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Volumn 9, Issue 9, 2007, Pages 1651-1654

Intermolecular asymmetric reductive aldol reaction of ketones as acceptors promoted by chiral Rh(Phebox) catalyst

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EID: 34248360397     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol070251d     Document Type: Article
Times cited : (71)

References (42)
  • 1
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    • Matsuda, I. In Modern Rhodium-Catalyzed Organic Reactions; Evans, P. A., Ed.; Wiley-VCH: Weinheim, Germany, 2005; Chapter 6, pp 111-128. For the organocatalytic case:
    • (a) Matsuda, I. In Modern Rhodium-Catalyzed Organic Reactions; Evans, P. A., Ed.; Wiley-VCH: Weinheim, Germany, 2005; Chapter 6, pp 111-128. For the organocatalytic case:
  • 3
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    • Rh, Co, and Pd catalysts (nonasymmetric): [Rh]: (a) Revis, A.; Hilty, T. K. Tetrahedron Lett. 1987, 28, 4809-4812.
    • Rh, Co, and Pd catalysts (nonasymmetric): [Rh]: (a) Revis, A.; Hilty, T. K. Tetrahedron Lett. 1987, 28, 4809-4812.
  • 12
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    • For aldehyde mediated catalysis
    • (j) Han, S. B.; Krische, M. J. Org. Lett. 2006, 8, 5657-5660. For aldehyde mediated catalysis:
    • (2006) Org. Lett , vol.8 , pp. 5657-5660
    • Han, S.B.1    Krische, M.J.2
  • 20
    • 0033548542 scopus 로고    scopus 로고
    • Cu and In catalysts (nonasymmetric): [Cu]: (a) Ooi, T.; Doda, K.; Sakai, D.; Maruoka, K. Tetrahedron Lett. 1999, 40, 2133-2163.
    • Cu and In catalysts (nonasymmetric): [Cu]: (a) Ooi, T.; Doda, K.; Sakai, D.; Maruoka, K. Tetrahedron Lett. 1999, 40, 2133-2163.
  • 22
    • 4544221000 scopus 로고    scopus 로고
    • In
    • (c) Chiu, P. Synthesis 2004, 2210-2215. [In]:
    • (2004) Synthesis , pp. 2210-2215
    • Chiu, P.1
  • 25
    • 0034630894 scopus 로고    scopus 로고
    • Rh and Ir catalysts (asymmetric): (a) Taylor, S. J.; Duffey, M. O.; Morken, J. P. J. Am. Chem. Soc. 2000, 122, 4528-4529.
    • Rh and Ir catalysts (asymmetric): (a) Taylor, S. J.; Duffey, M. O.; Morken, J. P. J. Am. Chem. Soc. 2000, 122, 4528-4529.
  • 29
    • 0038537593 scopus 로고    scopus 로고
    • References 2a (intermolecular) and 3b (intramolecular). For hydrogen-mediated intramolecular aldol reaction between ketone and enone, see: (a) Huddleston, R. R.; Krische, M. J. Org. Lett. 2003, 5, 1143-1146.
    • References 2a (intermolecular) and 3b (intramolecular). For hydrogen-mediated intramolecular aldol reaction between ketone and enone, see: (a) Huddleston, R. R.; Krische, M. J. Org. Lett. 2003, 5, 1143-1146.
  • 33
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    • Nonasymmetric: Lam, H. W.; Murry, G. J.; Firth, J. D. Org. Lett. 2005, 7, 5743-5746.
    • Nonasymmetric: Lam, H. W.; Murry, G. J.; Firth, J. D. Org. Lett. 2005, 7, 5743-5746.
  • 40
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    • Shiomi, T.; Ito, J.; Yamamoto, Y.; Nishiyama, H. Eur. J. Org. Chem. 2006, 5594-5600. The chiral rhodium-bis(oxazolinylphenyl) catalysts, Rh(Phebox), can readily be prepared by reaction with the corresponding bis(oxazolinyl)benzenes and rhodium chloride; see:
    • (c) Shiomi, T.; Ito, J.; Yamamoto, Y.; Nishiyama, H. Eur. J. Org. Chem. 2006, 5594-5600. The chiral rhodium-bis(oxazolinylphenyl) catalysts, Rh(Phebox), can readily be prepared by reaction with the corresponding bis(oxazolinyl)benzenes and rhodium chloride; see:
  • 42
    • 34248364720 scopus 로고    scopus 로고
    • Typical procedure: Table 1, entry 7: the rhodium complex, Rh-(Phebox-ip)(OAc)2(H2O, 5.4 mg, 0.01 mmol, was placed in a 10 mL flask. Under an argon atmosphere, ethyl cinnamate (176 mg, 1.0 mmol) and acetone (0.20 mL) were added. Methyldiphenylsilane (258 mg, 1.3 mmol) was slowly added at 50°C by syringe, and the mixture was stirred for 0.5 h. The reaction was monitored by TLC examination; Rf ca. 0.8 for the silyl ether of the aldol product (eluent: EtOAc/hexane, 1:2, To the mixture was added EtOH (1 mL) and aq HCl (1 mL, 4 N) at 0°C, then the mixture was stirred at room temperature for 4 h; TLC, Rf ca. 0.4 for the aldol product 2 (eluent: EtOAc/hexane, 1:2, The mixture was treated with aq NaHCO3 (ca. 15 mL) and extracted with EtOAc (3 × 5 mL, The combined organic layer was washed with saturated brine 5 mL, then dried over Na2SO4. After concentration, the residue was purified by silica gel
    • 3). Chromatography: DAICEL CHIRALPAK AS-H; eluent: hexane/2-propanol (99:1) (0.5 mL/min); retention time: 22.3 min (minor), 26.3 min (major); 97% ee. Determination of absolute configuration, see the Supporting Information.


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