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For the asymmetric Michael addition of nitromethane, see: (a) Colonna, S.; Hiemstra, H.; Wynberg, H. Chem. Commun. 1978, 238. For the Mukaiyama-type reactions, see: (b) Ando, A.; Miura, T.; Tatematsu, T.; Shioiri, T. Tetrahedron Lett. 1993, 34, 1507. (c) Shioiri, T.; Bohsako, A.; Ando, A. Heterocycles 1996, 42, 93. (d) Horikawa, M.; Busch-Petersen, J.; Corey, E. J. Tetrahedron Lett. 1999, 40, 3843. (e) Bluet, G.; Campagne, J.-M. J. Org. Chem. 2001, 66, 4293. For the trifluoromethylation of aldehydes, see: (f) Iseki, K.; Nagai, T.; Kobayashi, Y. Tetrahedron Lett. 1994, 35. 3137. (g) Kuroki, Y.; Iseki, K. Tetrahedron Lett. 1999, 40, 8231.
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For the asymmetric Michael addition of nitromethane, see: (a) Colonna, S.; Hiemstra, H.; Wynberg, H. Chem. Commun. 1978, 238. For the Mukaiyama-type reactions, see: (b) Ando, A.; Miura, T.; Tatematsu, T.; Shioiri, T. Tetrahedron Lett. 1993, 34, 1507. (c) Shioiri, T.; Bohsako, A.; Ando, A. Heterocycles 1996, 42, 93. (d) Horikawa, M.; Busch-Petersen, J.; Corey, E. J. Tetrahedron Lett. 1999, 40, 3843. (e) Bluet, G.; Campagne, J.-M. J. Org. Chem. 2001, 66, 4293. For the trifluoromethylation of aldehydes, see: (f) Iseki, K.; Nagai, T.; Kobayashi, Y. Tetrahedron Lett. 1994, 35. 3137. (g) Kuroki, Y.; Iseki, K. Tetrahedron Lett. 1999, 40, 8231.
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For the asymmetric Michael addition of nitromethane, see: (a) Colonna, S.; Hiemstra, H.; Wynberg, H. Chem. Commun. 1978, 238. For the Mukaiyama-type reactions, see: (b) Ando, A.; Miura, T.; Tatematsu, T.; Shioiri, T. Tetrahedron Lett. 1993, 34, 1507. (c) Shioiri, T.; Bohsako, A.; Ando, A. Heterocycles 1996, 42, 93. (d) Horikawa, M.; Busch-Petersen, J.; Corey, E. J. Tetrahedron Lett. 1999, 40, 3843. (e) Bluet, G.; Campagne, J.-M. J. Org. Chem. 2001, 66, 4293. For the trifluoromethylation of aldehydes, see: (f) Iseki, K.; Nagai, T.; Kobayashi, Y. Tetrahedron Lett. 1994, 35. 3137. (g) Kuroki, Y.; Iseki, K. Tetrahedron Lett. 1999, 40, 8231.
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For the asymmetric Michael addition of nitromethane, see: (a) Colonna, S.; Hiemstra, H.; Wynberg, H. Chem. Commun. 1978, 238. For the Mukaiyama-type reactions, see: (b) Ando, A.; Miura, T.; Tatematsu, T.; Shioiri, T. Tetrahedron Lett. 1993, 34, 1507. (c) Shioiri, T.; Bohsako, A.; Ando, A. Heterocycles 1996, 42, 93. (d) Horikawa, M.; Busch-Petersen, J.; Corey, E. J. Tetrahedron Lett. 1999, 40, 3843. (e) Bluet, G.; Campagne, J.-M. J. Org. Chem. 2001, 66, 4293. For the trifluoromethylation of aldehydes, see: (f) Iseki, K.; Nagai, T.; Kobayashi, Y. Tetrahedron Lett. 1994, 35. 3137. (g) Kuroki, Y.; Iseki, K. Tetrahedron Lett. 1999, 40, 8231.
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For the asymmetric Michael addition of nitromethane, see: (a) Colonna, S.; Hiemstra, H.; Wynberg, H. Chem. Commun. 1978, 238. For the Mukaiyama-type reactions, see: (b) Ando, A.; Miura, T.; Tatematsu, T.; Shioiri, T. Tetrahedron Lett. 1993, 34, 1507. (c) Shioiri, T.; Bohsako, A.; Ando, A. Heterocycles 1996, 42, 93. (d) Horikawa, M.; Busch-Petersen, J.; Corey, E. J. Tetrahedron Lett. 1999, 40, 3843. (e) Bluet, G.; Campagne, J.-M. J. Org. Chem. 2001, 66, 4293. For the trifluoromethylation of aldehydes, see: (f) Iseki, K.; Nagai, T.; Kobayashi, Y. Tetrahedron Lett. 1994, 35. 3137. (g) Kuroki, Y.; Iseki, K. Tetrahedron Lett. 1999, 40, 8231.
