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Other examples: b) G. M. Villacorta, C. P. Rao, S. J. Lippard, J. Am. Chem. Soc. 1988, 110, 3175; c) M. van Klaveren, F. Lambert, D. J. F. M. Eijkelkamp, D. M. Grove, G. van Koten, Tetrahedron Lett. 1994, 35, 6135; d) M. Spescha, G. Rihs Helv. Chim. Acta 1993, 76, 1219.
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Van Klaveren, M.1
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84987539004
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Other examples: b) G. M. Villacorta, C. P. Rao, S. J. Lippard, J. Am. Chem. Soc. 1988, 110, 3175; c) M. van Klaveren, F. Lambert, D. J. F. M. Eijkelkamp, D. M. Grove, G. van Koten, Tetrahedron Lett. 1994, 35, 6135; d) M. Spescha, G. Rihs Helv. Chim. Acta 1993, 76, 1219.
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Helv. Chim. Acta
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b) M. Suzuki, T. Suzuki, T. Kawagishi, Y. Morita, R. Noyori, Isr. J. Chem. 1984, 24, 118;
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c) A. Alexakis, S. Mutti, J. F. Normant, J. Am. Chem. Soc. 1991, 113, 6332.
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0029044287
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Recently enantioselective 1,4-addition of Grignard reagents to cyclic enones, catalyzed by a Cul complex containing a chiral, bidentate phoshane ligand, has been reported: M. Kanai, K. Tomioka, Tetrahedron Lett. 1995, 36, 4275.
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2Zn to 3a has been reported (ee 32 %); however, with 5a no ee was found: A. Alexakis, J. Frutos, P. Mangeney, Tetrahedron: Asymmetry 1993, 4, 2427.
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For a discussion about ligand accelerated asymmetric catalysis, see D. J. Berrisford, C. Bolm, K. B. Sharpless, Angew. Chem. 1995, 107, 1159; Angew. Chem. Int. Ed. Engl. 1995, 34, 1059.
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18
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33748983103
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For a discussion about ligand accelerated asymmetric catalysis, see D. J. Berrisford, C. Bolm, K. B. Sharpless, Angew. Chem. 1995, 107, 1159; Angew. Chem. Int. Ed. Engl. 1995, 34, 1059.
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19
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85033012420
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note
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2Zn to 3a (4a: yield 76%, ee 32%).
-
-
-
-
20
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85033016770
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-
note
-
3; Z = 4. The structure was solved by direct methods and refined to R(F) = 0.120, Rw(F) = 0.131. Crystallographic data (excluding structure factors) for the structure reported in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication no. CCDC-179-114. Copies of the data can be obtained free of charge on application to The Director, CCDC, 12 Union Road, Cambridge CB2 1EZ UK (fax: int. code +(1223)336-033; e-mail: teched@chemcrys.cam.ac.uk).
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-
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22
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0026518693
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All new ligands were remarkably stable to air and fully characterized. The corresponding 3,3′-substituted 2,2′-binaphthols were synthesized according to P. J. Cox, W. Wang, V. Snieckus, Tetrahedron Lett. 1992, 33, 2253.
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D. A. Evans, J. A. Murry, P. von Matt, R. D. Norcross, S. J. Miller, Angew. Chem. 1995, 107, 864; Angew. Chem. Int. Ed. Engl. 1995, 34, 798.
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D. A. Evans, J. A. Murry, P. von Matt, R. D. Norcross, S. J. Miller, Angew. Chem. 1995, 107, 864; Angew. Chem. Int. Ed. Engl. 1995, 34, 798.
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