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Recently, Simpkins et al. also reported the synthesis of optically active N-(o-tert-butylphenyl)propanamide (93% ee) in accordance with our optical resolution method (ref 2). (a) Hughes, A. D.; Simpkins, N. S. Synlett 1998, 967. (b) Hughes, A. D.; Price, D. A.; Simpkins, N. S. J. Chem. Soc., Perkin Trans. 1 1999, 1295. On the other hand, the synthesis of optically pure forms of atropisomeric amides and imides through the optical resolution using chiral chromatography has been reported by two groups, while the absolute configuration of these atropisomeric compounds has not yet been determined. (c) Curran, D. P.; Hale, G. R.; Geib, S. J.; Balog, A.; Cass, Q. B.; Degani, A. L. G.; Hernandes, M. Z.; Freitas, L. C. G. Tetrahedron: Asymmetry 1997, 8, 3955. (d) Kondo, K.; Fujita, H.; Suzuki, T.; Murakami, Y. Tetrahedron Lett. 1999, 40, 5577.
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Recently, Simpkins et al. also reported the synthesis of optically active N-(o-tert-butylphenyl)propanamide (93% ee) in accordance with our optical resolution method (ref 2). (a) Hughes, A. D.; Simpkins, N. S. Synlett 1998, 967. (b) Hughes, A. D.; Price, D. A.; Simpkins, N. S. J. Chem. Soc., Perkin Trans. 1 1999, 1295. On the other hand, the synthesis of optically pure forms of atropisomeric amides and imides through the optical resolution using chiral chromatography has been reported by two groups, while the absolute configuration of these atropisomeric compounds has not yet been determined. (c) Curran, D. P.; Hale, G. R.; Geib, S. J.; Balog, A.; Cass, Q. B.; Degani, A. L. G.; Hernandes, M. Z.; Freitas, L. C. G. Tetrahedron: Asymmetry 1997, 8, 3955. (d) Kondo, K.; Fujita, H.; Suzuki, T.; Murakami, Y. Tetrahedron Lett. 1999, 40, 5577.
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0030959276
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Papers in relation to the origin of 3,5-trans-selectivity: (a) Seebach, D.; Maetzke, T.; Petter, W.; Klotzer, B.; Plattner, D. A. J. Am. Chem. Soc. 1991, 113, 1781. (b) Meyers, A. I.; Seefeld, M. A.; Bruce, A. L.; Blake, J. F. J. Am. Chem. Soc. 1997, 119, 4565. (c) Ando, K.; Green, N. S.; Li, Y.; Houk, K. N. J. Am. Chem. Soc. 1999, 121, 5334.
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0033538331
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Papers in relation to the origin of 3,5-trans-selectivity: (a) Seebach, D.; Maetzke, T.; Petter, W.; Klotzer, B.; Plattner, D. A. J. Am. Chem. Soc. 1991, 113, 1781. (b) Meyers, A. I.; Seefeld, M. A.; Bruce, A. L.; Blake, J. F. J. Am. Chem. Soc. 1997, 119, 4565. (c) Ando, K.; Green, N. S.; Li, Y.; Houk, K. N. J. Am. Chem. Soc. 1999, 121, 5334.
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28
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0343737475
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note
-
Moderate 3.5-cis-selectivity (cis/trans = 5) has been observed in the reaction of bicyclic lactam enolate with a small electrophile such as MeI, while under the same conditions, the reaction with other electrophiles such as allyl bromide and benzyl bromide proceeded in a nonselective manner or with low 3,5-trans-selectivity. See refs 5f, 5j, and 5k.
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29
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0033525694
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Preliminary communication of this work: Fujita, M.; Kitagawa, O.; Izawa, H.; Dobashi, A.; Fukaya, H.; Taguchi, T. Tetrahedron Lett. 1999, 40, 1949.
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Fujita, M.1
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Fukaya, H.5
Taguchi, T.6
-
30
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84987564680
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It has been reported that nitrogen of amide Li-enolates is completely tetrahedralized. (a) Laube, T.; Dunitz, J. D. Seebach, D. Helv. Chim. Acta 1985, 68, 1373. (b) Bauer, W.; Laube, T.; Seebach, D. Chem. Ber. 1985, 118, 764.
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Laube, T.1
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31
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84984245609
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It has been reported that nitrogen of amide Li-enolates is completely tetrahedralized. (a) Laube, T.; Dunitz, J. D. Seebach, D. Helv. Chim. Acta 1985, 68, 1373. (b) Bauer, W.; Laube, T.; Seebach, D. Chem. Ber. 1985, 118, 764.
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32
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0342432395
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note
-
The stereochemistries of the products were determined on the basis of NOE experiments.
-
-
-
-
33
-
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0343301938
-
-
note
-
The stereochemistries of cis- and trans-5b were determined after conversion to benzoate 6b, because cis- and trans-6b can be easily separated in comparison with cis- and trans-5b (Scheme 6).
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-
-
-
34
-
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0343737473
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note
-
1H NMR.
-
-
-
-
36
-
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0343301937
-
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note
-
Separation of the cis- and trans-13 was easily carried out in comparison with that of cis- and trans-12.
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37
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0019932198
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Kronenthal, D. R.; Han, C. Y.; Taylor, M. K. J. Org. Chem. 1982, 47, 2765.
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