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(b) For total syntheses of tabersonine and other Aspidosperma alkaloids, see: S. A. Kozmin, T. Iwama, Y Huang and V. H. Rawal, J. Am. Chem. Soc., 2002, 124, 4628.
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See also: (a) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg and M. Beller, J. Am. Chem. Soc., 2001, 123, 8398; (b) A. Jacobi von Wangelin, H. Neumann, D. Gördes, A. Spannenberg and M. Beller, Org. Lett., 2001, 3, 2895; (c) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg, W. Baumann and M. Beller, Tetrahedron, 2002, 58, 2381; (d) H. Neumann, A. Jacobi von Wangelin, S. Klaus, D. Strübing, D. Gördes and M. Beller, Angew. Chem., Int. Ed., 2003, 42, 4503; (e) A. Jacobi von Wangelin, H. Neumann, D. Gördes, S. Klaus, H. Jiao, A. Spannenberg, M. Beller, T. Krüger, C. Wendler, K. Thurow and N. Stoll, Chem. Eur. J., 2003, 9, 2273.
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Neumann, H.1
Jacobi von Wangelin, A.2
Gördes, D.3
Spannenberg, A.4
Beller, M.5
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See also: (a) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg and M. Beller, J. Am. Chem. Soc., 2001, 123, 8398; (b) A. Jacobi von Wangelin, H. Neumann, D. Gördes, A. Spannenberg and M. Beller, Org. Lett., 2001, 3, 2895; (c) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg, W. Baumann and M. Beller, Tetrahedron, 2002, 58, 2381; (d) H. Neumann, A. Jacobi von Wangelin, S. Klaus, D. Strübing, D. Gördes and M. Beller, Angew. Chem., Int. Ed., 2003, 42, 4503; (e) A. Jacobi von Wangelin, H. Neumann, D. Gördes, S. Klaus, H. Jiao, A. Spannenberg, M. Beller, T. Krüger, C. Wendler, K. Thurow and N. Stoll, Chem. Eur. J., 2003, 9, 2273.
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Org. Lett.
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Jacobi von Wangelin, A.1
Neumann, H.2
Gördes, D.3
Spannenberg, A.4
Beller, M.5
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See also: (a) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg and M. Beller, J. Am. Chem. Soc., 2001, 123, 8398; (b) A. Jacobi von Wangelin, H. Neumann, D. Gördes, A. Spannenberg and M. Beller, Org. Lett., 2001, 3, 2895; (c) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg, W. Baumann and M. Beller, Tetrahedron, 2002, 58, 2381; (d) H. Neumann, A. Jacobi von Wangelin, S. Klaus, D. Strübing, D. Gördes and M. Beller, Angew. Chem., Int. Ed., 2003, 42, 4503; (e) A. Jacobi von Wangelin, H. Neumann, D. Gördes, S. Klaus, H. Jiao, A. Spannenberg, M. Beller, T. Krüger, C. Wendler, K. Thurow and N. Stoll, Chem. Eur. J., 2003, 9, 2273.
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Tetrahedron
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Neumann, H.1
Jacobi von Wangelin, A.2
Gördes, D.3
Spannenberg, A.4
Baumann, W.5
Beller, M.6
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27
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See also: (a) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg and M. Beller, J. Am. Chem. Soc., 2001, 123, 8398; (b) A. Jacobi von Wangelin, H. Neumann, D. Gördes, A. Spannenberg and M. Beller, Org. Lett., 2001, 3, 2895; (c) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg, W. Baumann and M. Beller, Tetrahedron, 2002, 58, 2381; (d) H. Neumann, A. Jacobi von Wangelin, S. Klaus, D. Strübing, D. Gördes and M. Beller, Angew. Chem., Int. Ed., 2003, 42, 4503; (e) A. Jacobi von Wangelin, H. Neumann, D. Gördes, S. Klaus, H. Jiao, A. Spannenberg, M. Beller, T. Krüger, C. Wendler, K. Thurow and N. Stoll, Chem. Eur. J., 2003, 9, 2273.
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Angew. Chem., Int. Ed.