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For our recent studies using this type of ammonium bromides as chiral phase-transfer catalysts, see: (a) Ooi, T.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 1999, 121, 6519. (b) Ooi, T.; Takeuchi, M.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 2000, 122, 5228. (c) Ooi, T.; Kameda, M.; Tannai, H.; Maruoka, K. Tetrahedron Lett. 2000, 41, 8339. (d) Ooi, T.; Takeuchi, M.; Maruoka, K. Synthesis 2001, 1716. (e) Ooi, T.; Uematsu, Y.; Kameda, M.; Maruoka, K. Angew. Chem., Int. Ed. 2002, 41, 1551. (f) Ooi, T.; Takahashi, M.; Doda, K.; Maruoka, K. J. Am. Chem. Soc. 2002, 124, 7640.
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For our recent studies using this type of ammonium bromides as chiral phase-transfer catalysts, see: (a) Ooi, T.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 1999, 121, 6519. (b) Ooi, T.; Takeuchi, M.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 2000, 122, 5228. (c) Ooi, T.; Kameda, M.; Tannai, H.; Maruoka, K. Tetrahedron Lett. 2000, 41, 8339. (d) Ooi, T.; Takeuchi, M.; Maruoka, K. Synthesis 2001, 1716. (e) Ooi, T.; Uematsu, Y.; Kameda, M.; Maruoka, K. Angew. Chem., Int. Ed. 2002, 41, 1551. (f) Ooi, T.; Takahashi, M.; Doda, K.; Maruoka, K. J. Am. Chem. Soc. 2002, 124, 7640.
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For our recent studies using this type of ammonium bromides as chiral phase-transfer catalysts, see: (a) Ooi, T.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 1999, 121, 6519. (b) Ooi, T.; Takeuchi, M.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 2000, 122, 5228. (c) Ooi, T.; Kameda, M.; Tannai, H.; Maruoka, K. Tetrahedron Lett. 2000, 41, 8339. (d) Ooi, T.; Takeuchi, M.; Maruoka, K. Synthesis 2001, 1716. (e) Ooi, T.; Uematsu, Y.; Kameda, M.; Maruoka, K. Angew. Chem., Int. Ed. 2002, 41, 1551. (f) Ooi, T.; Takahashi, M.; Doda, K.; Maruoka, K. J. Am. Chem. Soc. 2002, 124, 7640.
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For our recent studies using this type of ammonium bromides as chiral phase-transfer catalysts, see: (a) Ooi, T.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 1999, 121, 6519. (b) Ooi, T.; Takeuchi, M.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 2000, 122, 5228. (c) Ooi, T.; Kameda, M.; Tannai, H.; Maruoka, K. Tetrahedron Lett. 2000, 41, 8339. (d) Ooi, T.; Takeuchi, M.; Maruoka, K. Synthesis 2001, 1716. (e) Ooi, T.; Uematsu, Y.; Kameda, M.; Maruoka, K. Angew. Chem., Int. Ed. 2002, 41, 1551. (f) Ooi, T.; Takahashi, M.; Doda, K.; Maruoka, K. J. Am. Chem. Soc. 2002, 124, 7640.
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For our recent studies using this type of ammonium bromides as chiral phase-transfer catalysts, see: (a) Ooi, T.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 1999, 121, 6519. (b) Ooi, T.; Takeuchi, M.; Kameda, M.; Maruoka, K. J. Am. Chem. Soc. 2000, 122, 5228. (c) Ooi, T.; Kameda, M.; Tannai, H.; Maruoka, K. Tetrahedron Lett. 2000, 41, 8339. (d) Ooi, T.; Takeuchi, M.; Maruoka, K. Synthesis 2001, 1716. (e) Ooi, T.; Uematsu, Y.; Kameda, M.; Maruoka, K. Angew. Chem., Int. Ed. 2002, 41, 1551. (f) Ooi, T.; Takahashi, M.; Doda, K.; Maruoka, K. J. Am. Chem. Soc. 2002, 124, 7640.
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0013454271
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note
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- at δ -149.8 ppm. With the addition of 2a (2.4 equiv) at -78 °C, the sharp signal of trimethylsilyl fluoride appeared at δ -157.61 ppm, supporting generation of the corresponding chiral ammonium nitronate.
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35
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0013447084
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note
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Attempted reaction of silyl nitronate 2a with heteroaromatic aldehyde, 2-furaldehyde, under similar conditions gave the corresponding nitroaldol 3 with moderate enantioselectivity [97% (anti/syn = 85:15), 77% ee (anti isomer)]. We also investigated aliphatic aldehydes in the nitroaldol reaction with 2a (at -78 °C for 0.5 h and -20 °C for 3 h), and the following results imply the present limitation of this method: 3-phenylpropanal [98% (anti/syn = 21:79), 46% ee (anti isomer), and 33% ee (syn isomer)]; cyclohexanecarboxaldehyde [87% (anti/syn = 43:57), 33% ee (anti isomer), and 20% ee (syn isomer)].
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