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0013120831
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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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32
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0000437647
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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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Schlessinger, R.H.1
Li, Y.-J.2
Von Langen, D.J.3
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33
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-
0029930188
-
-
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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Schlessinger, R.H.1
Gillman, K.W.2
-
34
-
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0032500068
-
-
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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Tetrahedron Lett.
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Dankwardt, J.W.1
Dankwardt, S.M.2
Schlessinger, R.H.3
-
35
-
-
0031735186
-
-
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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Schlessinger, R.H.1
Pettus, L.H.2
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36
-
-
0033547991
-
-
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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Schlessinger, R.H.1
Gillman, K.W.2
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37
-
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0013072550
-
-
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
-
-
0013122805
-
-
note
-
6
-
-
-
-
39
-
-
85087538595
-
-
note
-
1a
-
-
-
-
40
-
-
33845376296
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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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