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Volumn 42, Issue 32, 2003, Pages 3788-3792

Nitrogen inversion as a diastereomeric relay in azasugar synthesis: The first synthesis of adenophorine

Author keywords

Asymmetric synthesis; Azasugars; Carbohydrates; Glycosidase inhibitors; Imines; Stereodynamics

Indexed keywords

NITROGEN; SYNTHESIS (CHEMICAL);

EID: 0042364896     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200351002     Document Type: Article
Times cited : (62)

References (61)
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    • note
    • Depending on the absolute configuration of adenophorine, either C1 or C5 of structure 3 may be viewed as the pseudoanomeric center.
  • 41
    • 0013610070 scopus 로고    scopus 로고
    • Additions of carbon nucleophiles to polyhydroxylated imines are rare. See T. Granier, A. Vasella, Helv Chim. Acta 1998, 81, 865 for the addition of trimethylsilyl cyanide.
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    • By the method of Vasella and co-workers: R. Hoos, A. B. Naughton, A. Vasella, Helv. Chim. Acta 1993, 76, 1802 and by additional methods that will be published elsewhere.
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    • note
    • The signals of 10 may broaden more readily because of smaller differences, relative to those of 9, in the chemical shifts of the two N-epimers in the slow-exchange limit, in addition to, or possibly instead of, differences in inversion exchange rates. Unfortunately, it was not possible to decoalesce the resonances of 10 and thus establish these shift differences.
  • 45
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    • This Saytzev-sense elimination to form a more substituted imine is presumably favored by a high degree of double-bond character in the typically late transition states in imine-forming eliminations. For the formation of Saytzev products in base-catalyzed eliminations in six-membered-ring systems see: N. O. Brace, J. Am. Chem. Soc. 1964, 86, 2428 and M. Bartok, K. Felfoldi, G. Bozoki-Bartok, Helv. Chim. Acta 1980, 63, 2173-2178.
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    • This Saytzev-sense elimination to form a more substituted imine is presumably favored by a high degree of double-bond character in the typically late transition states in imine-forming eliminations. For the formation of Saytzev products in base-catalyzed eliminations in six-membered-ring systems see: N. O. Brace, J. Am. Chem. Soc. 1964, 86, 2428 and M. Bartok, K. Felfoldi, G. Bozoki-Bartok, Helv. Chim. Acta 1980, 63, 2173-2178.
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    • For a primary example of the propensity of DBU to yield Saytzev elimination products see H. Oediger, F. Möller, Angew. Chem. 1967, 79, 53; Angew. Chem. Int. Ed. Engl. 1967, 6, 76.
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    • For a primary example of the propensity of DBU to yield Saytzev elimination products see H. Oediger, F. Möller, Angew. Chem. 1967, 79, 53; Angew. Chem. Int. Ed. Engl. 1967, 6, 76.
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    • -1 (based on the difference in ground-state energy for β-glucopyranose see P. L. Durette, D. Horton, Adv. Carbohydr. Chem. Biochem. 1971, 26, 49), this conformer would be present at <0.001%.
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    • -1 to N-inversion exists at 248 K. Further investigations will be published in due course.
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    • note
    • See Supporting Information for a more detailed discussion. Details of further investigations will be published in due course.
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    • note
    • [9c] Further details will be published in due course.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.