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Volumn 132, Issue 13, 2010, Pages 4925-4934

Heterobimetallic transition metal/rare earth metal bifunctional catalysis: A Cu/Sm/schiff base complex for Syn -selective catalytic asymmetric nitro-mannich reaction

Author keywords

[No Author keywords available]

Indexed keywords

ASYMMETRIC SYNTHESIS; BIFUNCTIONAL CATALYSIS; CATALYST PREPARATION; GENERATION SYSTEMS; HETEROBIMETALLICS; MECHANISTIC STUDIES; NITRO-MANNICH REACTION; SCHIFF BASE COMPLEXES; SCHIFF-BASE;

EID: 77950843616     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja100514y     Document Type: Article
Times cited : (205)

References (106)
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    • For selected examples of enantioselective nitro-Mannich reactions with nitromethane, see
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    • In this manuscript, anti -nitro-Mannich adduct and syn -nitro-Mannich adduct are defined as shown in Scheme 1. In refs 14-17, diastereomers are sometimes defined in the opposite way
    • In this manuscript, anti -nitro-Mannich adduct and syn -nitro-Mannich adduct are defined as shown in Scheme 1. In refs 14-17, diastereomers are sometimes defined in the opposite way.
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    • After our preliminary communication on the first syn -selective reaction in ref 8, an organocatalytic syn -selective method using nitroethane was reported very recently
    • After our preliminary communication on the first syn -selective reaction in ref 8, an organocatalytic syn -selective method using nitroethane was reported very recently: Jiang, X., Zhang, Y., Wu, L., Zhang, G., Liu, X., Zhang, H., Fu, D., and Wang, R. Adv. Synth. Catal 2009, 351, 2096
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    • For the successful use of aliphatic imines in nitro-Mannich reaction via in situ generation of aliphatic imines from α-amido sulfones, see refs 13b and 17
    • For the successful use of aliphatic imines in nitro-Mannich reaction via in situ generation of aliphatic imines from α-amido sulfones, see refs 13b and 17.
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    • 154Sm: 22.7%. The peaks at m/z 1710 were 0.5 mass units apart in ESI-TOF-MS analysis. Judging from the peak distribution patterns, the peak at m/z 1710 was speculated to be composed of a mixture of a dicationic hexamer as well as a monocationic trimer. Other peaks were assigned in analogy based on m / z as well as the peak distribution pattern. See the Supporting Information for the ESI-TOF-MS spectra
    • 154Sm: 22.7%. The peaks at m/z 1710 were 0.5 mass units apart in ESI-TOF-MS analysis. Judging from the peak distribution patterns, the peak at m/z 1710 was speculated to be composed of a mixture of a dicationic hexamer as well as a monocationic trimer. Other peaks were assigned in analogy based on m / z as well as the peak distribution pattern. See the Supporting Information for the ESI-TOF-MS spectra.
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    • The difference in the reaction rate with and without 4- t Bu-phenol additive also supported our assumption. The reaction rate in the absence of 4- t Bu-phenol was 3.6-fold faster than that with 4- t Bu-phenol. See the Supporting Information for detailed experimental data
    • The difference in the reaction rate with and without 4- t Bu-phenol additive also supported our assumption. The reaction rate in the absence of 4- t Bu-phenol was 3.6-fold faster than that with 4- t Bu-phenol. See the Supporting Information for detailed experimental data.
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    • Kinetic data of the order in catalyst also matched well with ESI-MS analysis. In the presence of 4- t Bu-phenol additive, the order was slightly lower than 1st (0.9th order, Figure 6), suggesting that trimer and higher order aggregates would exist in equilibrium and the trimer complex would be the active species. In contrast, the order in catalyst was greater than 1st (2.0nd order, see the Supporting Information) in the absence of 4- t Bu-phenol additive. The data implied that trimer and higher order aggregates would exist in equilibrium and higher order aggregates would participate in the reaction in the absence of 4- t Bu-phenol
    • Kinetic data of the order in catalyst also matched well with ESI-MS analysis. In the presence of 4- t Bu-phenol additive, the order was slightly lower than 1st (0.9th order, Figure 6), suggesting that trimer and higher order aggregates would exist in equilibrium and the trimer complex would be the active species. In contrast, the order in catalyst was greater than 1st (2.0nd order, see the Supporting Information) in the absence of 4- t Bu-phenol additive. The data implied that trimer and higher order aggregates would exist in equilibrium and higher order aggregates would participate in the reaction in the absence of 4- t Bu-phenol.
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    • 3, gave much less satisfactory reactivity. See Table 5, entries 3-5
    • 3, gave much less satisfactory reactivity. See Table 5, entries 3-5.
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    • 13 was not observed
    • 13 was not observed.
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    • See the Supporting Information for the modified procedure
    • Song, J., Wang, Y., and Deng, Li. J. Am. Chem. Soc. 2006, 128, 6048 See the Supporting Information for the modified procedure
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    • Song, J.1    Wang, Y.2    Deng, Li.3


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