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Pardo, C.5
Sáez, E.6
Torres, M.R.7
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76
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0000521341
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For the metal-catalyzed regioselective synthesis of these heterocycles from propargylic N-hydroxylamines see: P. Aschwanden, D. E. Frantz, E. M. Carreira, Org. Lett. 2000, 2, 2331-2333
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For the metal-catalyzed regioselective synthesis of these heterocycles from propargylic N-hydroxylamines see: P. Aschwanden, D. E. Frantz, E. M. Carreira, Org. Lett. 2000, 2, 2331-2333.
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77
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0026567914
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The 1,3-DCR of nitrones and conjugated alkynes usually affords mixtures of both regioisomers. For a discussion see: H. G. Aurich, M. Franzke, H. P. Kesselheim, M. Rohr, Tetrahedron 1992, 48, 669-682.
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The 1,3-DCR of nitrones and conjugated alkynes usually affords mixtures of both regioisomers. For a discussion see: H. G. Aurich, M. Franzke, H. P. Kesselheim, M. Rohr, Tetrahedron 1992, 48, 669-682.
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78
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0001571279
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a) J. D. White, R. A. Badger, H. S. Kezar III, A. J. Pallenberg, G. A. Schiehser, Tetrahedron 1989, 45, 6631-6644;
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(1989)
Tetrahedron
, vol.45
, pp. 6631-6644
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White, J.D.1
Badger, R.A.2
Kezar III, H.S.3
Pallenberg, A.J.4
Schiehser, G.A.5
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79
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0034693123
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low diastereoselectivity was also found in the 1,3-DCR of a chiral erythrulose-derived nitrone and ethyl propiolate in refluxing toluene: M. Carda, R. Portolés, J. Murga, S. Uriel, J. A. Marco, L. R. Domingo, R. J. Zaragoza, H. Röper, J. Org. Chem. 2000, 65, 7000-7009.
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b) low diastereoselectivity was also found in the 1,3-DCR of a chiral erythrulose-derived nitrone and ethyl propiolate in refluxing toluene: M. Carda, R. Portolés, J. Murga, S. Uriel, J. A. Marco, L. R. Domingo, R. J. Zaragoza, H. Röper, J. Org. Chem. 2000, 65, 7000-7009.
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80
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34250305875
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At this stage of the work, we have not a clear answer to explain this selectivity profile. We are working on this issue in our group with more examples of carbohydrate-containing nitrones to see the possible generality of this effect. The results of this study will be published at due time elsewhere
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At this stage of the work, we have not a clear answer to explain this selectivity profile. We are working on this issue in our group with more examples of carbohydrate-containing nitrones to see the possible generality of this effect. The results of this study will be published at due time elsewhere.
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81
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34250342148
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[17] a poor dipolarophile and an excellent precursor of phosphorous-containing allylic anions IV (see Scheme 2).
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[17] a poor dipolarophile and an excellent precursor of phosphorous-containing allylic anions IV (see Scheme 2).
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82
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22244463229
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The electronic difference between both heteroatoms usually determines the chemical reactivity of the allenolates and as a consequence, the chemical outcome of the catalytic process. For a recent example see: Y, Ling, M. Shi, Org. Lett. 2005, 7, 3057-3060. For other examples see reference [17
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The electronic difference between both heteroatoms usually determines the chemical reactivity of the allenolates and as a consequence, the chemical outcome of the catalytic process. For a recent example see: Y. -Ling, M. Shi, Org. Lett. 2005, 7, 3057-3060. For other examples see reference [17].
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