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There have been reported the following reaction conditions, (a) (-78°C, 22 h) Ender, D.; Backhaus, D.; Runsink, J. Angew. Chem., Int. Ed. Engl. 1994, 33, 2098. (b) (-70°C, 10 h then → 70 → 0 °C) Takahashi, O.; Mikami, K.; Nakai, T. Chem. Lett. 1987, 69. (c) (-35 1°C, 2 d) Reetz, M. T.; Griebenow, N.; Goddard, R. J. Chem. Soc., Chem. Commun. 1995, 1605. (d) (-78°C, 40 min, then -40°C, 2.7 h) Brückner, R. Chem. Ber. 1989, 122, 703. (e) (-78°C, 2 h) Yokomatsu, T.; Yamagishi, T.; Shibuya, S. Synlett 1995, 1035. (f) See ref 21.
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There have been reported the following reaction conditions, (a) (-78°C, 22 h) Ender, D.; Backhaus, D.; Runsink, J. Angew. Chem., Int. Ed. Engl. 1994, 33, 2098. (b) (-70°C, 10 h then → 70 → 0 °C) Takahashi, O.; Mikami, K.; Nakai, T. Chem. Lett. 1987, 69. (c) (-35 1°C, 2 d) Reetz, M. T.; Griebenow, N.; Goddard, R. J. Chem. Soc., Chem. Commun. 1995, 1605. (d) (-78°C, 40 min, then -40°C, 2.7 h) Brückner, R. Chem. Ber. 1989, 122, 703. (e) (-78°C, 2 h) Yokomatsu, T.; Yamagishi, T.; Shibuya, S. Synlett 1995, 1035. (f) See ref 21.
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There have been reported the following reaction conditions, (a) (-78°C, 22 h) Ender, D.; Backhaus, D.; Runsink, J. Angew. Chem., Int. Ed. Engl. 1994, 33, 2098. (b) (-70°C, 10 h then → 70 → 0 °C) Takahashi, O.; Mikami, K.; Nakai, T. Chem. Lett. 1987, 69. (c) (-35 1°C, 2 d) Reetz, M. T.; Griebenow, N.; Goddard, R. J. Chem. Soc., Chem. Commun. 1995, 1605. (d) (-78°C, 40 min, then -40°C, 2.7 h) Brückner, R. Chem. Ber. 1989, 122, 703. (e) (-78°C, 2 h) Yokomatsu, T.; Yamagishi, T.; Shibuya, S. Synlett 1995, 1035. (f) See ref 21.
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There have been reported the following reaction conditions, (a) (-78°C, 22 h) Ender, D.; Backhaus, D.; Runsink, J. Angew. Chem., Int. Ed. Engl. 1994, 33, 2098. (b) (-70°C, 10 h then → 70 → 0 °C) Takahashi, O.; Mikami, K.; Nakai, T. Chem. Lett. 1987, 69. (c) (-35 1°C, 2 d) Reetz, M. T.; Griebenow, N.; Goddard, R. J. Chem. Soc., Chem. Commun. 1995, 1605. (d) (-78°C, 40 min, then -40°C, 2.7 h) Brückner, R. Chem. Ber. 1989, 122, 703. (e) (-78°C, 2 h) Yokomatsu, T.; Yamagishi, T.; Shibuya, S. Synlett 1995, 1035. (f) See ref 21.
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See ref 21
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There have been reported the following reaction conditions, (a) (-78°C, 22 h) Ender, D.; Backhaus, D.; Runsink, J. Angew. Chem., Int. Ed. Engl. 1994, 33, 2098. (b) (-70°C, 10 h then → 70 → 0 °C) Takahashi, O.; Mikami, K.; Nakai, T. Chem. Lett. 1987, 69. (c) (-35 1°C, 2 d) Reetz, M. T.; Griebenow, N.; Goddard, R. J. Chem. Soc., Chem. Commun. 1995, 1605. (d) (-78°C, 40 min, then -40°C, 2.7 h) Brückner, R. Chem. Ber. 1989, 122, 703. (e) (-78°C, 2 h) Yokomatsu, T.; Yamagishi, T.; Shibuya, S. Synlett 1995, 1035. (f) See ref 21.
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85
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3 substituent. (a) Gassman, P. G.; Harrington, C. K. J. Org. Chem. 1990, 55, 1813. (b) Creary, X.; Sky, A. E.; Mehrsheikh-Mohammadi, M. E. Tetrahedron Lett. 1988, 29, 6839. (c) Yamazaki, T.; Hiraoka, S.; Kitazume, T. J. Org. Chem. 1994, 59, 5100.
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3 substituent. (a) Gassman, P. G.; Harrington, C. K. J. Org. Chem. 1990, 55, 1813. (b) Creary, X.; Sky, A. E.; Mehrsheikh-Mohammadi, M. E. Tetrahedron Lett. 1988, 29, 6839. (c) Yamazaki, T.; Hiraoka, S.; Kitazume, T. J. Org. Chem. 1994, 59, 5100.
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3 substituent. (a) Gassman, P. G.; Harrington, C. K. J. Org. Chem. 1990, 55, 1813. (b) Creary, X.; Sky, A. E.; Mehrsheikh-Mohammadi, M. E. Tetrahedron Lett. 1988, 29, 6839. (c) Yamazaki, T.; Hiraoka, S.; Kitazume, T. J. Org. Chem. 1994, 59, 5100.
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(c) Priepke, H.; Brückner, R. Angew. Chem., Int. Ed. Engl. 1988, 27, 278.
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0001692460
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In the enolate [2,3]-Wittig rearrangement without transition metal species, high syn selection using E-substrate (low anti selection using Z-substrate) has been reported. For example, see the following reference. Uchikawa, M.; Katsuki, T.; Yamaguchi, M. Tetrahedron Lett. 1986, 27, 4581. There have been several examples that esterenolate [2,3]-Wittig shift of Z substrate showed high anti stereoselection. See ref 28.
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Koreeda et al. have been reported that the following substrate gave anti isomer in a highly stereoselective fashion. The unusual selectivity has been explained by the envelope-like transition state C suggested by Rautenstrauch (Koreeda, M.; Ricca, D. J. Org. Chem. 1986, 51, 4090.) equiation presented.
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note
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3-containing (E)-or (Z)-substrate. It was supposed that HMPA employed as a cosolvent might be a scavenger for lithium cation. Therefore, the transition state without this cation was calculated which is different from Houk's one. As a result, (Z)-substrate affords anti product in a highly stereoselective manner, while (E)-substrate also provides anti isomer stereoselectively. Furthermore, surprisingly, the second stable TS derived from (E)-isomer is the one which might produce anti isomer possessing Z configuration at the newly created olefinic bond.
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100
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0001538420
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(a) Burke, S. D.; Fobare, W. F.; Pacofsky, G. J. J. Org. Chem. 1983, 48, 5221.
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