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Volumn 62, Issue 8, 1997, Pages 2471-2477

Improvement of TADDOLate-TiCl2-Catalyzed 1,3-Dipolar Nitrone Cycloaddition by Substitution of the Oxazolidinone Auxiliary of the Alkene with Succinimide

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EID: 0000619069     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo962214y     Document Type: Article
Times cited : (105)

References (74)
  • 3
    • 0343110522 scopus 로고
    • Mulzer, J., Altenbach, H.-J., Braun, M., Krohn, K., Reissig, H.-U., Eds.; VCH: New York
    • (c) Mulzer, J. In Organic Synthesis Highlights; Mulzer, J., Altenbach, H.-J., Braun, M., Krohn, K., Reissig, H.-U., Eds.; VCH: New York, 1991; p 77.
    • (1991) Organic Synthesis Highlights , pp. 77
    • Mulzer, J.1
  • 59
    • 1542496587 scopus 로고    scopus 로고
    • note
    • In an attempt to account for the endo-selectivity in the 1,3-dipolar cycloaddition reaction of nitrone 2a with N-crotonoylsuccinimide (11a) a series of ab initio calculations have been performed using a 3-21G* basis set. The geometry of both 11a-s-cis (total energy = -583.970 au) and 11a-s-trans have been optimized, and it has been found that the former is 5 kcal/mol more stable than the latter. The dihedral angle of the alkene plane relative to the succinimide plane of 11a-s-trans is 24°. A comparison of the approach of 2a to 11a-s-cis leading to endo-12a and exo-12a reveals that for the latter a steric repulsion between the C-phenyl substituent of the nitrone and one of the carbonyls of the succinimide group may account for the former reaction path.
  • 60
    • 1542601335 scopus 로고    scopus 로고
    • note
    • We have also tried to use N-crotonoylsuccinimide (11a) as the substrate m Ti-TADDOLate catalyzed Diels-Alder reactions with cyclopentadiene as the reagent, but the Diels-Alder product was formed with low diastereoselectivity.
  • 62
    • 0000099879 scopus 로고
    • Scheffold, R., Ed.; Salle 4- Sauerläender, Wiley: New York
    • (a) Seebach, D.; Weidmann, B.; Wilder, L. In Modern Synthetic Methods; Scheffold, R., Ed.; Salle 4- Sauerläender, Wiley: New York: 1983; Vol. 3, p 217.
    • (1983) Modern Synthetic Methods , vol.3 , pp. 217
    • Seebach, D.1    Weidmann, B.2    Wilder, L.3
  • 65
    • 1542496620 scopus 로고    scopus 로고
    • Reference 7a and references therein
    • (a) Reference 7a and references therein.
  • 66
    • 1542496622 scopus 로고    scopus 로고
    • note
    • (b) The authors have deposited atomic coordinates for the structure with the Cambridge Crystallographic Data Centre. The coordinates can be obtained, on request, from the Director. Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, UK.
  • 69
    • 2442557838 scopus 로고
    • Wiley: New York, Collect
    • (a) Kamm, O. Organic Synthesis; Wiley: New York, 1932; Collect, Vol. I, p 435.
    • (1932) Organic Synthesis , vol.1 , pp. 435
    • Kamm, O.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.