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Volumn 49, Issue 36, 2010, Pages 6373-6377

Enamine versus oxazolidinone: What controls stereoselectivity in proline-catalyzed asymmetric aldol reactions?

Author keywords

Aldol reaction; Density functional calculations; Diastereoselectivity; Organocatalysis; Reaction mechanisms

Indexed keywords

ALDOL REACTIONS; DENSITY-FUNCTIONAL CALCULATIONS; DIASTEREOSELECTIVITY; ORGANOCATALYSIS; REACTION MECHANISM;

EID: 77956054438     PISSN: 14337851     EISSN: 15213773     Source Type: Journal    
DOI: 10.1002/anie.201001588     Document Type: Article
Times cited : (91)

References (70)
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    • Oxazolidinone has been known to be a parasitic dead end as it proposed to decrease the concentration of the active iminium ion. See references dand ].
    • Oxazolidinone has been known to be a parasitic dead end as it proposed to decrease the concentration of the active iminium ion. See references dand ].
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    • See the Supporting Information for full details of the computational methods
    • See the Supporting Information for full details of the computational methods.
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    • The B3LYP functional is known to be quite successful in studying stereoselectivity in organocatalytic reactions. For examples, see references [11a]and [12b]
    • The B3LYP functional is known to be quite successful in studying stereoselectivity in organocatalytic reactions. For examples, see references 1aand 2band P. H.-Y. Cheong, K. N. Houk, J. Am. Chem. Soc. 2004, 126, 13912-13913.
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    • -1. See Table S2 and Figure S4 in the Supporting Information for further details
    • -1. See Table S2 and Figure S4 in the Supporting Information for further details.
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    • -1, respectively, for 3a and 3b
    • -1, respectively, for 3a and 3b.
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    • The endo/exo nomenclature is assigned on the basis of the orientation of the ethyl group with respect to the bicyclic oxazolidinone ring
    • The endo/exo nomenclature is assigned on the basis of the orientation of the ethyl group with respect to the bicyclic oxazolidinone ring.
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    • A comparative energy profile diagram is provided in Figure S2 in the Supporting Information
    • A comparative energy profile diagram is provided in Figure S2 in the Supporting Information.
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    • Note that the generation of 3 from proline and propanal involves the release of a molecule of water in the dehydration step
    • Note that the generation of 3 from proline and propanal involves the release of a molecule of water in the dehydration step.
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    • We and others have earlier demonstrated the energetic advantages associated with water-assisted proton transfers in organocatalytic reactions
    • We and others have earlier demonstrated the energetic advantages associated with water-assisted proton transfers in organocatalytic reactions.
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    • The likely involvement of 1) water, 2) base, or 3) solvent in the assisted proton transfer is examined
    • The likely involvement of 1) water, 2) base, or 3) solvent in the assisted proton transfer is examined.
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    • 3)DMF
    • 3)DMF.
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    • In the lower-energy TSs, the developing charge on the alkoxide moiety of propanal benefits from the stabilization offered by the carboxylic acid group. See Figure S6 in the Supporting Information
    • In the lower-energy TSs, the developing charge on the alkoxide moiety of propanal benefits from the stabilization offered by the carboxylic acid group. See Figure S6 in the Supporting Information.
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    • [13]). The present discrepancy could perhaps be attributed to such known limitations. Furthermore, this functional is predominantly calibrated against thermodynamic, not kinetic, quantities such as those reported here
    • [13]). The present discrepancy could perhaps be attributed to such known limitations. Furthermore, this functional is predominantly calibrated against thermodynamic, not kinetic, quantities such as those reported here.
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    • The optimized geometries of solvent (or base)-assisted conversion of 3 to 4 or 8 are provided in Figure S5 in the Supporting Information
    • The optimized geometries of solvent (or base)-assisted conversion of 3 to 4 or 8 are provided in Figure S5 in the Supporting Information.
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    • 77956026822 scopus 로고    scopus 로고
    • The optimized TS geometries for additional stereochemical possibilities are provided in Figure S7 in the Supporting Information
    • The optimized TS geometries for additional stereochemical possibilities are provided in Figure S7 in the Supporting Information.
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    • -1 higher in energy
    • -1 higher in energy.
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    • See Tables S6 and S7 and Figure S8 in the Supporting Information
    • See Tables S6 and S7 and Figure S8 in the Supporting Information.
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    • -1. See also Table S5 in the Supporting Information
    • -1. See also Table S5 in the Supporting Information.
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    • (180), responsible for the diastereomeric products
    • (180), responsible for the diastereomeric products.
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    • See Tables S6 and S7 in the Supporting Information for further details
    • See Tables S6 and S7 in the Supporting Information for further details.
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    • Further details on other possible geometries of 9a/9b are provided in Figure S9 and Tables S9 and S10 in the Supporting Information
    • Further details on other possible geometries of 9a/9b are provided in Figure S9 and Tables S9 and S10 in the Supporting Information.
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    • -1 in the solvent phase
    • -1 in the solvent phase.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.