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Volumn , Issue 5, 2003, Pages 663-666

[2,3]-Wittig sigmatropic rearrangement of γ-allyloxy-β-enaminoesters

Author keywords

Lactones; Lithiation; Wittig rearrangement; enaminoesters; ketoesters

Indexed keywords

5 ALLYL 4 (BENZYLAMINO)FURAN 2(5H) ONE; ALLYL COMPOUND; ESTER; ETHYL 4 (ALLYLOXY) 3 (BENZYLAMINO)BUT 2 ENOATE; KETONE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0037270110     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2003-38362     Document Type: Article
Times cited : (9)

References (51)
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    • 4 is well-documented, the double metalation of primary or secondary ones has not been reported to our knowledge. See: (a) Schlessinger, R. H.; Iwanowicz, E. J.; Springer, J. P. J. Org. Chem. 1986, 51, 3073. (b) Schlessinger, R. H.; Li, Y.-J.; Von Langen, D. J. J. Org. Chem. 1996, 61, 3226. (c) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1996, 37, 1331. (d) Dankwardt, J. W.; Dankwardt, S. M.; Schlessinger, R. H. Tetrahedron Lett. 1998, 39, 4983. (e) Schlessinger, R. H.; Pettus, L. H. J. Org. Chem. 1998, 63, 9089. (f) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1999, 40, 1257.
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    • 4 is well-documented, the double metalation of primary or secondary ones has not been reported to our knowledge. See: (a) Schlessinger, R. H.; Iwanowicz, E. J.; Springer, J. P. J. Org. Chem. 1986, 51, 3073. (b) Schlessinger, R. H.; Li, Y.-J.; Von Langen, D. J. J. Org. Chem. 1996, 61, 3226. (c) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1996, 37, 1331. (d) Dankwardt, J. W.; Dankwardt, S. M.; Schlessinger, R. H. Tetrahedron Lett. 1998, 39, 4983. (e) Schlessinger, R. H.; Pettus, L. H. J. Org. Chem. 1998, 63, 9089. (f) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1999, 40, 1257.
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    • 4 is well-documented, the double metalation of primary or secondary ones has not been reported to our knowledge. See: (a) Schlessinger, R. H.; Iwanowicz, E. J.; Springer, J. P. J. Org. Chem. 1986, 51, 3073. (b) Schlessinger, R. H.; Li, Y.-J.; Von Langen, D. J. J. Org. Chem. 1996, 61, 3226. (c) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1996, 37, 1331. (d) Dankwardt, J. W.; Dankwardt, S. M.; Schlessinger, R. H. Tetrahedron Lett. 1998, 39, 4983. (e) Schlessinger, R. H.; Pettus, L. H. J. Org. Chem. 1998, 63, 9089. (f) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1999, 40, 1257.
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    • 4 is well-documented, the double metalation of primary or secondary ones has not been reported to our knowledge. See: (a) Schlessinger, R. H.; Iwanowicz, E. J.; Springer, J. P. J. Org. Chem. 1986, 51, 3073. (b) Schlessinger, R. H.; Li, Y.-J.; Von Langen, D. J. J. Org. Chem. 1996, 61, 3226. (c) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1996, 37, 1331. (d) Dankwardt, J. W.; Dankwardt, S. M.; Schlessinger, R. H. Tetrahedron Lett. 1998, 39, 4983. (e) Schlessinger, R. H.; Pettus, L. H. J. Org. Chem. 1998, 63, 9089. (f) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1999, 40, 1257.
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  • 35
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    • 4 is well-documented, the double metalation of primary or secondary ones has not been reported to our knowledge. See: (a) Schlessinger, R. H.; Iwanowicz, E. J.; Springer, J. P. J. Org. Chem. 1986, 51, 3073. (b) Schlessinger, R. H.; Li, Y.-J.; Von Langen, D. J. J. Org. Chem. 1996, 61, 3226. (c) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1996, 37, 1331. (d) Dankwardt, J. W.; Dankwardt, S. M.; Schlessinger, R. H. Tetrahedron Lett. 1998, 39, 4983. (e) Schlessinger, R. H.; Pettus, L. H. J. Org. Chem. 1998, 63, 9089. (f) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1999, 40, 1257.
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  • 36
