메뉴 건너뛰기




Volumn 126, Issue 23, 2004, Pages 7271-7280

Reaction pathway and stereoselectivity of asymmetric synthesis of chrysanthemate with the Aratani C1-symmetric salicylaldimine-copper catalyst

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSIS; COPPER; HYDROGEN BONDS; PROBABILITY DENSITY FUNCTION; STRUCTURE (COMPOSITION);

EID: 2942590316     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja031524c     Document Type: Article
Times cited : (48)

References (58)
  • 13
    • 2942542178 scopus 로고    scopus 로고
    • note
    • The Monsanto asymmetric hydrogenation (L-DOPA synthesis) and the Takasago asymmetric hydrogen transfer (l-menthol synthesis).
  • 47
    • 2942573898 scopus 로고    scopus 로고
    • note
    • carbene σ-orbital and C=O π*-orbital (data not shown).
  • 48
    • 2942542177 scopus 로고    scopus 로고
    • note
    • The Cartesian coordinates of optimized geometries and electronic energies for the TSs of (-)-trans- and (-)-cis-chrysanthemates are described as S-5 and S-6, respectively in Supporting Information.
  • 49
    • 2942548505 scopus 로고    scopus 로고
    • note
    • The Cartesian coordinates of optimized geometry and electronic energy for the TS of (+)-cis-chrysanthemate are described as S-7 in Supporting Information.
  • 50
    • 2942576982 scopus 로고    scopus 로고
    • note
    • carbene bond were calculated for the model below, where the intramolecular hydrogen bonding is neglected. The calculated free energy barriers are 12.3 and 13.2 kcal/ mol (two maxima owing to the relative orientation of the side chain and the ester group) by single-point calculations at the B3LYP/6-311+G(d,p) level with the optimized geometries and frequencies at the B3LYP/6-31 G(d) level. For comparison, the free energy barriers for the cyclopropanation were also calculated at the same level. For instance, those for 23 and 26 in Figure 6 are 12.9 and 12.1 kcal/mol, respectively. It may be noted that the comparable levels of the two activation energies obtained by the theoretical/ chemical model does not rigorously satisfy the Curtin-Hammet conditions that are assumed in the present study. Equation presented.
  • 51
    • 2942606935 scopus 로고    scopus 로고
    • note
    • The enantioselectivity calculated for the energy differences of the TSs at the B3LYP/6-311+G(d, p)//B3LYP/6-31G(d)+3-21G level was (+):(-) = 76.0:24.0 (Boltzmann distribution at 298 K), the same trend as in the text. The one based on the stability of the carbene complexes at the same level was (+):(-) = 28.8: 71.2, the trend again the same as in the text and hence contradictory with the experimental data. The original data on these one-point energies are shown in Figure S4 in Supporting Information.
  • 52
    • 2942545362 scopus 로고    scopus 로고
    • note
    • 3 is a methyl group in this study.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.