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Volumn , Issue 23, 2002, Pages 3986-3994

Catalysed asymmetric protonation of simple linear keto-enolic species a route to chiral α-arylpropionic acids

Author keywords

Alkaloids; Asymmetric catalysis; Cleavage reactions; Decarboxylation; Protonation

Indexed keywords

ALKALOID; CINCHONINE; KETONE; PROPIONIC ACID DERIVATIVE;

EID: 0036898724     PISSN: 1434193X     EISSN: None     Source Type: Journal    
DOI: 10.1002/1099-0690(200212)2002:23<3986::AID-EJOC3986>3.0.CO;2-L     Document Type: Article
Times cited : (41)

References (66)
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    • For a discussion of acidity effects in asymmetric protonation, see: E. Vedejs, A. W. Kruger, E. Suna, J. Org. Chem. 1999, 64, 7863-7870.
    • (1999) J. Org. Chem. , vol.64 , pp. 7863-7870
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    • note
    • In both cases we only observed degradation of the starting material, probably due to retro-Claisen-type reactions.
  • 40
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    • A syn relative configuration has been determined for the diastereomer in slight excess (ca. 55 ± 3%) which can be compared with analogous values observed for 5a resulting from the hydride reduction of 4a: C. Alvarez Ibarra, F. Fernandez Gonzalez, M. L. Quiroga Feijoo, J. Santoro, An. Qium. 1978, 74, 449-454; C. Ivarez Ibarra, R. Pérez-Ossorio, M. L. Quiroga, M. S. Arias Pérez, M. J. Fernandez Dominguez, J. Chem. Soc., Perkin Trans. 2 1988, 101-105.
    • (1978) An. Qium. , vol.74 , pp. 449-454
    • Alvarez Ibarra, C.1    Fernandez Gonzalez, F.2    Quiroga Feijoo, M.L.3    Santoro, J.4
  • 41
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    • A syn relative configuration has been determined for the diastereomer in slight excess (ca. 55 ± 3%) which can be compared with analogous values observed for 5a resulting from the hydride reduction of 4a: C. Alvarez Ibarra, F. Fernandez Gonzalez, M. L. Quiroga Feijoo, J. Santoro, An. Qium. 1978, 74, 449-454; C. Ivarez Ibarra, R. Pérez-Ossorio, M. L. Quiroga, M. S. Arias Pérez, M. J. Fernandez Dominguez, J. Chem. Soc., Perkin Trans. 2 1988, 101-105.
    • (1988) J. Chem. Soc. Perkin Trans. 2 , pp. 101-105
    • Ivarez Ibarra, C.1    Pérez-Ossorio, R.2    Quiroga, M.L.3    Arias Pérez, M.S.4    Fernandez Dominguez, M.J.5
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    • M. Dekker, New York, chapters 2, 3, 9
    • The selectivities are greatly influenced by the nature of the support, as observed in some of our previous experiments[23] and as discussed in, for example: R. L. Augustine, Heterogenous Catalysis for the Synthetic Chemist, M. Dekker, New York, 1996, chapters 2, 3, 9.
    • (1996) Heterogenous Catalysis for the Synthetic Chemist
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    • (Eds.: A. N. Collins, G. N. Sheldrake, G. Crosby), Wiley, Chichester
    • G. P. Stahly, M. R. Starrett, Chirality in Industry II, (Eds.: A. N. Collins, G. N. Sheldrake, G. Crosby), Wiley, Chichester, 1997, p. 19-40.
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    • This concept of the control of an electrophilic attack of an enolic species by the enol-bound groups was developed by Duhamel, and here we have adopted an "α' and β'" nomenclature for the enol definition (Figures 3 and 4) to avoid confusion with α- and β-positions of the carbonyl group: [33a] L. Duhamel, P. Duhamel, C. R. Acad. Sci. Paris, Série II 1995, 320, 689-694.
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  • 57
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    • Such a correlation has already been observed during the asymmetric protonation of enolates derived from Schiff bases: L. Duhamel, J.-C. Plaquevent, Bull. Soc. Chim. Fr. 1982, 11, 75-83.
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    • note
    • R correspond to the rate of formation of the enantiomers, assumed to be proportional to their respective concentrations.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.