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Volumn 125, Issue 39, 2003, Pages 11942-11955

Highly diastereoselective hydrogenations leading to β-hydroxy δ-lactones in hydroxy-protected form. A modified view of δ-lactone conformations

Author keywords

[No Author keywords available]

Indexed keywords

CONFORMATIONS; HYDROGENATION; SUBSTRATES; X RAY CRYSTALLOGRAPHY;

EID: 0141508976     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja036002b     Document Type: Article
Times cited : (25)

References (178)
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    • (d) Hudlicky, M. In Comprehensive Organic Synthesis; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: Oxford, 1991; Vol. 8, p 910.
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    • We use the IUPAC conformational nomenclature of carbohydrates but not the ring numbering; the latter follows the systematic name. See: Pure Appl. Chem. 1996, 68, 1919-2008. Carbohydr. Res. 1997, 297, 1-92. In the cyclohexane series, the skew is called twist. See ref 55e and IUPAC Compendium of Chemical Terminology; McNaught, A. D., Wilkinson, A., Eds.; Blackwell Science: Oxford, 1997; for an online version, see http://www.chemsoc.org/chembytes/goldbook/C00964.pdf.
    • (1996) Pure Appl. Chem. , vol.68 , pp. 1919-2008
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    • 84900403742 scopus 로고    scopus 로고
    • We use the IUPAC conformational nomenclature of carbohydrates but not the ring numbering; the latter follows the systematic name. See: Pure Appl. Chem. 1996, 68, 1919-2008. Carbohydr. Res. 1997, 297, 1-92. In the cyclohexane series, the skew is called twist. See ref 55e and IUPAC Compendium of Chemical Terminology; McNaught, A. D., Wilkinson, A., Eds.; Blackwell Science: Oxford, 1997; for an online version, see http:// www.chemsoc.org/chembytes/goldbook/C00964.pdf.
    • (1997) Carbohydr. Res. , vol.297 , pp. 1-92
  • 64
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    • McNaught, A. D. Wilkinson, A., Eds.; Blackwell Science Oxford
    • We use the IUPAC conformational nomenclature of carbohydrates but not the ring numbering; the latter follows the systematic name. See: Pure Appl. Chem. 1996, 68, 1919-2008. Carbohydr. Res. 1997, 297, 1-92. In the cyclohexane series, the skew is called twist. See ref 55e and IUPAC Compendium of Chemical Terminology; McNaught, A. D., Wilkinson, A., Eds.; Blackwell Science: Oxford, 1997; for an online version, see http:// www.chemsoc.org/chembytes/goldbook/C00964.pdf.
    • (1997) IUPAC Compendium of Chemical Terminology
  • 67
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    • note
    • (c) The Z (s-trans) conformers of esters are 5-6 kcal/ mol more stable than the E conformers; the energy barriers are typically 10-13 kcal/mol.55d
  • 68
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    • (d) From matrix 1R spectra of methyl acetate, the E/Z difference was estimated as 8.5 ± 1.0 kcal/mol. Blom, C. E.; Gunthard, H. H. Chem. Phys. Lett. 1981, 84, 267-271.
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    • (a) http://www.nrc.ca/ibs/6ring.html.
  • 84
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    • note
    • (b) This web interface sometimes erroneously uses the third characterization line. Thus, two of the four most typical boats in Table 5 (entries 2 and 5) are described as predominantly skew forms on the third characterization line. Compounds in entries 3 and 4 are correctly described as boats.
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    • (b) DeShong, P.; Simpson, D. M.; Lin, M.-T. Tetrahedron Lett. 1989, 30, 2885-2888. Ammon, H. L.; DeShong, P.; Simpson, D. Acta Crystallogr., Sect. C 1991, 47, 2482-2484.
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    • DeShong, P.1    Simpson, D.M.2    Lin, M.-T.3
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    • note
    • 3, 400 MHz): δ 4.38 (ddq, J = 12.4, 6.2, 4.0 Hz, H-6), 4.31 (dt, J = 8.2. 3.6 Hz, H-4), 3.09 (m, J = 8.2, 5.5, 4.4 Hz, H-3), 2.35 (ddd, J = 14.2, 8.2, 4.0 Hz, H-5), 1.54 (ddd, J = 14.2, 11.2, 3.3 Hz, H-5). We thank Prof. Philip DeShong, University of Maryland, for kindly communicating these and other unpublished data.
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    • and references therein
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    • note
    • (b) The trans isomer was ascribed a "slightly flattened" half-chair conformation, but in our opinion the drawing shows a strongly twisted boat (possibly a skew).
  • 173
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    • note
    • We found this TS which probably is the lowest barrier.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.