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    • 4 is well-documented, the double metalation of primary or secondary ones has not been reported to our knowledge. See: (a) Schlessinger, R. H.; Iwanowicz, E. J.; Springer, J. P. J. Org. Chem. 1986, 51, 3073. (b) Schlessinger, R. H.; Li, Y.-J.; Von Langen, D. J. J. Org. Chem. 1996, 61, 3226. (c) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1996, 37, 1331. (d) Dankwardt, J. W.; Dankwardt, S. M.; Schlessinger, R. H. Tetrahedron Lett. 1998, 39, 4983. (e) Schlessinger, R. H.; Pettus, L. H. J. Org. Chem. 1998, 63, 9089. (f) Schlessinger, R. H.; Gillman, K. W. Tetrahedron Lett. 1999, 40, 1257.
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    • note
    • Due to their moderate stability on silica gel, the β-enamino-esters 5a-c and 8 were conveniently engaged in the rearrangement step without further purification and therefore an excess of n-BuLi (4 equiv) was routinely used in order to ensure an efficient metalation process of these crude compounds at -78°C. The nucleophilic addition of n-BuLl to the ester carbonyl group of lithiated β-enamino-esters, and/or N,O-dilithiated β-enaminoesters arising from the [2,3]-sigmatropic rearrangement, has never been observed as a side reaction. The fact that these species may be considered as vinylogous lithiated carbamates probably accounts for their low reactivity towards n-BuLi.
  • 38
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    • 6
  • 39
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    • 1a
  • 40
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    • General reviews on the [2,3]-Wittig rearrangement: (a) Nakai, T.; Mikami, K. Chem. Rev. 1986, 86, 885. (b) Marshall, J. A. In Comprehensive Organic Chemistry, Vol. 3; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: Oxford, 1991, 975-1014. (c) Brückner, R. In Comprehensive Organic Chemistry, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: Oxford, 1991, 873-907. (d) Kallmerten, J. In Houben-Weyl, Methods of Organic Chemistry, Vol. E 21d; Helmchen, G.; Hoffmann, R. W.; Mulzer, J.; Schaumann, E., Eds.; Thieme-Verlag: Stuttgart, 1995, 3757-3809.
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    • General reviews on the [2,3]-Wittig rearrangement: (a) Nakai, T.; Mikami, K. Chem. Rev. 1986, 86, 885. (b) Marshall, J. A. In Comprehensive Organic Chemistry, Vol. 3; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: Oxford, 1991, 975-1014. (c) Brückner, R. In Comprehensive Organic Chemistry, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: Oxford, 1991, 873-907. (d) Kallmerten, J. In Houben-Weyl, Methods of Organic Chemistry, Vol. E 21d; Helmchen, G.; Hoffmann, R. W.; Mulzer, J.; Schaumann, E., Eds.; Thieme-Verlag: Stuttgart, 1995, 3757-3809.
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    • General reviews on the [2,3]-Wittig rearrangement: (a) Nakai, T.; Mikami, K. Chem. Rev. 1986, 86, 885. (b) Marshall, J. A. In Comprehensive Organic Chemistry, Vol. 3; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: Oxford, 1991, 975-1014. (c) Brückner, R. In Comprehensive Organic Chemistry, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: Oxford, 1991, 873-907. (d) Kallmerten, J. In Houben-Weyl, Methods of Organic Chemistry, Vol. E 21d; Helmchen, G.; Hoffmann, R. W.; Mulzer, J.; Schaumann, E., Eds.; Thieme-Verlag: Stuttgart, 1995, 3757-3809.
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    • General reviews on the [2,3]-Wittig rearrangement: (a) Nakai, T.; Mikami, K. Chem. Rev. 1986, 86, 885. (b) Marshall, J. A. In Comprehensive Organic Chemistry, Vol. 3; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: Oxford, 1991, 975-1014. (c) Brückner, R. In Comprehensive Organic Chemistry, Vol. 6; Trost, B. M.; Fleming, I., Eds.; Pergamon Press: Oxford, 1991, 873-907. (d) Kallmerten, J. In Houben-Weyl, Methods of Organic Chemistry, Vol. E 21d; Helmchen, G.; Hoffmann, R. W.; Mulzer, J.; Schaumann, E., Eds.; Thieme-Verlag: Stuttgart, 1995, 3757-3809.
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    • Kallmerten, J.1


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