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For selected reviews on catalytic enantioselective aldol reactions, see: (a) Machajewski, T. D.; Wong, C.-H., Lerner, R. A. Angew. Chem., Int. Ed. 2000, 39, 1352. (b) Denmark, S. E.; Stavenger, R. A. Acc. Chem. Res. 2000, 33, 432. (c) Nelson, S. G. Tetrahedron: Asymmetry 1998, 9, 357. (d) Carreira, E. M. In Comprehensive Asymmetric Catalysis; Jacobsen, E. N., Pfaltz, A., Yamamoto, H., Eds.; Springer: Berlin, 1999; Vol. III, p 1. (e) Braun, M. In Stereoselective Synthesis, Methods of Organic Chemistry (Houben-Weyl), ed. E21; Helmchen, G., Hoffman, R., Mulzer, J., Schaumann, E., Eds.; Thieme: Stuttgart, 1996; Vol. 3, p 1730.
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For selected reviews on catalytic enantioselective aldol reactions, see: (a) Machajewski, T. D.; Wong, C.-H., Lerner, R. A. Angew. Chem., Int. Ed. 2000, 39, 1352. (b) Denmark, S. E.; Stavenger, R. A. Acc. Chem. Res. 2000, 33, 432. (c) Nelson, S. G. Tetrahedron: Asymmetry 1998, 9, 357. (d) Carreira, E. M. In Comprehensive Asymmetric Catalysis; Jacobsen, E. N., Pfaltz, A., Yamamoto, H., Eds.; Springer: Berlin, 1999; Vol. III, p 1. (e) Braun, M. In Stereoselective Synthesis, Methods of Organic Chemistry (Houben-Weyl), ed. E21; Helmchen, G., Hoffman, R., Mulzer, J., Schaumann, E., Eds.; Thieme: Stuttgart, 1996; Vol. 3, p 1730.
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Aldol cyclizations have been catalyzed by antibodies and chiral amines: (a) List, B.; Lerner, R. A.; Barbas, C. F., III. Org. Lett. 1999, 1, 59. (b) Eder, U.; Sauer, G.; Wiechert, R. Angew. Chem., Int. Ed. Engl. 1971, 10, 496. (c) Hajos, Z. G.; Parrish, D. R. J. Org. Chem. 1974, 39, 1615. (d) Agami, C.; Platzer, N.; Sevestre, H. Bull. Soc. Chim. Fr. 1987, 2, 358. (e) Eder, U.; Weichert, R.; Sauer, G. German Patent DE 2014757, Oct. 7, 1971.
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Aldol cyclizations have been catalyzed by antibodies and chiral amines: (a) List, B.; Lerner, R. A.; Barbas, C. F., III. Org. Lett. 1999, 1, 59. (b) Eder, U.; Sauer, G.; Wiechert, R. Angew. Chem., Int. Ed. Engl. 1971, 10, 496. (c) Hajos, Z. G.; Parrish, D. R. J. Org. Chem. 1974, 39, 1615. (d) Agami, C.; Platzer, N.; Sevestre, H. Bull. Soc. Chim. Fr. 1987, 2, 358. (e) Eder, U.; Weichert, R.; Sauer, G. German Patent DE 2014757, Oct. 7, 1971.
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For catalytic reductive aldol processes, see: (a) Revis, A.; Hilty, T. K. Tetrahedron Lett. 1987, 28, 4809. (b) Matsuda, I.; Takahashi, K.; Sato, S. Tetrahedron Lett. 1990, 31, 5331. (c) Isayama, S.; Mukaiyama, T. Chem. Lett. 1989, 2005. (d) Kiyooka, S.; Shimizu, A.; Torii, S. Tetrahedron Lett. 1998, 39, 5237. (e) Ooi, T.; Doda, K.; Sakai, D.; Maruoka, K. Tetrahedron Lett. 1999, 40, 2133. (f) Taylor, S. J.; Morken, J. P. J. Am. Chem. Soc. 1999, 121, 12202. (g) Taylor, S. J.; Duffey, M. O.; Morken, J. P. J. Am. Chem. Soc. 2000, 122, 4528. (h) Zhao, C.-X.; Duffey, M. O.; Taylor, S. J.; Morken, J. P. Org. Lett. 2001, 3, 1829.
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For catalytic reductive aldol processes, see: (a) Revis, A.; Hilty, T. K. Tetrahedron Lett. 1987, 28, 4809. (b) Matsuda, I.; Takahashi, K.; Sato, S. Tetrahedron Lett. 1990, 31, 5331. (c) Isayama, S.; Mukaiyama, T. Chem. Lett. 1989, 2005. (d) Kiyooka, S.; Shimizu, A.; Torii, S. Tetrahedron Lett. 1998, 39, 5237. (e) Ooi, T.; Doda, K.; Sakai, D.; Maruoka, K. Tetrahedron Lett. 1999, 40, 2133. (f) Taylor, S. J.; Morken, J. P. J. Am. Chem. Soc. 1999, 121, 12202. (g) Taylor, S. J.; Duffey, M. O.; Morken, J. P. J. Am. Chem. Soc. 2000, 122, 4528. (h) Zhao, C.-X.; Duffey, M. O.; Taylor, S. J.; Morken, J. P. Org. Lett. 2001, 3, 1829.
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For catalytic reductive aldol processes, see: (a) Revis, A.; Hilty, T. K. Tetrahedron Lett. 1987, 28, 4809. (b) Matsuda, I.; Takahashi, K.; Sato, S. Tetrahedron Lett. 1990, 31, 5331. (c) Isayama, S.; Mukaiyama, T. Chem. Lett. 1989, 2005. (d) Kiyooka, S.; Shimizu, A.; Torii, S. Tetrahedron Lett. 1998, 39, 5237. (e) Ooi, T.; Doda, K.; Sakai, D.; Maruoka, K. Tetrahedron Lett. 1999, 40, 2133. (f) Taylor, S. J.; Morken, J. P. J. Am. Chem. Soc. 1999, 121, 12202. (g) Taylor, S. J.; Duffey, M. O.; Morken, J. P. J. Am. Chem. Soc. 2000, 122, 4528. (h) Zhao, C.-X.; Duffey, M. O.; Taylor, S. J.; Morken, J. P. Org. Lett. 2001, 3, 1829.
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Tagliavini, E.4
Trombini, C.5
Umani-Ronchi, A.6
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33
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12244306627
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note
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2, and triphenylphosphine (30.4 mmol, 100 mol %) was added; the reaction mixture was allowed to stir for 2 h at 25°C. At this point, the appropriate Wittig reagent (30.4 mmol, 100 mol %) was added in portions over 10 min and the solution stirred for 18 h. The residue was evaporated onto silica and subjected to column chromatography to afford monoenone monoketones 1a-5a.
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34
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12244301327
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note
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2 (200 mL, 0.091 M), and the acetophenone-derived Wittig reagent (18.2 mmol, 100 mol %) was added in portions over 10 min; the solution was allowed to stir for 18 h. The residue was evaporated onto silica and subjected to column chromatography to afford the monoenone monoketone 6a (4.75 g, 86% yield) as a clear colorless oil.
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36
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12244266219
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See Supporting Information for crystallographic data
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See Supporting Information for crystallographic data.
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37
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0002714675
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Still, W. C.; Kahn, M.; Mitra, A, J, Org. Chem, 1978, 43, 2923.
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(1978)
J. Org. Chem.
, vol.43
, pp. 2923
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Still, W.C.1
Kahn, M.2
Mitra, A.3
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