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Volumn 125, Issue 3, 2003, Pages 628-629

Carbonyl-ene reactions catalyzed by bis(oxazoline) copper (II) complexes proceed by a facile stepwise mechanism: DFT and ONIOM (DFT:PM3) studies

Author keywords

[No Author keywords available]

Indexed keywords

CARBONYL DERIVATIVE; COPPER COMPLEX; OXAZOLINE DERIVATIVE;

EID: 84962424492     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja027326n     Document Type: Article
Times cited : (39)

References (52)
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    • note
    • The combination of chiral BOX ligands - Lewis acids has been used for catalytic asymmetric reactions such as aldol, Diels-Alder, 1,3-dipolar cycloadditions, cyclopropanation, allylic substitution, allylation and addition, aziridination, hetero-Diels - Alder, carbonyl-ene, Friedel - Crafts, Mannich, aza-Henry, Claisen rearrangement, and Kharasch - Sosnovsky reactions. For details, see reviews, ref 5.
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    • and references therein
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    • This DFT method has proved to be a reliable tool for the description of ene-reaction paths (a - c) and transition-metal complexes (d): (a) Pranata, J. Int. J. Quantum Chem. 1997, 62, 509-514. (b) Deng, Q.; Thomas, B. E. N.; Houk, K. N.; Dowd, P. J. Am. Chem. Soc. 1997, 119, 6902-6908. (c) Engels, B.; Musch, P. N. J. Am. Chem. Soc. 2001, 123, 5557-5562. (d) Niu, S.; Hall, M. B. Chem. Rev. 2000, 100, 353-405.
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    • This DFT method has proved to be a reliable tool for the description of ene-reaction paths (a - c) and transition-metal complexes (d): (a) Pranata, J. Int. J. Quantum Chem. 1997, 62, 509-514. (b) Deng, Q.; Thomas, B. E. N.; Houk, K. N.; Dowd, P. J. Am. Chem. Soc. 1997, 119, 6902-6908. (c) Engels, B.; Musch, P. N. J. Am. Chem. Soc. 2001, 123, 5557-5562. (d) Niu, S.; Hall, M. B. Chem. Rev. 2000, 100, 353-405.
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    • This DFT method has proved to be a reliable tool for the description of ene-reaction paths (a - c) and transition-metal complexes (d): (a) Pranata, J. Int. J. Quantum Chem. 1997, 62, 509-514. (b) Deng, Q.; Thomas, B. E. N.; Houk, K. N.; Dowd, P. J. Am. Chem. Soc. 1997, 119, 6902-6908. (c) Engels, B.; Musch, P. N. J. Am. Chem. Soc. 2001, 123, 5557-5562. (d) Niu, S.; Hall, M. B. Chem. Rev. 2000, 100, 353-405.
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    • This DFT method has proved to be a reliable tool for the description of ene-reaction paths (a - c) and transition-metal complexes (d): (a) Pranata, J. Int. J. Quantum Chem. 1997, 62, 509-514. (b) Deng, Q.; Thomas, B. E. N.; Houk, K. N.; Dowd, P. J. Am. Chem. Soc. 1997, 119, 6902-6908. (c) Engels, B.; Musch, P. N. J. Am. Chem. Soc. 2001, 123, 5557-5562. (d) Niu, S.; Hall, M. B. Chem. Rev. 2000, 100, 353-405.
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    • Hypercube, Inc.: Gainesville, FL
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    • For theoretical studies of other 4-catalyzed reactions see: (a) Brandt, P.; Sodergren, M. J.; Andersson, P. G.; Norrby, P.-O. J. Am. Chem. Soc. 2000, 122, 8013-8020. (b) Fraile, J. M.; Garcia, J. I.; Martinez-Merino, V.; Mayoral, J. A.; Salvatella, L. J. Am. Chem. Soc. 2001, 123, 7616-7625.
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    • note
    • For all total energies, ball-and-stick structures, and Cartesian coordinates (endo and exo approaches) at both levels of theory see Supporting Information. The uncatalyzed reaction mechanism is a concerted pericyclic pathway with no energetic preference between endo and exo approaches (see Supporting Information).
  • 45
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    • note
    • 2O were omitted in our study of the potential energy surface as the bis(aquo) catalyst yields the same efficiency and stereochemical results as the anhydrous catalyst (see ref 7).
  • 52
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    • note
    • We denote endo and exo approaches as those in which the substituent of the reactive carbonyl group and the central carbon of the allyl group are in a cis and trans relationship, respectively.


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