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For recent monographs and reviews see: (a) Noyori, R. Asymmetric Catalysis in Organic Synthesis; John Wiley: New York, 1994. (b) Ojima, I. Asymmetric Synthesis; Verlag: New York, 1993. (c) Collins, A. N.; Sheldrake, G. N.; Crosby, J. Chirality in Industry; John Wiley: New York, 1992. (d) Bosnich, B. Asymmetric Catalysis; Martinus Nijhoff Publishers: Dordrecht, 1986. (e) Brunner, H. Synthesis 1988, 645. ff) Brown, J. M.; Davies, S. G. Nature 1989, 342, 631. (h) Pfaltz, A. Chimia 1990, 44, 202. (i) Nugent, W. A.; RajanBabu, T. V.; Burk, M. J. Science 1993, 259, 479.
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For recent monographs and reviews see: (a) Noyori, R. Asymmetric Catalysis in Organic Synthesis; John Wiley: New York, 1994. (b) Ojima, I. Asymmetric Synthesis; Verlag: New York, 1993. (c) Collins, A. N.; Sheldrake, G. N.; Crosby, J. Chirality in Industry; John Wiley: New York, 1992. (d) Bosnich, B. Asymmetric Catalysis; Martinus Nijhoff Publishers: Dordrecht, 1986. (e) Brunner, H. Synthesis 1988, 645. ff) Brown, J. M.; Davies, S. G. Nature 1989, 342, 631. (h) Pfaltz, A. Chimia 1990, 44, 202. (i) Nugent, W. A.; RajanBabu, T. V.; Burk, M. J. Science 1993, 259, 479.
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See for example: (a) Jacobsen, E. N.; Zhang, W.; Güler, M. L. J. Am. Chem. Soc. 1991, 113, 6703. (b) Nishiyama, H.; Yamaguchi, S.; Kondo, M.; Itoh, K. J. Org. Chem. 1992, 57, 4306. (c) Schnyder, A.; Hintermann, L.; Togni, A. Angew. Chem., Int. Ed. Engl. 1995, 34, 931. (d) Frost, C. G.; Howarth, J.; Williams, J. M. J. Tetrahedron: Asymmetry 1992, 3, 1089. (e) Togni, A.; Breutel, C.; Schnyder, A.; Spidler, F.; Landert, H.; Tijani, A. J. Am. Chem. Soc. 1994, 116, 4062. (f) Sakai, N.; Mano, S.; Nozaki, K.; Takaya, H. J. Am. Chem. Soc. 1993, 115, 7033. (g) von Matt, P.; Lloyd-Jones, G. C.; Minidis, A. B. E.; Pfaltz, A.; Macko, L.; Neuburger, M.; Zehnder, M.; Rüegger, H.; Pregosin, P. S. Helv. Chim. Acta 1995, 78, 265. (h) Rieck, H.; Helmchen, G. Angew. Chem., Int. Ed. Engl. 1995, 34, 2687.
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Yamaguchi, S.2
Kondo, M.3
Itoh, K.4
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See for example: (a) Jacobsen, E. N.; Zhang, W.; Güler, M. L. J. Am. Chem. Soc. 1991, 113, 6703. (b) Nishiyama, H.; Yamaguchi, S.; Kondo, M.; Itoh, K. J. Org. Chem. 1992, 57, 4306. (c) Schnyder, A.; Hintermann, L.; Togni, A. Angew. Chem., Int. Ed. Engl. 1995, 34, 931. (d) Frost, C. G.; Howarth, J.; Williams, J. M. J. Tetrahedron: Asymmetry 1992, 3, 1089. (e) Togni, A.; Breutel, C.; Schnyder, A.; Spidler, F.; Landert, H.; Tijani, A. J. Am. Chem. Soc. 1994, 116, 4062. (f) Sakai, N.; Mano, S.; Nozaki, K.; Takaya, H. J. Am. Chem. Soc. 1993, 115, 7033. (g) von Matt, P.; Lloyd-Jones, G. C.; Minidis, A. B. E.; Pfaltz, A.; Macko, L.; Neuburger, M.; Zehnder, M.; Rüegger, H.; Pregosin, P. S. Helv. Chim. Acta 1995, 78, 265. (h) Rieck, H.; Helmchen, G. Angew. Chem., Int. Ed. Engl. 1995, 34, 2687.
