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Volumn 70, Issue 15, 2005, Pages 5818-5826

Probing the mechanism of sulfoxide-catalyzed hemiacetal activation in dehydrative glycosylation

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSIS; CHEMICAL ACTIVATION; CHEMICAL BONDS; ISOTOPES; NUCLEAR MAGNETIC RESONANCE; PERTURBATION TECHNIQUES; SULFUR COMPOUNDS; SYNTHESIS (CHEMICAL);

EID: 22244453031     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo050294c     Document Type: Article
Times cited : (52)

References (76)
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    • For the use of excess chiral sulfoxide for asymmetric allylation of hydrazones and aldehydes through coordinative acceleration see: (a) Kobayashi, S.; Ogawa, C.; Konishi, H.; Sugiura, M. J. Am. Chem. Soc. 2003, 125, 6610-6611.
    • (2003) J. Am. Chem. Soc. , vol.125 , pp. 6610-6611
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    • correction
    • (correction: Tetrahedron Lett. 2003, 44, 9067).
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  • 39
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    • note
    • 18O-incorp) to 2,3,4,6-tetra-O-methyl-D-mannopyranose.
  • 40
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    • note
    • 1H NMR.
  • 41
    • 32744477073 scopus 로고    scopus 로고
    • note
    • 18O-wash-out can arise as a consequence of 1,1′-α,α′-linked disaccharide (4) formation, which provides for an even greater excess of unconsumed sulfonic anhydride at the conclusion of the process.
  • 42
    • 32744465610 scopus 로고    scopus 로고
    • note
    • 18O-incorporation.
  • 43
    • 0033306129 scopus 로고    scopus 로고
    • 18O-incorporation into 11 as a function of its formation. See: Rishavy, M. A.; Cleland, W. W. Can. J. Chem. 1999, 77, 967-977.
    • (1999) Can. J. Chem. , vol.77 , pp. 967-977
    • Rishavy, M.A.1    Cleland, W.W.2
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    • (1977) J. Chem. Phys. , vol.66 , pp. 4983-4988
    • Jameson, C.J.1
  • 53
    • 0005504522 scopus 로고
    • This method has also been used to monitor positional isotope exchange in carbohydrates. See: (a) Mega, T. L.; Cortes, S.; Van Etten, R. L. J. Org. Chem. 1990, 55, 522-528.
    • (1990) J. Org. Chem. , vol.55 , pp. 522-528
    • Mega, T.L.1    Cortes, S.2    Van Etten, R.L.3
  • 56
    • 0002631324 scopus 로고
    • Prepared from the treatment of 2,3,4,6-tetra-O-methyl-D-mannopyranose with excess hydrogen fluoride-pyridine complex, following a known procedure for the conversion of glycosyl hemiacetals to glycosyl fluorides. See: Szarek, W. A.; Grynkiewicz, G.; Doboszewski, B.; Hay, G. W. Chem. Lett. 1984, 1751-1754.
    • (1984) Chem. Lett. , pp. 1751-1754
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  • 57
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    • Prepared from the treatment of benzene with trimethylsilyl chlorosulfonate following a known procedure. See: Hofman, K.; Simchen, G. Liebigs Ann. Chem. 1982, 282-297.
    • (1982) Liebigs Ann. Chem. , pp. 282-297
    • Hofman, K.1    Simchen, G.2
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    • 18O resonances was achieved by the application of a resolution enhancement of -0.8 Hz and a Gaussian apodization of 0.5 s. The application of resolution enhancement in FT NMR has been shown to have only a limited effect on the accuracy of integration. See: Kupka, T.; Dziegielewski, J. O. Magn. Reson. Chem. 1988, 26, 353-357.
    • (1988) Magn. Reson. Chem. , vol.26 , pp. 353-357
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  • 61
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    • [13C1-18O] (Scheme 11) would also generate pyridinium sulfonate as a byproduct.
    • [13C1-18O] (Scheme 11) would also generate pyridinium sulfonate as a byproduct.
  • 62
    • 32744464137 scopus 로고    scopus 로고
    • note
    • It should be noted that the advent of turnover in sulfoxide during the reaction precludes complete exclusion of the S(V7)-addition pathway (Scheme 3) from these data alone.
  • 64
    • 32744463745 scopus 로고    scopus 로고
    • 18O-incorporation was determined by using field ionization mass spectrometry.
    • 18O-incorporation was determined by using field ionization mass spectrometry.
  • 65
    • 32744454859 scopus 로고    scopus 로고
    • note
    • 1H NMR spectra were acquired at a rate of one spectrum every 10s.
  • 66
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    • note
    • 2.
  • 67
    • 32744472159 scopus 로고    scopus 로고
    • note
    • H1 5.14 ppm, formed slowly over the course of the reaction to the extent of 2%, was determined to be 1,1′-α,α-linked disaccharide 4 (Scheme 1).
  • 68
    • 32744473543 scopus 로고    scopus 로고
    • note
    • The minor transient resonance at δ 5.40 may correspond to the anomeric proton of the β-anomer of mannosyl sulfonate 11, although its rigorous structural verification has yet to be achieved.
  • 69
    • 32744462344 scopus 로고    scopus 로고
    • note
    • 1H NMR showed no change in the anomeric ratio of 9, indicating that the glycoside product did not equilibrate under the reaction conditions and that the observed 1:1 α:β mixture of glycosidic products in the glycosylation of 2-propanol to mannose hemiacetal 3 was under kinetic control.
  • 70
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    • The intermediacy of an oxocarbenium species is consistent with previous observations. See: (a) Stubbs, J. M.; Marx, D. J. Am. Chem. Soc. 2003, 125, 10960-10962.
    • (2003) J. Am. Chem. Soc. , vol.125 , pp. 10960-10962
    • Stubbs, J.M.1    Marx, D.2
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    • Cook, P. F., Ed.; CRC Press: Ann Arbor, MI
    • For kinetic isotope effects associated with glycosidic bond formation/hydrolysis, see: Schramm, V. L. In Enzyme Mechanism from Isotope Effects; Cook, P. F., Ed.; CRC Press: Ann Arbor, MI, 1991; pp 367-388.
    • (1991) Enzyme Mechanism from Isotope Effects , pp. 367-388
    • Schramm, V.L.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.