the later resulted in reconverted cyano lactones 1a-e in minor amounts, together with decomposition products.
    • 3 because the acidic character of the later resulted in reconverted cyano lactones 1a-e in minor amounts, together with decomposition products.
  • 36
    • 84962465370 scopus 로고    scopus 로고
    • The GC/MS of pure compounds 2e, 4e, and 5e provided identical retention times and mass spectral patterns.
    • The GC/MS of pure compounds 2e, 4e, and 5e provided identical retention times and mass spectral patterns.
  • 37
    • 84962465373 scopus 로고    scopus 로고
    • Compounds 2a, 2b, 4a, and 4b, according to their instability, could not be isolated at the pure state.
    • Compounds 2a, 2b, 4a, and 4b, according to their instability, could not be isolated at the pure state.
  • 38
    • 84962465371 scopus 로고    scopus 로고
    • Supporting Information; see the paragraph at the end of this paper regarding availability.
    • Supporting Information; see the paragraph at the end of this paper regarding availability.
  • 39
    • 84962423040 scopus 로고    scopus 로고
    • 2-c3 is 84-86 ppm; see ref 12.
    • 2-c3 is 84-86 ppm; see ref 12.
  • 49
    • 84962359731 scopus 로고    scopus 로고
    • Because C3-C8a bond breaking in 3a-e is expected to be disfavored in comparison to C3-C3a bond, breaking, the ring-contraction 2a-e to 3a-e should be essentially irreversible on enthalpic grounds.
    • Because C3-C8a bond breaking in 3a-e is expected to be disfavored in comparison to C3-C3a bond, breaking, the ring-contraction 2a-e to 3a-e should be essentially irreversible on enthalpic grounds.
  • 57
    • 84962411399 scopus 로고    scopus 로고
    • A significant shortening of the C3-C11 bond in 4d (1.407(3) ̊) and 4e (1.405(3) Å) as compared to the C3-C11 bond, in 3c (1.442(3) Å) was observed.
    • A significant shortening of the C3-C11 bond in 4d (1.407(3) ̊) and 4e (1.405(3) Å) as compared to the C3-C11 bond, in 3c (1.442(3) Å) was observed.
  • 67
    • 84962347267 scopus 로고    scopus 로고
    • This result could indicate that the ionic path has a transition state too high in energy which, crosses the surface of the sigmatropic shift, or simply does not exist.
    • This result could indicate that the ionic path has a transition state too high in energy which, crosses the surface of the sigmatropic shift, or simply does not exist.
  • 68
    • 84962347264 scopus 로고    scopus 로고
    • -1 in the gas phase.
    • -1 in the gas phase.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.