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Hintermann, L.2
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See for example: (a) Jacobsen, E. N.; Zhang, W.; Güler, M. L. J. Am. Chem. Soc. 1991, 113, 6703. (b) Nishiyama, H.; Yamaguchi, S.; Kondo, M.; Itoh, K. J. Org. Chem. 1992, 57, 4306. (c) Schnyder, A.; Hintermann, L.; Togni, A. Angew. Chem., Int. Ed. Engl. 1995, 34, 931. (d) Frost, C. G.; Howarth, J.; Williams, J. M. J. Tetrahedron: Asymmetry 1992, 3, 1089. (e) Togni, A.; Breutel, C.; Schnyder, A.; Spidler, F.; Landert, H.; Tijani, A. J. Am. Chem. Soc. 1994, 116, 4062. (f) Sakai, N.; Mano, S.; Nozaki, K.; Takaya, H. J. Am. Chem. Soc. 1993, 115, 7033. (g) von Matt, P.; Lloyd-Jones, G. C.; Minidis, A. B. E.; Pfaltz, A.; Macko, L.; Neuburger, M.; Zehnder, M.; Rüegger, H.; Pregosin, P. S. Helv. Chim. Acta 1995, 78, 265. (h) Rieck, H.; Helmchen, G. Angew. Chem., Int. Ed. Engl. 1995, 34, 2687.
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Frost, C.G.1
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See for example: (a) Jacobsen, E. N.; Zhang, W.; Güler, M. L. J. Am. Chem. Soc. 1991, 113, 6703. (b) Nishiyama, H.; Yamaguchi, S.; Kondo, M.; Itoh, K. J. Org. Chem. 1992, 57, 4306. (c) Schnyder, A.; Hintermann, L.; Togni, A. Angew. Chem., Int. Ed. Engl. 1995, 34, 931. (d) Frost, C. G.; Howarth, J.; Williams, J. M. J. Tetrahedron: Asymmetry 1992, 3, 1089. (e) Togni, A.; Breutel, C.; Schnyder, A.; Spidler, F.; Landert, H.; Tijani, A. J. Am. Chem. Soc. 1994, 116, 4062. (f) Sakai, N.; Mano, S.; Nozaki, K.; Takaya, H. J. Am. Chem. Soc. 1993, 115, 7033. (g) von Matt, P.; Lloyd-Jones, G. C.; Minidis, A. B. E.; Pfaltz, A.; Macko, L.; Neuburger, M.; Zehnder, M.; Rüegger, H.; Pregosin, P. S. Helv. Chim. Acta 1995, 78, 265. (h) Rieck, H.; Helmchen, G. Angew. Chem., Int. Ed. Engl. 1995, 34, 2687.
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Spidler, F.4
Landert, H.5
Tijani, A.6
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85013461641
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See for example: (a) Jacobsen, E. N.; Zhang, W.; Güler, M. L. J. Am. Chem. Soc. 1991, 113, 6703. (b) Nishiyama, H.; Yamaguchi, S.; Kondo, M.; Itoh, K. J. Org. Chem. 1992, 57, 4306. (c) Schnyder, A.; Hintermann, L.; Togni, A. Angew. Chem., Int. Ed. Engl. 1995, 34, 931. (d) Frost, C. G.; Howarth, J.; Williams, J. M. J. Tetrahedron: Asymmetry 1992, 3, 1089. (e) Togni, A.; Breutel, C.; Schnyder, A.; Spidler, F.; Landert, H.; Tijani, A. J. Am. Chem. Soc. 1994, 116, 4062. (f) Sakai, N.; Mano, S.; Nozaki, K.; Takaya, H. J. Am. Chem. Soc. 1993, 115, 7033. (g) von Matt, P.; Lloyd-Jones, G. C.; Minidis, A. B. E.; Pfaltz, A.; Macko, L.; Neuburger, M.; Zehnder, M.; Rüegger, H.; Pregosin, P. S. Helv. Chim. Acta 1995, 78, 265. (h) Rieck, H.; Helmchen, G. Angew. Chem., Int. Ed. Engl. 1995, 34, 2687.
