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Volumn 133, Issue 28, 2011, Pages 10790-10802

Diastereodivergent behavior of alkyl versus cyano allenylcuprates toward aldehydes: A key role for lithium

Author keywords

[No Author keywords available]

Indexed keywords

COPPER COMPOUNDS; LITHIUM;

EID: 79960247919     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja200702a     Document Type: Article
Times cited : (17)

References (130)
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    • Attempts to add neat aldehyde at -90 or -60 °C resulted in a decrease of the selectivity and a lower yield due to the formation of numerous side products.
    • Attempts to add neat aldehyde at -90 or -60 °C resulted in a decrease of the selectivity and a lower yield due to the formation of numerous side products.
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    • 1H NMR of the crude mixture, which indicates a complete transmetalation.
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    • 2], a lower 70/30 syn / anti ratio (83% yield) is obtained, whereas the non-transmetalated ALi species gives regioselectively the desired homopropargylic alcohols (70% yield) in a 40/60 syn / anti ratio
    • 2], a lower 70/30 syn / anti ratio (83% yield) is obtained, whereas the non-transmetalated ALi species gives regioselectively the desired homopropargylic alcohols (70% yield) in a 40/60 syn / anti ratio
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    • + interacts with the CN π system or the Cu-C bond without interaction with the allyl ligand all failed.
    • + interacts with the CN π system or the Cu-C bond without interaction with the allyl ligand all failed.
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    • The effect of the bulk of the solvent was examined by carrying out a single-point energy calculation using a continuous description of the solvent (see computational details for exact description); no significant effect was observed, so results without solvation are given here. These data are given in the Supporting Information.
    • The effect of the bulk of the solvent was examined by carrying out a single-point energy calculation using a continuous description of the solvent (see computational details for exact description); no significant effect was observed, so results without solvation are given here. These data are given in the Supporting Information.
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    • Partial coordination of the lithium to the allenic π system stabilizes the electron pair and thus diminishes its nucleophilicity.
    • Partial coordination of the lithium to the allenic π system stabilizes the electron pair and thus diminishes its nucleophilicity.
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    • The originality of these mechanisms leads to unusual geometrical structures for the TSs. See Supporting Information for full discussion.
    • The originality of these mechanisms leads to unusual geometrical structures for the TSs. See Supporting Information for full discussion.
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    • Crystallographic data for the structural analysis of anti - 6 have been deposited with the Cambridge Crystallographic Data Center, no. CCDC 720316.
    • Crystallographic data for the structural analysis of anti-6 have been deposited with the Cambridge Crystallographic Data Center, no. CCDC 720316.
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    • Structure assigned by comparison of spectral data with anti - 5 and anti - 6.
    • Structure assigned by comparison of spectral data with anti-5 and anti-6.
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    • The use of allenyl(methyl)cuprate gave a lower 55/45 syn / anti selectivity.
    • The use of allenyl(methyl)cuprate gave a lower 55/45 syn / anti selectivity.
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    • Addition of the allenyl(cyano)cuprate obtained from the silyl analogue of 1a on isobutyraldehyde gives a 8/92 syn / anti ratio, see ref 5d
    • Addition of the allenyl(cyano)cuprate obtained from the silyl analogue of 1a on isobutyraldehyde gives a 8/92 syn / anti ratio, see ref 5d.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.