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Volumn , Issue 17, 2005, Pages 3749-3760

Palladium-catalyzed C-S bond formation: Rate and mechanism of the coupling of aryl or vinyl halides with a thiol derived from a cysteine

Author keywords

Atropisomerism; C S coupling; Kinetics; Palladium; Reaction mechanisms

Indexed keywords


EID: 25144450792     PISSN: 1434193X     EISSN: None     Source Type: Journal    
DOI: 10.1002/ejoc.200500227     Document Type: Article
Times cited : (55)

References (44)
  • 4
    • 0002050854 scopus 로고
    • For the formation of C-S bonds by palladium-catalyzed cross-coupling reactions, see also: a) M. Kosugi, T. Shimizu, T. Migita, Chem. Lett. 1978, 13-14;
    • (1978) Chem. Lett. , pp. 13-14
    • Kosugi, M.1    Shimizu, T.2    Migita, T.3
  • 8
    • 0037204954 scopus 로고    scopus 로고
    • e) G. Y. Li, J. Org. Chem. 2002, 67, 3643-3650;
    • (2002) J. Org. Chem. , vol.67 , pp. 3643-3650
    • Li, G.Y.1
  • 10
    • 0345708168 scopus 로고    scopus 로고
    • For recent reviews on the formation of C-S bonds using copper-catalyzed reactions, see: a) S. V. Ley, A. W. Thomas, Angew. Chem. Int. Ed. 2003, 42, 5400-5449;
    • (2003) Angew. Chem. Int. Ed. , vol.42 , pp. 5400-5449
    • Ley, S.V.1    Thomas, A.W.2
  • 14
    • 25144471531 scopus 로고    scopus 로고
    • note
    • i is generated.
  • 15
    • 25144452222 scopus 로고    scopus 로고
    • [23]
    • [23];
  • 17
    • 25144497875 scopus 로고    scopus 로고
    • note
    • 0] = 4 mM, acetone, 30°C);
  • 18
    • 25144478755 scopus 로고    scopus 로고
    • note
    • 0(dba)(dppf) to PhI, whose observed rate constant has been determined in this work (see text and Figure 1), proceeds faster than its reaction with the second dppf ligand. In other words, in the catalytic reaction, the kinetics of the oxidative addition reaction will not be perturbed by the presence of the second dppf ligand, except at the very end of the catalytic reaction when the concentration of PhI is very low.
  • 22
    • 25144462443 scopus 로고    scopus 로고
    • note
    • "met." is then similar to the former one expressed above;
  • 23
    • 25144473389 scopus 로고    scopus 로고
    • note
    • 3 and RSH concentrations (155 mM and 107 mM, respectively) used in the catalytic reactions than for the concentrations investigated here (13.3 mM each);
  • 24
    • 25144461945 scopus 로고    scopus 로고
    • note
    • [15]
  • 28
    • 25144434192 scopus 로고    scopus 로고
    • note
    • 3, we did not try to investigate the effect of dba on the reductive elimination rate to fit the conditions of the catalytic reactions.
  • 29
    • 25144490498 scopus 로고    scopus 로고
    • note
    • red.elim.[4]. It depends only on the concentration of 4. When investigated independently of the previous reactions, the rate of this reaction does not depend on the concentrations of the other reagents of the catalytic reaction. But in the course of the catalytic reaction, the concentration of 4 will depend on the kinetics of the previous reactions:
  • 30
    • 25144467329 scopus 로고    scopus 로고
    • note
    • 0] = [3] = [4];
  • 31
    • 25144499469 scopus 로고    scopus 로고
    • note
    • 0] = [3] = [4];
  • 32
    • 85056017719 scopus 로고    scopus 로고
    • note
    • -1 when [PhI] = 13.5 mM, corresponding to 82% conversion.
  • 33
    • 25144447226 scopus 로고    scopus 로고
    • note
    • 0 = 0.
  • 37
    • 25144503753 scopus 로고    scopus 로고
    • note
    • 6]acetone): δ = 9.0 (d, J = 31 Hz, 1 P), 27.7 (d, J = 31 Hz, 1 P) ppm;
  • 38
    • 25144466836 scopus 로고    scopus 로고
    • note
    • 6]-acetone): δ = 14.4 (d, J = 32 Hz, 0.5 P), 25.6 (d, J = 32 Hz, 0.5 P). 14.7 (d, J = 32Hz, 0.5 P), 25.6 (d, J = 32 Hz, 0.5 P) ppm;
  • 39
    • 25144436789 scopus 로고    scopus 로고
    • note
    • [19b]) were indeed the results of an atropisomerism due to the bulkiness of the vinyl group and associated with the chirality of the vinyl chain and/ or that of the R group of the cysteine-derived thiol 1.
  • 40
    • 25144432234 scopus 로고    scopus 로고
    • note
    • Since one diastereoisomer was more reactive than the other, the two sets of doublets could be distinguished, the doublets gathered two by two and assigned to either 9 or 10.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.