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See for example: (a) Jacobsen, E. N.; Zhang, W.; Güler, M. L. J. Am. Chem. Soc. 1991, 113, 6703. (b) Nishiyama, H.; Yamaguchi, S.; Kondo, M.; Itoh, K. J. Org. Chem. 1992, 57, 4306. (c) Schnyder, A.; Hintermann, L.; Togni, A. Angew. Chem., Int. Ed. Engl. 1995, 34, 931. (d) Frost, C. G.; Howarth, J.; Williams, J. M. J. Tetrahedron: Asymmetry 1992, 3, 1089. (e) Togni, A.; Breutel, C.; Schnyder, A.; Spidler, F.; Landert, H.; Tijani, A. J. Am. Chem. Soc. 1994, 116, 4062. (f) Sakai, N.; Mano, S.; Nozaki, K.; Takaya, H. J. Am. Chem. Soc. 1993, 115, 7033. (g) von Matt, P.; Lloyd-Jones, G. C.; Minidis, A. B. E.; Pfaltz, A.; Macko, L.; Neuburger, M.; Zehnder, M.; Rüegger, H.; Pregosin, P. S. Helv. Chim. Acta 1995, 78, 265. (h) Rieck, H.; Helmchen, G. Angew. Chem., Int. Ed. Engl. 1995, 34, 2687.
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Neuburger, M.6
Zehnder, M.7
Rüegger, H.8
Pregosin, P.S.9
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See reference 1b for the abbreviations and the structures of the ligands
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Anecdotal evidence of electronic effects in Rh-catalyzed hydrogenation dates back to some of the original studies done by Kagan. See for example: (a) Dang, T. P.; Poulin, J. C.; Kagan, H. B. J. Organomet. Chem. 1975, 91, 105. (b) Hengartner, U.; Valentine, D., Jr.; Johnson, K. K.; Larscheid, M. E.; Pigott, F.; Scheidl, F.; Scott, J. W.; Sun, R. C.; Townsend, J. M.; Williams, T. H. J. Org. Chem. 1979, 44, 3741. (c) Yamagishi, T.; Yatagai, M.; Hatakeyama, H.; Hida, M. Bull. Chem. Soc. Jpn. 1984, 57, 1897. (d) Inoguchi, K.; Morimoto, T.; Achiwa, K. J. Organomet. Chem. 1989, 370, C9. (e) Werz, U.; Brune, H. A. J. Organomet. Chem. 1989, 365, 367. (f) Morimoto, T.; Chiba, M.; Achiwa, K. Chem. Pharm. Bull. 1992, 40, 2894.
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Anecdotal evidence of electronic effects in Rh-catalyzed hydrogenation dates back to some of the original studies done by Kagan. See for example: (a) Dang, T. P.; Poulin, J. C.; Kagan, H. B. J. Organomet. Chem. 1975, 91, 105. (b) Hengartner, U.; Valentine, D., Jr.; Johnson, K. K.; Larscheid, M. E.; Pigott, F.; Scheidl, F.; Scott, J. W.; Sun, R. C.; Townsend, J. M.; Williams, T. H. J. Org. Chem. 1979, 44, 3741. (c) Yamagishi, T.; Yatagai, M.; Hatakeyama, H.; Hida, M. Bull. Chem. Soc. Jpn. 1984, 57, 1897. (d) Inoguchi, K.; Morimoto, T.; Achiwa, K. J. Organomet. Chem. 1989, 370, C9. (e) Werz, U.; Brune, H. A. J. Organomet. Chem. 1989, 365, 367. (f) Morimoto, T.; Chiba, M.; Achiwa, K. Chem. Pharm. Bull. 1992, 40, 2894.
