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Volumn , Issue 1, 1999, Pages 61-65

Reversal diastereofacial selectivity in the n-butyllithium addition to O-protected n-trimethylsilylimines of (2S)-lactal: Enthalpic versus entropic contributions

Author keywords

Imines; Nucleophilic addition; Reversal of diastereoselectivity; Solvent effect; Temperature effect

Indexed keywords

IMINE; N BUTYLLITHIUM; N TRIMETHYLSILYLIMINE; SOLVENT; UNCLASSIFIED DRUG;

EID: 0032795207     PISSN: 1434193X     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1099-0690(199901)1999:1<61::AID-EJOC61>3.0.CO;2-P     Document Type: Article
Times cited : (23)

References (44)
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    • The diastereoselectivity of the product formation is characterized by the de value of the anti adduct, which was determined by GC analysis of the crude product, or of the corresponding N-trifluoroacetamides, according to the procedure reported in: T. W. Greene, P. G. M. Wuts Protective Groups in Organic Synthesis. Wiley, New York, 1991, 353.
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    • For a review see: [10a] H. Buschmann, H.-D. Scharf, N. Hoffmann, P. Esser, Angew. Chem. 1991, 103, 480; Angew. Chem., Int. Ed. Engl. 1991, 30, 477.
    • (1991) Angew. Chem., Int. Ed. Engl. , vol.30 , pp. 477
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    • inv, which is probably related to a re-organization of the solvation shell, as indicated by the correlation with melting points of a series of hydrocarbon solvents in the case of the nBuLi addition to 2-phenyl-propanal, cfr.: G. Cainelli, D. Giacomini, P. Galletti, A. Marini, Angew. Chem., Int. Ed. Engl. 1996, 35, 2849.
    • (1996) Angew. Chem., Int. Ed. Engl. , vol.35 , pp. 2849
    • Cainelli, G.1    Giacomini, D.2    Galletti, P.3    Marini, A.4
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    • The preponderant formation of syn isomers is generally attributed to a chelated transition state (chelation control), while the anti isomer should arise from an open-chain transition state (non-chelation control). See for instance [14a] M. T. Reetz, Acc. Chem. Res. 1993, 26, 462.
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    • However, the chelated transition state should be more rigid and more ordered than the open-chain one
    • [14b] M. T. Reetz Angew. Chem., Int. Ed. Engl. 1991, 30, 556. However, the chelated transition state should be more rigid and more ordered than the open-chain one.
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    • Reetz, M.T.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.