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Volumn 74, Issue 11, 2009, Pages 4217-4224

Stereoselective control of planar α-dimethylsulfonium benzyl carbanions. Synthesis of optically pure trans-aziridines

Author keywords

[No Author keywords available]

Indexed keywords

AZIRIDINES; CHEMICAL EQUATIONS; DIASTEREO-SELECTIVITY; RELATIVE STABILITIES; STEREOSELECTIVE CONTROL; SULFONIUM SALTS; SULFUR ATOMS; THEORETICAL CALCULATIONS; TRANS-SELECTIVITY; TRANSITION STATE;

EID: 66249113529     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo900381b     Document Type: Article
Times cited : (21)

References (65)
  • 5
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    • See also 1a,1d, and 1f
    • (c) Müller, P.; Fruit, C. Chem. Rev. 2003, 103, 2905. See also 1a,1d, and 1f.
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  • 21
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    • For a review, see: and references therein
    • For a review, see: (a) Dai, L.-X.; Hou, X.-L.; Zhou, Y.-G. Pure Appl. Chem. 1999, 71, 369, and references therein
    • (1999) Pure Appl. Chem. , vol.71 , pp. 369
    • Dai, L.-X.1    Hou, X.-L.2    Zhou, Y.-G.3
  • 45
    • 66249141207 scopus 로고    scopus 로고
    • The complete removal of the residual silver salts is critical for obtaining good results in the aziridination step since their presence results in the formation of black reaction crudes and strongly decreases the diastereoselectivity
    • The complete removal of the residual silver salts is critical for obtaining good results in the aziridination step since their presence results in the formation of black reaction crudes and strongly decreases the diastereoselectivity.
  • 48
    • 66249125277 scopus 로고    scopus 로고
    • CCDC 719589 contains the supplementary crystallographic data for this compound. These data can be obtained free of charge via Unpublished results
    • CCDC 719589 contains the supplementary crystallographic data for this compound. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data- request/cif. Unpublished results.
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    • Geometries have been fully optimized using the standard 6-31G(d) basis set for all the atoms
    • Geometries have been fully optimized using the standard 6-31G(d) basis set for all the atoms: (a) Ditchfield, R.; Hehre, W. J.; Pople, J. A. J. Chem. Phys. 1971, 54, 724.
    • (1971) J. Chem. Phys. , vol.54 , pp. 724
    • Ditchfield, R.1    Hehre, W.J.2    Pople, J.A.3
  • 58
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    • Frequencies and zero-point energy (ZPE) were also computed at the same level of theory. Final energies have been obtained using the more extended 6-311+G** basis set for all atoms
    • Frequencies and zero-point energy (ZPE) were also computed at the same level of theory. Final energies have been obtained using the more extended 6-311+G** basis set for all atoms: (b) McLean, A. D.; Chandler, G. S. J. Chem. Phys. 1980, 72, 5639.
    • (1980) J. Chem. Phys. , vol.72 , pp. 5639
    • McLean, A.D.1    Chandler, G.S.2
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    • 0031209054 scopus 로고    scopus 로고
    • Relative free energies (in kcal/mol) were evaluated at the B3LYP/6-311+G** level with ZPE and entropy corrections evaluated at 298 K using the frequencies previously calculated at B3LYP/6-31G(d) level. Because of the importance of solvent effects, especially when charged species are involved, model structures I-IV have also been optimized in a dielectric medium mimicking THF, using the IEF-PCM model: (d) Cancès, M. T.; Mennucci, B.; Tomasi, J. J. Chem. Phys. 1997, 107, 3032.
    • (1997) J. Chem. Phys. , vol.107 , pp. 3032
    • Cancès, M.T.1    Mennucci, B.2    Tomasi, J.3
  • 61
    • 0032502372 scopus 로고    scopus 로고
    • In the case of model transition states, this optimization including solvent effects was not possible
    • (e) Cossi, M.; Barone, V.; Mennucci, B.; Tomasi, J. Chem. Phys. Lett. 1998, 286, 253. In the case of model transition states, this optimization including solvent effects was not possible. .
    • (1998) Chem. Phys. Lett. , vol.286 , pp. 253
    • Cossi, M.1    Barone, V.2    Mennucci, B.3    Tomasi, J.4
  • 62
    • 66249140487 scopus 로고    scopus 로고
    • Complexes varying C-S-O-Li and C-C-S-O dihedral bonds as well as a boat-like structure with Li atom bonded to benzylic carbon resulted in less stability (see Supporting Information complexes Ib-Id)
    • Complexes varying C-S-O-Li and C-C-S-O dihedral bonds as well as a boat-like structure with Li atom bonded to benzylic carbon resulted in less stability (see Supporting Information complexes Ib-Id).
  • 63
    • 66249117214 scopus 로고    scopus 로고
    • +, the more favored the planar free carbanion conformation
    • +, the more favored the planar free carbanion conformation.
  • 64
    • 66249094465 scopus 로고    scopus 로고
    • -1 less stable than the corresponding cisoid one (TS1b). Probably the transoid approach in our case is destabilized due to steric interactions with the ortho TolSO group in the ylide
    • -1 less stable than the corresponding cisoid one (TS1b). Probably the transoid approach in our case is destabilized due to steric interactions with the ortho TolSO group in the ylide.
  • 65
    • 66249083737 scopus 로고    scopus 로고
    • The optimization of this type of transition states has not been still possible due to the high degree of conformational freedom shown by all the ligands around the metal. It is being tried with a simple substrate
    • The optimization of this type of transition states has not been still possible due to the high degree of conformational freedom shown by all the ligands around the metal. It is being tried with a simple substrate.


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