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For a review of the heterobimetallic asymmetric catalysts, see; Shibasaki, M.; Sasai, H.; Arai, T. Angew. Chem. Int. Ed. 1997, 36, 1236-1256.
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b) Gröger, H.; Vogl, E. M.; Shibasaki, M. Chem. Eur. J. 1998, 4, 1137-1141. Recently we developed a direct catalytic asymmetric aldol reactions promoted by a novel barium complex, see: Yamada, Y. M. A.; Shibasaki, M. Tetrahedron Lett. 1998, 39, 5561-5564.
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b) Gröger, H.; Vogl, E. M.; Shibasaki, M. Chem. Eur. J. 1998, 4, 1137-1141. Recently we developed a direct catalytic asymmetric aldol reactions promoted by a novel barium complex, see: Yamada, Y. M. A.; Shibasaki, M. Tetrahedron Lett. 1998, 39, 5561-5564.
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17
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0000042562
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For other examples for catalytic asymmetric nitroaldol reactions using the hydrated LnLB (Ln = lanthanoid) complexes, see; b) Takaoka, E.; Yoshikawa, N.; Yamada Y. M. A.; Sasai H.; Shibasaki, M. Hetemcycles 1997, 46, 157-163;
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20
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85069277595
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The reaction in THF afforded 4 with lower ee than that in toluene
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The reaction in THF afforded 4 with lower ee than that in toluene.
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22
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85069283893
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4, and following separation of the resultant diastereomers
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4, and following separation of the resultant diastereomers.
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23
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f) Iida, T. Yamamolo, N.; Matsunaga, S.; Woo, H.-G.; Shibasaki, M. Angew. Chem. Int. Ed. 1998, 2223-2226.
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36
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85069282726
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Although the absolute configurations of 11-13 have not been determined at the present time, we suggest (S)-configuration similar to compound 14 because of analogies of their molecular modeling studies for the transition state
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Although the absolute configurations of 11-13 have not been determined at the present time, we suggest (S)-configuration similar to compound 14 because of analogies of their molecular modeling studies for the transition state.
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37
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85069279630
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All of those Mannich bases showed a tendency to racemize during colomn choromatograpy (silica gel or alumina)
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All of those Mannich bases showed a tendency to racemize during colomn choromatograpy (silica gel or alumina).
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