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0001255775
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Methods that use ≥ 1 equiv of chiral ligand in the enantioselective alkylation of α-ketoesters have been developed, but few (see 4e) are synthetically useful, (a) Abenhaim, D.; Boireau, G.; Sabourault, B. Tetrahedron Lett. 1980, 21, 3043-3046. (b) Noyori, R.; Suga, S.; Kawai, K.; Okada, S.; Kitamura, M. Pure Appl. Chem. 1988, 60, 1597-1606. (c) Weber, B.; Seebach, D. Tetrahedron 1994, 50, 6117-6128. Zadel, G.; Breitmaier, E. Chem. Ber. 1994, 127, 1323-1326. (e) Yamada, K.; Tozawa, T.; Nishida, M.; Mukaiyama, T. Bull. Chem. Soc. Jpn. 1997, 70, 2301-2308. (f) Tan, L.; Chen, C.; Tillyer, R. D.; Grabowski, E. J. J.; Reider, P. J. Angew. Chem., Int. Ed. 1999, 38, 711-713.
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Yamada, K.1
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Mukaiyama, T.4
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16
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0033105506
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Methods that use ≥ 1 equiv of chiral ligand in the enantioselective alkylation of α-ketoesters have been developed, but few (see 4e) are synthetically useful, (a) Abenhaim, D.; Boireau, G.; Sabourault, B. Tetrahedron Lett. 1980, 21, 3043-3046. (b) Noyori, R.; Suga, S.; Kawai, K.; Okada, S.; Kitamura, M. Pure Appl. Chem. 1988, 60, 1597-1606. (c) Weber, B.; Seebach, D. Tetrahedron 1994, 50, 6117-6128. Zadel, G.; Breitmaier, E. Chem. Ber. 1994, 127, 1323-1326. (e) Yamada, K.; Tozawa, T.; Nishida, M.; Mukaiyama, T. Bull. Chem. Soc. Jpn. 1997, 70, 2301-2308. (f) Tan, L.; Chen, C.; Tillyer, R. D.; Grabowski, E. J. J.; Reider, P. J. Angew. Chem., Int. Ed. 1999, 38, 711-713.
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Mukaiyama aldol: (a) Evans, D. A.; Burgey, C. S.; Kozlowski, M. C.; Tregay, S. W. J. Am. Chem. Soc. 1999, 121, 686-699. Isocyanoacetates: (b) Ito, Y.; Sawamura, M.; Hamashima, H.; Emura, T.; Hayashi, T. Tetrahedron Lett. 1989, 30, 4681-4684. Self-aldol: Juhl, K.; Gathergood, N.; Jorgensen, K. A. J. Chem. Soc., Chem. Commun. 2000, 2211-2212. [2 + 2]-Cycloaddition: Evans, D. A.; Janey, J. M. Org. Lett. 2001, 3, 2125-2128. Hetero-Diels-Alder: (e) Ghosh, A. K.; Shirai, M. Tetrahedron Lett. 2001, 42, 6231-6233. Friedel-Crafts: (f) Jensen, K. B.; Thorbauge, J.; Hazell, R. G.; Jorgensen, K. A. Angew. Chem., Int. Ed. 2001, 40, 160-163.
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19
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0034700224
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Mukaiyama aldol: (a) Evans, D. A.; Burgey, C. S.; Kozlowski, M. C.; Tregay, S. W. J. Am. Chem. Soc. 1999, 121, 686-699. Isocyanoacetates: (b) Ito, Y.; Sawamura, M.; Hamashima, H.; Emura, T.; Hayashi, T. Tetrahedron Lett. 1989, 30, 4681-4684. Self-aldol: Juhl, K.; Gathergood, N.; Jorgensen, K. A. J. Chem. Soc., Chem. Commun. 2000, 2211-2212. [2 + 2]-Cycloaddition: Evans, D. A.; Janey, J. M. Org. Lett. 2001, 3, 2125-2128. Hetero-Diels-Alder: (e) Ghosh, A. K.; Shirai, M. Tetrahedron Lett. 2001, 42, 6231-6233. Friedel-Crafts: (f) Jensen, K. B.; Thorbauge, J.; Hazell, R. G.; Jorgensen, K. A. Angew. Chem., Int. Ed. 2001, 40, 160-163.
