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59949102927
-
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Cu-Box, La-PyBox, urea-type organocatalyst, and cinchona alkaloids were screened in catalytic asymmetric amination of 1. The observed enantioselectivities were less than 30% ee. See also ref 6.
-
Cu-Box, La-PyBox, urea-type organocatalyst, and cinchona alkaloids were screened in catalytic asymmetric amination of 1. The observed enantioselectivities were less than 30% ee. See also ref 6.
-
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31
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33748413162
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For recent selected examples of small peptide-based asymmetric catalysis, see:a
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59949101452
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Sigma-Aldrich Handbook of Fine Chemicals 2007-2008.
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Sigma-Aldrich Handbook of Fine Chemicals 2007-2008.
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36
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59949086932
-
-
Bulk purchase may lower the cost
-
Bulk purchase may lower the cost.
-
-
-
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37
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-
0037433497
-
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For recent selected examples for the use of lanthanide nitrates for asymmetric catalysis, see:a
-
For recent selected examples for the use of lanthanide nitrates for asymmetric catalysis, see:(a) Hamada, T.; Manabe, K.; Ishikawa, S.; Nagayama, S.; Shiro, M.; Kobayashi, S. J. Am. Chem. Soc. 2003, 125, 2989.
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38
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0347419459
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(b) Furuno, H; Hayano, T; Kambara, T; Sugimoto, Y; Hanamoto, T; Tanaka, Y; Jin, Y. Z; Kagawa, T; Inanaga, J. Tetrahedron 2003, 59, 10509.
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39
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0038412630
-
Lanthanide niterates exhibit much less catalytic efficiency compared with corresponding triflates. RAJIV11For example, see: (c) Kano, S; Nakano, H; Kojima, M; Baba, N; Nakajima, K
-
Lanthanide niterates exhibit much less catalytic efficiency compared with corresponding triflates. RAJIV11For example, see: (c) Kano, S; Nakano, H; Kojima, M; Baba, N; Nakajima, K. Inorg. Chim. Acta 2003, 349, 6.
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40
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0001045470
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For selected examples of rare earth metal asymmetric catalyst showing enhanced stereoselectivity in the presence of amine, see:(a) Kobayashi, S, Ishitani, H. J. Am. Chem. Soc. 1994, 116, 4083
-
For selected examples of rare earth metal asymmetric catalyst showing enhanced stereoselectivity in the presence of amine, see:(a) Kobayashi, S.; Ishitani, H. J. Am. Chem. Soc. 1994, 116, 4083.
-
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41
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0027963432
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(b) Kobayashi, S.; Ishitani, H.; Hachiya, I.; Araki, M. Tetrahedron 1994, 50, 11623.
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0037471466
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-
46
-
-
59949104641
-
-
2O was calculated as x = 4.
-
2O was calculated as x = 4.
-
-
-
-
47
-
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59949091636
-
-
A 25 g portion of di-tert-butyl azodicarboxylate was added five times during the first 5 min of the reaction. An additional 13.5 g was added 10 min after the last addition. The reaction was exothermic, and the reaction temperature varied from -5 to +8°C occasionally. The observed enantioselectivity was comparable to that obtained in small scale reactions likely because the enantioselectivity of the present amination is relatively insensitive to the reaction temperature.
-
A 25 g portion of di-tert-butyl azodicarboxylate was added five times during the first 5 min of the reaction. An additional 13.5 g was added 10 min after the last addition. The reaction was exothermic, and the reaction temperature varied from -5 to +8°C occasionally. The observed enantioselectivity was comparable to that obtained in small scale reactions likely because the enantioselectivity of the present amination is relatively insensitive to the reaction temperature.
-
-
-
-
48
-
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59949084460
-
-
Enantiomeric excess of 5 was determined after mono-Boc protection. See the Supporting Information for details.
-
Enantiomeric excess of 5 was determined after mono-Boc protection. See the Supporting Information for details.
-
-
-
-
50
-
-
59949084946
-
-
The Clarke number of lanthanum is 0.0018, almost equally abundant as zinc (0.004) or boron (0.001).
-
The Clarke number of lanthanum is 0.0018, almost equally abundant as zinc (0.004) or boron (0.001).
-
-
-
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