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34047197521
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and references therein. For others approaches for diols and polyols, see
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a) F. Freire, F. Calderón, J. M. Seco, A. Fernandez-Mayoralas, E. Quiñoá, R. Riguera, J. Org. Chem. 2007, 72, 2297-2301, and references therein. For others approaches for diols and polyols, see
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32
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77956468501
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Secondary/primary and primary/secondary (sec/prim and prim/sec) apply only to the carbon atoms to which the amino/hydroxy groups are linked. Sphingosines and epinephrines (adrenalines) are examples of compounds of biological interest that bear these substructures.
-
Secondary/primary and primary/secondary (sec/prim and prim/sec) apply only to the carbon atoms to which the amino/hydroxy groups are linked. Sphingosines and epinephrines (adrenalines) are examples of compounds of biological interest that bear these substructures.
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33
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77956478776
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Two approaches that do not make any use of δσRS from the substrate and are based on the cross-interaction between auxiliaries-just δσRS from the methoxy and methine groups of the MPAs-have been published recently. The method now described in this article is appropriate in cases in which the application of those previous approaches presents difficulties-that is, presence of extra methoxy groups in the substrate or overlapped methine signals-and is useful to double-check the configurational assignment.
-
Two approaches that do not make any use of δσRS from the substrate and are based on the cross-interaction between auxiliaries-just δσRS from the methoxy and methine groups of the MPAs-have been published recently. The method now described in this article is appropriate in cases in which the application of those previous approaches presents difficulties-that is, presence of extra methoxy groups in the substrate or overlapped methine signals-and is useful to double-check the configurational assignment.
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-
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34
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51649125972
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a) V. Leiro, J. M. Seco, E. Quinoa, R. Riguera, Org. Lett. 2008, 10, 2729-2732
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Leiro, V.1
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35
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51649089354
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b) V. Leiro, J. M. Seco, E. Quinoa, R. Riguera, Org. Lett. 2008,10, 2733-2736.
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Leiro, V.1
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Quinoa, E.3
Riguera, R.4
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36
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77956483761
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This approach avoids the use of protecting groups for the terminal primary group, thus making the experimental procedure much simpler.
-
This approach avoids the use of protecting groups for the terminal primary group, thus making the experimental procedure much simpler.
-
-
-
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37
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77956470279
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See the Supporting Information for a full explanation of the confor-mational equilibria that justifies the δσRS signs in prim/sec benzylic amino alcohols.
-
See the Supporting Information for a full explanation of the confor-mational equilibria that justifies the δσRS signs in prim/sec benzylic amino alcohols.
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-
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38
-
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77956465611
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-
The gt conformer is defined as the one in which the benzoate is gauche to the benzamide and trans to the Me (sec/prim), or the ben-zamide is gauche to the benzoate and trans to the Me (prim/sec).
-
The gt conformer is defined as the one in which the benzoate is gauche to the benzamide and trans to the Me (sec/prim), or the ben-zamide is gauche to the benzoate and trans to the Me (prim/sec).
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39
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0037124513
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J. Lindberg, S. C. Svensson, P. Phalsson, P. Konradsson, Tetrahedron 2002,58, 5109-5117.
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Lindberg, J.1
Svensson, S.C.2
Phalsson, P.3
Konradsson, P.4
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41
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0004209464
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Gaussian 03, revision E.01, Wallingford, CT
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Gaussian 03, revision E.01, M. J. Frisch, G. W. Trucks, H. B. Schlegel, G. E. Scuseria, M. A. Robb, J. R. Cheeseman, J. A. Montgomery, Jr. , T. Vreven, K. N. Kudin, J. C. Burant, J. M. Millam, S. S. Iyengar, J. Tomasi, V. Barone, B. Mennucci, M. Cossi, G. Scalmani, N. Rega, G. A. Petersson, H. Nakatsuji, M. Hada, M. Ehara, K. Toyota, R. Fukuda, J. Hasegawa, M. Ishida, T. Nakajima, Y. Honda, O. Kitao, H. Nakai, M. Klene, X. Li, J. E. Knox, H. P. Hratchian, J. B. Cross, C. Adamo, J. Jaramillo, R. Gomperts, R. E. Stratmann, O. Yazyev, A. J. Austin, R. Cammi, C. Pomelli, J. W. Ochterski, P. Y. Ayala, K. Morokuma, G. A. Voth, P. Salvador, J. J. Dannenberg, V. G. Zakr-zewski, S. Dapprich, A. D. Daniels, M. C. Strain, O. Farkas, D. K. Malick, A. D. Rabuck, K. Raghavachari, J. B. Foresman, J. V. Ortiz, Q. Cui, A. G. Baboul, S. Clifford, J. Cioslowski, B. B. Stefanov, G. Liu, A. Liashenko, P. Piskorz, I. Komaromi, R. L. Martin, D. J. Fox, T. Keith, M. A. Al-Laham, C. Y. Peng, A. Nanayakkara, M. Challa-combe, P. M. W. Gill, B. Johnson, W. Chen, M. W. Wong, C. Gonzalez, J. A. Pople, Gaussian, Inc., Wallingford, CT, 2004.
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Frisch, M.J.1
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Schlegel, H.B.3
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Robb, M.A.5
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Montgomery Jr., J.A.7
Vreven, T.8
Kudin, K.N.9
Burant, J.C.10
Millam, J.M.11
Iyengar, S.S.12
Tomasi, J.13
Barone, V.14
Mennucci, B.15
Cossi, M.16
Scalmani, G.17
Rega, N.18
Petersson, G.A.19
Nakatsuji, H.20
Hada, M.21
Ehara, M.22
Toyota, K.23
Fukuda, R.24
Hasegawa, J.25
Ishida, M.26
Nakajima, T.27
Honda, Y.28
Kitao, O.29
Nakai, H.30
Klene, M.31
Li, X.32
Knox, J.E.33
Hratchian, H.P.34
Cross, J.B.35
Adamo, C.36
Jaramillo, J.37
Gomperts, R.38
Stratmann, R.E.39
Yazyev, O.40
Austin, A.J.41
Cammi, R.42
Pomelli, C.43
Ochterski, J.W.44
Ayala, P.Y.45
Morokuma, K.46
Voth, G.A.47
Salvador, P.48
Dannenberg, J.J.49
Zakr-Zewski, V.G.50
Dapprich, S.51
Daniels, A.D.52
Strain, M.C.53
Farkas, O.54
Malick, D.K.55
Rabuck, A.D.56
Raghavachari, K.57
Foresman, J.B.58
Ortiz, J.V.59
Cui, Q.60
Baboul, A.G.61
Clifford, S.62
Cioslowski, J.63
Stefanov, B.B.64
Liu, G.65
Liashenko, A.66
Piskorz, P.67
Komaromi, I.68
Martin, R.L.69
Fox, D.J.70
Keith, T.71
Al-Laham, M.A.72
Peng, C.Y.73
Nanayakkara, A.74
Challa-Combe, M.75
Gill, P.M.W.76
Johnson, B.77
Chen, W.78
Wong, M.W.79
Gonzalez, C.80
Pople, J.A.81
more..
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77956456872
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2' bond.
-
In this case, the lowest-energy conformer arises from a I conformation for the C1-N bond combined with a gg conformer for the C1'-C2' bond.
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