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0001320447
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Mukaiyama aldol: (a) Evans, D. A.; Burgey, C. S.; Kozlowski, M. C.; Tregay, S. W. J. Am. Chem. Soc. 1999, 121, 686-699. Isocyanoacetates: (b) Ito, Y.; Sawamura, M.; Hamashima, H.; Emura, T.; Hayashi, T. Tetrahedron Lett. 1989, 30, 4681-4684. Self-aldol: Juhl, K.; Gathergood, N.; Jorgensen, K. A. J. Chem. Soc., Chem. Commun. 2000, 2211-2212. [2 + 2]-Cycloaddition: Evans, D. A.; Janey, J. M. Org. Lett. 2001, 3, 2125-2128. Hetero-Diels-Alder: (e) Ghosh, A. K.; Shirai, M. Tetrahedron Lett. 2001, 42, 6231-6233. Friedel-Crafts: (f) Jensen, K. B.; Thorbauge, J.; Hazell, R. G.; Jorgensen, K. A. Angew. Chem., Int. Ed. 2001, 40, 160-163.
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Ghosh, A.K.1
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Mukaiyama aldol: (a) Evans, D. A.; Burgey, C. S.; Kozlowski, M. C.; Tregay, S. W. J. Am. Chem. Soc. 1999, 121, 686-699. Isocyanoacetates: (b) Ito, Y.; Sawamura, M.; Hamashima, H.; Emura, T.; Hayashi, T. Tetrahedron Lett. 1989, 30, 4681-4684. Self-aldol: Juhl, K.; Gathergood, N.; Jorgensen, K. A. J. Chem. Soc., Chem. Commun. 2000, 2211-2212. [2 + 2]-Cycloaddition: Evans, D. A.; Janey, J. M. Org. Lett. 2001, 3, 2125-2128. Hetero-Diels-Alder: (e) Ghosh, A. K.; Shirai, M. Tetrahedron Lett. 2001, 42, 6231-6233. Friedel-Crafts: (f) Jensen, K. B.; Thorbauge, J.; Hazell, R. G.; Jorgensen, K. A. Angew. Chem., Int. Ed. 2001, 40, 160-163.
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For reviews, see: (a) Pu, L.; Yu, H.-B. Chem. Rev. 2001, 101, 757-824. (b) Soai, K.; Shibata, T. In Comprehensive Asymmetric Catalysis; Jacobsen, E. N., Pfalts, A., Yamamoto, H., Eds.; Springer: Berlin, 1999; pp 911-922.
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2Zn: (b) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651-5666. Garcia, C.; LaRochelle, L. K.; Walsh, P. J. J. Am. Chem. Soc. 2002, 124, 10970-10971.
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2Zn: (b) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651-5666. Garcia, C.; LaRochelle, L. K.; Walsh, P. J. J. Am. Chem. Soc. 2002, 124, 10970-10971.
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2Zn: (b) Ramon, D. J.; Yus, M. Tetrahedron 1998, 54, 5651-5666. Garcia, C.; LaRochelle, L. K.; Walsh, P. J. J. Am. Chem. Soc. 2002, 124, 10970-10971.
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0442265266
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note
-
For an example of this problem, see ref 3a. Diastereoselective additions to α-ketoesters are often limited to MeMgX and ArMgX which do not contain β-hydrogens (see ref 3b-d).
-
-
-
-
31
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0442263721
-
-
note
-
We had found that bifunctional Lewis acid-Lewis base salen catalysts were much more reactive compared to the Noyori DAIB catalysts (see ref 9). Under comparable conditions, these salen catalysts have among the fastest rates (catalytic in titanium) for the enantioselective addition of dialkylzincs to aldehydes. Separation of the Lewis acid and Lewis base sites in these salen catalysts, which is not possible in the DAIB-type catalyst, is proposed to account for these rate differences
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32
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0030767708
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(a) Jiang, Y.; Gong, L.; Feng, X.; Hu, W.; Pan, W.; Li, Z.; Mi, A. Tetrahedron, 1997, 53, 14327-14338.
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(b) Seebach, D.; Marti, R. E.; Hintermann, T. Helv. Chim. Acta 1996, 79, 1710-1740.
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34
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0035850273
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We thank Prof. Patrick Walsh for a sample of titanium tetra[(S)-1-(4-methylphenyl)propoxide]: Davis, T. J.; Balsells, J.; Carroll, P. J.; Walsh, P. J. Org. Lett. 2001, 3, 2161-2164.
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Walsh, P.J.4
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