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Neumann, H.1
Jacobi von Wangelin, A.2
Klaus, S.3
Strübing, D.4
Gördes, D.5
Beller, M.6
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28
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0038509974
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See also: (a) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg and M. Beller, J. Am. Chem. Soc., 2001, 123, 8398; (b) A. Jacobi von Wangelin, H. Neumann, D. Gördes, A. Spannenberg and M. Beller, Org. Lett., 2001, 3, 2895; (c) H. Neumann, A. Jacobi von Wangelin, D. Gördes, A. Spannenberg, W. Baumann and M. Beller, Tetrahedron, 2002, 58, 2381; (d) H. Neumann, A. Jacobi von Wangelin, S. Klaus, D. Strübing, D. Gördes and M. Beller, Angew. Chem., Int. Ed., 2003, 42, 4503; (e) A. Jacobi von Wangelin, H. Neumann, D. Gördes, S. Klaus, H. Jiao, A. Spannenberg, M. Beller, T. Krüger, C. Wendler, K. Thurow and N. Stoll, Chem. Eur. J., 2003, 9, 2273.
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Chem. Eur. J.
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Jacobi von Wangelin, A.1
Neumann, H.2
Gördes, D.3
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Jiao, H.5
Spannenberg, A.6
Beller, M.7
Krüger, T.8
Wendler, C.9
Thurow, K.10
Stoll, N.11
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(a) M. Beller and M. Eckert, Angew. Chem., Int. Ed., 2000, 39, 1010;
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Angew. Chem., Int. Ed.
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(b) M. Beller, M. Eckert, H. Geissler, B. Napierski, H.-P. Rebenstock and E. W. Holla, Chem. Eur. J., 1998, 4, 935;
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(c) M. Beller, M. Eckert, F. Vollmüller, S. Bogdanovic and H. Geissler, Angew. Chem., Int. Ed., 1997, 36, 1494;
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(d) M. Beller, M. Eckert, W. Moradi and H. Neumann, Angew. Chem., Int. Ed., 1999, 38, 1454.
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D. Gördes, H. Neumann, A. Jacobi von Wangelin, C. Fischer, K. Drauz, H.-P. Krimmer and M. Beller, Adv. Synth. Catal, 2003, 345, 510.
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Adv. Synth. Catal
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A. Jacobi von Wangelin, H. Neumann, D. Gördes, S. Klaus, D. Strübing and M. Beller, Chem. Eur. J., 2003, 9, 4283.
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Chem. Eur. J.
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Jacobi von Wangelin, A.1
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Klaus, S.4
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Beller, M.6
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35
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1842502135
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PhD thesis, Universität Rostock
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For synthesis and characterization of other amide-aldehyde adducts, see: (a) A. Jacobi von Wangelin, PhD thesis, Universität Rostock, 2002; (b) D. Gördes, PhD thesis, Universität Rostock, 2002.
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(2002)
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Jacobi von Wangelin, A.1
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PhD thesis, Universität Rostock
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For synthesis and characterization of other amide-aldehyde adducts, see: (a) A. Jacobi von Wangelin, PhD thesis, Universität Rostock, 2002; (b) D. Gördes, PhD thesis, Universität Rostock, 2002.
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(2002)
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Gördes, D.1
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1842502134
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note
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All geometries were first optimized at the ab initio HF/3-21G level of theory and then refined at the B3LYP/6-31G(d) density functional level of theory. Optimized stationary points on the potential energy surface were characterized as energy minima with only real frequencies order, transition state with only one imaginary frequency at the HF/3-21G level. This frequency calculation provides also the zero-point energies (ZPE, scaled by 0.89) for correcting the calculated relative energies. The final energies for discussion are the single-point energies at the B3LYP/6-311+G(d,p) level with the B3LYP/6-31G(d) geometries, including the ZPE corrections. All calculations were performed using the Gaussian 98 program. For further details, see Supporting Information of ref. 8a.
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41
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1842554383
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note
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Although thermodynamics favor isopropyl-substituted aminodiene 3 in its 1Z-isomeric form, multicomponent Diels-Alder additions to maleimide resulted in the exclusive formation of the all-syn product, thus testifying to the kinetic preference for the 1E-aminodiene. See also ref. 8a.
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42
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note
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13C NMR experiments were performed at 25°C. For details, see Experimental section.
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