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For recent reviews on asymmetric synthesis of quaternary carbon centers see: a) M. Cristoffers, A. Mann, Angew. Chem. 2001, 113, 4725-4732; Angew. Chem. Int. Ed. 2001, 40, 4591-4597;
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For recent reviews on asymmetric synthesis of quaternary carbon centers see: a) M. Cristoffers, A. Mann, Angew. Chem. 2001, 113, 4725-4732; Angew. Chem. Int. Ed. 2001, 40, 4591-4597;
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For Lewis acid catalyzed enantioselective Mannich reactions of aldimines, see: a) H. Ishitani, M. Ueno, S. Kobayashi, J. Am. Chem. Soc. 1997, 119, 7153-7154;
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50
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0033591004
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for Lewis base catalyzed enantioselective Mannich reactions of aldimines, see k) K. Tomioka, H. Fujieda, S. Hayashi, M. A. Hussein, T. Kambara, Y. Nomura, M. Kanai, K. Koga, Chem. Commun. 1999, 715-716;
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organocatalyzed enantioselective Mannich reactions of aldimines, see: m) A. G. Wenzel, E. N. Jacobsen, J. Am. Chem. Soc. 2002, 124, 12964-12965;
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61
-
-
0347714775
-
-
note
-
2 complexed with chiral ligands of the phosphino-oxazoline-, bisoxazoline- or BINAP-types catalyzed the reaction of imine la and silylketene acetal 6a in high yields, but in general with low enantioinduction.
-
-
-
-
63
-
-
0347714776
-
-
note
-
2, the Mannich reaction of 1a with 6a proceeds in quantitative yield in less than 2 h at -78 °C.
-
-
-
-
64
-
-
0347084423
-
-
note
-
CCDC-207535 contains the supplementary crystallographic data for compound 10. These data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html (or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge, CB21EZ, UK; fax: (+44)1223-336-033; or e-mail: deposit@ccdc. cam.ac.uk).
-
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65
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0000655043
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For review, see: a) C. Girard, H. G. Kagan, Angew. Chem. 1998, 110, 3088-3127; Angew. Chem. Int. Ed. 1998, 37, 2923-2959;
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Girard, C.1
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29344449167
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For review, see: a) C. Girard, H. G. Kagan, Angew. Chem. 1998, 110, 3088-3127; Angew. Chem. Int. Ed. 1998, 37, 2923-2959;
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67
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0347084420
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(Eds.: E. N. Jacobsen, A. Pfaltz, H. Yamamoto), Springer, Berlin, Chapter 4.1
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b) H. B. Kagan, T. O. Luukas, in Comprehensive Asymmetric Catalysis (Eds.: E. N. Jacobsen, A. Pfaltz, H. Yamamoto), Springer, Berlin, 2000, Chapter 4.1, pp. 1-16.
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Kagan, H.B.1
Luukas, T.O.2
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68
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0347714773
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note
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2 for 1 h and then cooled to - 78 °C.
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69
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0347714774
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note
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CCDC-214298 contains the supplementary crystallographic data for compound 11. These data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html (or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge, CB21EZ, UK; fax: (+44)1223-336-033; or e-mail: deposit@ccdc. cam.ac.uk).
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c) M. Jiang, S. Dalgarno, C. A. Kilner, M. A. Halcrow, T. P. Kee, Polyhedron 2001, 20, 2151-2162.
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Polyhedron
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Jiang, M.1
Dalgarno, S.2
Kilner, C.A.3
Halcrow, M.A.4
Kee, T.P.5
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73
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0347084421
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note
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MS-analysis showed the existence of a 7a-Zn-OH complex in the crude product mixture.
