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Volumn 72, Issue 24, 2007, Pages 9121-9133

A mechanistic investigation of the asymmetric Meerwein-Schmidt-Ponndorf- Verley reduction catalyzed by BINOL/AlMe3 - Structure, kinetics, and enantioselectivity

Author keywords

[No Author keywords available]

Indexed keywords

ENANTIOSELECTIVITY; MICROSTRUCTURE; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; REACTION KINETICS;

EID: 36649013412     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo070563u     Document Type: Article
Times cited : (37)

References (48)
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    • 3).
    • 3).
  • 27
    • 36649023861 scopus 로고    scopus 로고
    • This dimeric aluminum complex is similar in bonding structure to those reported by the Lin group see refs 15 and 16
    • This dimeric aluminum complex is similar in bonding structure to those reported by the Lin group (see refs 15 and 16).
  • 31
    • 36649000406 scopus 로고    scopus 로고
    • While the (S)-BINOL/AlMe3/2-propanol mixture and (S)-2/2-propanol mixtures have slightly different 27Al resonances 28 and 30 ppm, respectively, this difference is not significant given the inherent broadness of the 27Al NMR signals.28,29
    • 28,29
  • 32
    • 36649024523 scopus 로고    scopus 로고
    • For this kinetic study, the initial rate of reaction was determined by GC analysis of aliquots taken from the reaction mixture at the appropriate time. Rate constants were determined from a plot of product yield versus time up to 20% yield.
    • For this kinetic study, the initial rate of reaction was determined by GC analysis of aliquots taken from the reaction mixture at the appropriate time. Rate constants were determined from a plot of product yield versus time up to 20% yield.
  • 34
    • 0003516749 scopus 로고    scopus 로고
    • 6th ed, W. H. Freeman and Company: New York
    • Atkins, P. W. Physical Chemistry, 6th ed.; W. H. Freeman and Company: New York, 1998; p 766.
    • (1998) Physical Chemistry , pp. 766
    • Atkins, P.W.1
  • 36
    • 36649001938 scopus 로고    scopus 로고
    • The slight deviation from linearity observed at higher substrate concentrations is presumably due to reaction conditions that are no longer strictly pseudo first-order ca. only 6-fold excess of 2-propanol
    • The slight deviation from linearity observed at higher substrate concentrations is presumably due to reaction conditions that are no longer strictly pseudo first-order (ca. only 6-fold excess of 2-propanol).
  • 37
    • 0012546077 scopus 로고    scopus 로고
    • For recent examples of Oppenauer oxidation protocols see: a
    • For recent examples of Oppenauer oxidation protocols see: (a) Ooi, T.; Otsuka, H.; Miura, T.; Ichikawa, H.; Maruoka, K. Org. Lett. 2002, 4, 2669-2672.
    • (2002) Org. Lett , vol.4 , pp. 2669-2672
    • Ooi, T.1    Otsuka, H.2    Miura, T.3    Ichikawa, H.4    Maruoka, K.5
  • 44
    • 36648999742 scopus 로고    scopus 로고
    • We originally proposed that a tetracoordinate intermediate was operative for the BINOL/AlMe3/2-propanol system. On the basis of data showing reduced ee,19 we suggested a pentacoordinate intermediate for the MSPV reduction employing the 5/AlMe3/2-propanol combination and a hexacoordinate intermediate for the 6/AlMe3/2-propanol combination, and that these higher coordination intermediates resulted in inferior asymmetric catalysts
    • 3/2-propanol combination, and that these higher coordination intermediates resulted in inferior asymmetric catalysts.
  • 45
    • 36648999967 scopus 로고    scopus 로고
    • 27Al NMR spectra, further supporting this hypothesis.
    • 27Al NMR spectra, further supporting this hypothesis.
  • 46
    • 0001065963 scopus 로고    scopus 로고
    • King, S. A.; Thompson, A.; S.; King, A. O.; Verhoeven, T. R. J. Org. Chem. 1992, 57, 6689-6691.
    • King, S. A.; Thompson, A.; S.; King, A. O.; Verhoeven, T. R. J. Org. Chem. 1992, 57, 6689-6691.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.