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Volumn 18, Issue 23, 1999, Pages 4718-4723

Asymmetric palladium-catalyzed allylic alkylation using bis(oxazoline) ligands: Phenomenal reversal of enantioselectivity with a single chiral backbone

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EID: 0001474794     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om990437j     Document Type: Article
Times cited : (54)

References (43)
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    • For the recent use of the bis(oxazoline) ligands in the asymmetric catalysis see: (a) Evans, D. A.; Kozlowski, M. C.; Murry, J. A.; Burgey, C. S.; Campos, K. R.; Connell, B. T.; Staples, R. J. J. Am. Chem. Soc. 1999, 121, 669. (b) Evans, D. A.; Burgey, C. S.; Kozlowski, M. C.; Tregay, S. W. J. Am. Chem. Soc. 1999, 121, 686. (c) Ghosh, A. K.; Mathivanan, P.; Cappiello, J. Tetrahedron: Asymmetry 1998, 9, 1-45. (d) Yao, S.; Johannsen, M.; Audrain, H.; Hazell, R. G.; Jørgensen, K. A. J. Am. Chem. Soc. 1998, 120, 8599. (e) Yao, S.; Johannsen, M.; Audrain, H.; Hazell, R. G.; Jørgensen, K. A. Angew. Chem. Int. Ed. Engl. 1998, 37, 3121. (f) Schulze, V.; Hoffmann, R. W. Chem. Eur. J. 1999, 5, 337.
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    • For the recent use of the bis(oxazoline) ligands in the asymmetric catalysis see: (a) Evans, D. A.; Kozlowski, M. C.; Murry, J. A.; Burgey, C. S.; Campos, K. R.; Connell, B. T.; Staples, R. J. J. Am. Chem. Soc. 1999, 121, 669. (b) Evans, D. A.; Burgey, C. S.; Kozlowski, M. C.; Tregay, S. W. J. Am. Chem. Soc. 1999, 121, 686. (c) Ghosh, A. K.; Mathivanan, P.; Cappiello, J. Tetrahedron: Asymmetry 1998, 9, 1-45. (d) Yao, S.; Johannsen, M.; Audrain, H.; Hazell, R. G.; Jørgensen, K. A. J. Am. Chem. Soc. 1998, 120, 8599. (e) Yao, S.; Johannsen, M.; Audrain, H.; Hazell, R. G.; Jørgensen, K. A. Angew. Chem. Int. Ed. Engl. 1998, 37, 3121. (f) Schulze, V.; Hoffmann, R. W. Chem. Eur. J. 1999, 5, 337.
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    • Reversal in enantioselectivity with bis(oxazoline)-metal catalysts depending on the oxazoline ring substituent was very recently observed in other reactions see: (a) Evans, D. A.; Johnson, J. S.; Burgey, C. S.; Campos, K. R. Tetrahedron Lett. 1999, 40, 2879. (b) Johannsen, M.; Jørgensen, K. A. J. Org. Chem. 1995, 60, 5757. (c) Johannsen, M.; Yao, S.; Jørgensen, K. A. Chem. Commun. 1997, 2169. (d) Johannsen, M.; Yao, S.; Graven, A.; Jørgensen, K. A. Pure Appl. Chem. 1998, 70, 1117.
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    • Reversal in enantioselectivity with bis(oxazoline)-metal catalysts depending on the oxazoline ring substituent was very recently observed in other reactions see: (a) Evans, D. A.; Johnson, J. S.; Burgey, C. S.; Campos, K. R. Tetrahedron Lett. 1999, 40, 2879. (b) Johannsen, M.; Jørgensen, K. A. J. Org. Chem. 1995, 60, 5757. (c) Johannsen, M.; Yao, S.; Jørgensen, K. A. Chem. Commun. 1997, 2169. (d) Johannsen, M.; Yao, S.; Graven, A.; Jørgensen, K. A. Pure Appl. Chem. 1998, 70, 1117.
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    • Reversal in enantioselectivity with bis(oxazoline)-metal catalysts depending on the oxazoline ring substituent was very recently observed in other reactions see: (a) Evans, D. A.; Johnson, J. S.; Burgey, C. S.; Campos, K. R. Tetrahedron Lett. 1999, 40, 2879. (b) Johannsen, M.; Jørgensen, K. A. J. Org. Chem. 1995, 60, 5757. (c) Johannsen, M.; Yao, S.; Jørgensen, K. A. Chem. Commun. 1997, 2169. (d) Johannsen, M.; Yao, S.; Graven, A.; Jørgensen, K. A. Pure Appl. Chem. 1998, 70, 1117.
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    • Reversal in enantioselectivity with bis(oxazoline)-metal catalysts depending on the oxazoline ring substituent was very recently observed in other reactions see: (a) Evans, D. A.; Johnson, J. S.; Burgey, C. S.; Campos, K. R. Tetrahedron Lett. 1999, 40, 2879. (b) Johannsen, M.; Jørgensen, K. A. J. Org. Chem. 1995, 60, 5757. (c) Johannsen, M.; Yao, S.; Jørgensen, K. A. Chem. Commun. 1997, 2169. (d) Johannsen, M.; Yao, S.; Graven, A.; Jørgensen, K. A. Pure Appl. Chem. 1998, 70, 1117.
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    • note
    • Complete decomposition of the catalyst was observed when the dimethyl malonate anion was added.
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    • note
    • For the preparation of the (π-allyl)-palladium-ligand complexes 7 and 8 see: refs 9c and 3.
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    • 2 was prepared according to Bosnich's procedure; see: (a) Auburn, P. R.; Mackenzie, P. B.; Bosnich, B. J. Am. Chem. Soc. 1985, 107, 2033. (b) Mackenzie, P. B.; Whelan, J.; Bosnich, B. J. Am. Chem. Soc. 1985, 107, 2046.
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    • 2 was prepared according to Bosnich's procedure; see: (a) Auburn, P. R.; Mackenzie, P. B.; Bosnich, B. J. Am. Chem. Soc. 1985, 107, 2033. (b) Mackenzie, P. B.; Whelan, J.; Bosnich, B. J. Am. Chem. Soc. 1985, 107, 2046.
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