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74
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0004133516
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Gaussian Inc., Pittsburgh PA
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Density functional theory (DFT) calculations were performed by using the Gaussian 98 software. The B3LYP method and the 6-31G(D,P) basis set were chosen. (Gaussian 98, Revision A.7, M. J. Frisch, G. W. Trucks, H. B. Schlegel, G. E. Scuseria, M. A. Robb, J. R. Cheeseman, V. G. Zakrzewski, J. A. Montgomery, Jr., R. E. Stratmann, J. C. Burant, S. Dapprich, J. M. Millam, A. D. Daniels, K. N. Kudin, M. C. Strain, O. Farkas, J. Tomasi, V. Barone, M. Cossi, R. Cammi, B. Mennucci, C. Pomelli, C. Adamo, S. Clifford, J. Ochterski, G. A. Petersson, P. Y. Ayala, Q. Cui, K. Morokuma, D. K. Malick, A. D. Rabuck, K. Raghavachari, J. B. Foresman, J. Cioslowski, J. V. Ortiz, A. G. Baboul, B. B. Stefanov, G. Liu, A. Liashenko, P. Piskorz, I. Komaromi, R. Gomperts, R. L. Martin, D. J. Fox, T. Keith, M. A. Al-Laham, C. Y. Peng, A. Nanayakkara, C. Gonzalez, M. Challacombe, P. M. W. Gill, B. Johnson, W. Chen, M. W. Wong, J. L. Andres, M. Head-Gordon, E. S. Replogle, and J. A. Pople, Gaussian Inc., Pittsburgh PA, 1998).
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Gaussian 98, Revision A.7
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Frisch, M.J.1
Trucks, G.W.2
Schlegel, H.B.3
Scuseria, G.E.4
Robb, M.A.5
Cheeseman, J.R.6
Zakrzewski, V.G.7
Montgomery Jr., J.A.8
Stratmann, R.E.9
Burant, J.C.10
Dapprich, S.11
Millam, J.M.12
Daniels, A.D.13
Kudin, K.N.14
Strain, M.C.15
Farkas, O.16
Tomasi, J.17
Barone, V.18
Cossi, M.19
Cammi, R.20
Mennucci, B.21
Pomelli, C.22
Adamo, C.23
Clifford, S.24
Ochterski, J.25
Petersson, G.A.26
Ayala, P.Y.27
Cui, Q.28
Morokuma, K.29
Malick, D.K.30
Rabuck, A.D.31
Raghavachari, K.32
Foresman, J.B.33
Cioslowski, J.34
Ortiz, J.V.35
Baboul, A.G.36
Stefanov, B.B.37
Liu, G.38
Liashenko, A.39
Piskorz, P.40
Komaromi, I.41
Gomperts, R.42
Martin, R.L.43
Fox, D.J.44
Keith, T.45
Al-Laham, M.A.46
Peng, C.Y.47
Nanayakkara, A.48
Gonzalez, C.49
Challacombe, M.50
Gill, P.M.W.51
Johnson, B.52
Chen, W.53
Wong, M.W.54
Andres, J.L.55
Head-Gordon, M.56
Replogle, E.S.57
Pople, J.A.58
more..
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75
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0346454030
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note
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Loss of optical purity was not detected throughout the transformation shown in Scheme 4.
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76
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0345822990
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note
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Example of a catalytic asymmetric allylation of a novel ketimine electrophile with intrinsic protecting group anchoring.
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77
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0027201963
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J. P. Versleijen, M. S. Sanders-Hovens, S. A. Vanhommerig, J. A. Vekemans, E. M. Meijer, Tetrahedron 1993, 49, 7793-7802.
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Tetrahedron
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Versleijen, J.P.1
Sanders-Hovens, M.S.2
Vanhommerig, S.A.3
Vekemans, J.A.4
Meijer, E.M.5
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79
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37049106801
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Y. Kita, J. Segawa, J. Haruta, H. Yasuda, Y. Tamura, J. Chem. Soc. Perkin Trans. 1 1988, 1099-1104.
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J. Chem. Soc. Perkin Trans. 1
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Kita, Y.1
Segawa, J.2
Haruta, J.3
Yasuda, H.4
Tamura, Y.5
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0001377942
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Gruber, J.M.2
Marrero, R.3
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Kim, C.W.5
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J. G. Grunwell, A. Karipides, C. T. Wigal, S. W. A. Clayton, F. J. Fleitz, M. Daffner, J. E. Stevens, J. Org. Chem. 1991, 56, 91-95.
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Daffner, M.6
Stevens, J.E.7
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