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Volumn 63, Issue 42, 2007, Pages 10521-10527

Enantioselective synthesis of α-hydroxy-β-amino acids from α-amino acids mediated by sulfoxides

Author keywords

[No Author keywords available]

Indexed keywords

3 AMINO HYDROXYBUTANOIC ACID; ALANINE DERIVATIVE; ALPHA AMINO ACID; ALPHA HYDROXY BETA AMINO ACID; AMINO ACID DERIVATIVE; BUTYRIC ACID; COLLIDINE; SULFOXIDE; UNCLASSIFIED DRUG;

EID: 34548405280     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tet.2007.07.072     Document Type: Article
Times cited : (12)

References (37)
  • 30
    • 34548432708 scopus 로고    scopus 로고
    • note
    • 3 is too weakly basic to form the alkoxide from the primary alcohol, which should be the required intermediate for the TBDMS migration.
  • 31
    • 34548430644 scopus 로고    scopus 로고
    • note
    • The normal Pummerer products were not detected in any of these reactions, may be due to the smooth conditions used.
  • 36
    • 3042827018 scopus 로고    scopus 로고
    • Amide oxygen attack on sulfur resulting in the formation of a six-membered ring intermediate has also been suggested as the second step in the evolution of β-amino sulfoxides (see ) as alternative to the amide nitrogen attack resulting in the azathiacyclobutane suggested by Zanda in Ref. 15d. This proposal was based on the higher stability of a 6-membered over a 4-membered cyclic systems. The attack of the nitrogen to the sulfur is the only able to explain the results obtained from the γ-amino sulfoxides described in this work because the attack of the oxygen would not explain the formation of compounds 6 or 7, bearing the S-N bond. Taking into account that Zanda et al. have also isolated the sulfenamides from the NOPR of (Ref. 15d), an azathiacyclobutane intermediate resulting in the nitrogen attack seem to be the most probable intermediate also for β-amino sulfoxides
    • Amide oxygen attack on sulfur resulting in the formation of a six-membered ring intermediate has also been suggested as the second step in the evolution of β-amino sulfoxides (see. García Ruano J.L., Alemán J., Prado M., and Fernández I. J. Org. Chem. 69 (2004) 4454 ) as alternative to the amide nitrogen attack resulting in the azathiacyclobutane suggested by Zanda in Ref. 15d. This proposal was based on the higher stability of a 6-membered over a 4-membered cyclic systems. The attack of the nitrogen to the sulfur is the only able to explain the results obtained from the γ-amino sulfoxides described in this work because the attack of the oxygen would not explain the formation of compounds 6 or 7, bearing the S-N bond. Taking into account that Zanda et al. have also isolated the sulfenamides from the NOPR of (Ref. 15d), an azathiacyclobutane intermediate resulting in the nitrogen attack seem to be the most probable intermediate also for β-amino sulfoxides
    • (2004) J. Org. Chem. , vol.69 , pp. 4454
    • García Ruano, J.L.1    Alemán, J.2    Prado, M.3    Fernández, I.4
  • 37
    • 34548409678 scopus 로고    scopus 로고
    • note
    • Similar results were obtained starting from 5a.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.