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Anecdotal evidence of electronic effects in Rh-catalyzed hydrogenation dates back to some of the original studies done by Kagan. See for example: (a) Dang, T. P.; Poulin, J. C.; Kagan, H. B. J. Organomet. Chem. 1975, 91, 105. (b) Hengartner, U.; Valentine, D., Jr.; Johnson, K. K.; Larscheid, M. E.; Pigott, F.; Scheidl, F.; Scott, J. W.; Sun, R. C.; Townsend, J. M.; Williams, T. H. J. Org. Chem. 1979, 44, 3741. (c) Yamagishi, T.; Yatagai, M.; Hatakeyama, H.; Hida, M. Bull. Chem. Soc. Jpn. 1984, 57, 1897. (d) Inoguchi, K.; Morimoto, T.; Achiwa, K. J. Organomet. Chem. 1989, 370, C9. (e) Werz, U.; Brune, H. A. J. Organomet. Chem. 1989, 365, 367. (f) Morimoto, T.; Chiba, M.; Achiwa, K. Chem. Pharm. Bull. 1992, 40, 2894.
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A preliminary account of this work has been published; see reference 16
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A preliminary account of this work has been published; see reference 16.
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1542430044
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Use of DUPHOS ligands is another solution to this problem; see reference 29
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Use of DUPHOS ligands is another solution to this problem; see reference 29.
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74
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For the preparation of bis[3,5-bis(trimethylsilyl)phenyl]diethylaminophosphine, see: Trost, B. M.; Murphy, D. J. Organometallics 1985, 4, 1143.
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16 appeared, R. Selke informed us of the use of conformationally restricted phosphinites i and ii for the syntheis of D amino acids (presented at the International Conference on Circular Dichroism, Bochum, Germany, 1991, Abstracts p 305). We thank Dr. Selke for this private communication. See also reference 24d. Chemical equations presented
-
-
-
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79
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1542639744
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-
note
-
It has since been found that for large scale synthesis of 18 low temperature benzoylation of α-methyl D-glucopyranose using 3-picoline as a base can be employed, thereby avoiding the use of the toxic tin derivatives (unpublished results with R. Shapiro).
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80
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Oliver, J. D.; Riley, D. P. Organometallics 1983, 2, 1032. For a study of rates of hydrogenation using five-, six-, and seven-membered rhodium chelates see also: Landis, C. R.; Halpern, J. J. Organomet. Chem. 1983, 250, 485. Descotes, G.; Lafont, D.; Sinou, D.; Brown, J. M.; Chaloner, P. A.; Parker, D. Nouv. J. Chim. 1981, 5, 167.
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- with L as COD and NBD. While the former has a well-defined λ-twist-chair conformation (34), in the crystals of the latter, two kinds of conformations can be identified, a λ-twist-chair and a λ-twist-boat (unpublished results with T. A. Ayers and J. Calabrese). Both these conformations exhibit a clockwise skewed rotation of the diene ligands as expected of the catalysts that give the (S)-enantiomers.
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We have seen similar behavior in catalytic enantioselective alkylation of π-allylpalladium compounds by stabilized carbanions. Rigid backbones even with seven-membered chelates tend to diminish the electronic effects. Conformationally flexible ligands show more pronounced and generally predictable trends in electronic effects. At present, more examples are needed before this hypothesis can be fully verified (see reference 34).
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A more detailed NMR and modeling study of this simplified system is forthcoming (unpublished results with C. Hadad, B. Radetich, and K. You).
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