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Volumn 21, Issue 15, 2010, Pages 1833-1835

Development of chiral dinitrones as modular Lewis base catalysts: Asymmetric allylation of aldehydes with allyltrichlorosilanes

Author keywords

[No Author keywords available]

Indexed keywords

ALDEHYDE; BENZALDEHYDE; CHLOROFORM; LEWIS BASE; NITRONE; SILANE;

EID: 77957578700     PISSN: 09574166     EISSN: 1362511X     Source Type: Journal    
DOI: 10.1016/j.tetasy.2010.05.048     Document Type: Article
Times cited : (18)

References (48)
  • 1
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    • For recent reviews on modular ligands or catalysts, see: Reetz, M. T. Angew. Chem., Int. Ed. 2008, 47, 2556-2588
    • (2008) Angew. Chem., Int. Ed. , vol.47 , pp. 2556-2588
    • Reetz, M.T.1
  • 15
    • 33646555477 scopus 로고    scopus 로고
    • For reviews on Lewis base catalysis, see: Orito, Y.; Nakajima, M. Synthesis 2006, 1391-1401
    • (2006) Synthesis , pp. 1391-1401
    • Orito, Y.1    Nakajima, M.2
  • 19
    • 33947231700 scopus 로고    scopus 로고
    • For reviews, see: Pellissier, H. Tetrahedron 2007, 63, 3235-3285
    • (2007) Tetrahedron , vol.63 , pp. 3235-3285
    • Pellissier, H.1
  • 21
  • 26
    • 67649976824 scopus 로고    scopus 로고
    • C2-Symmetrical bisimidazole N,N0-dioxides derived from 1,2- cyclohaxanediamine have recently been reported as Lewis base catalysts for enantioselective allylation, see: Kwiatkowski, P.; Mucha, P.; Mloston , G.; Jurczak, J. Synlett 2009, 1757-1760.
    • Synlett , vol.2009 , pp. 1757-1760
    • Kwiatkowski, P.1    Mucha, P.2    Mloston, G.3    Jurczak, J.4
  • 28
    • 85030578274 scopus 로고    scopus 로고
    • Note
    • General procedure for preparation of dinitrones: To (S,S)-N,N- dihydroxyl1-1,2-cyclohexanediamine dihydrochloride7 (0.5 mmol), dichloromethane (10 mL), NaHCO3 (252 mg, 6 equiv), and an aldehyde (1.5 mmol) were added at room temperature. The reaction mixture was refluxed for 6 h, filtered, and evaporated. The residue was purified by silica gel column chromatography (hexane/acetone or dichloromethane/EtOH) to give a dinitrone.
  • 29
    • 33751157465 scopus 로고
    • Leading references on enantioselective allylation of aldehydes with allyltrichlorosilanes catalyzed by various types of chiral Lewis bases. For chiral phosphoramides
    • Leading references on enantioselective allylation of aldehydes with allyltrichlorosilanes catalyzed by various types of chiral Lewis bases. For chiral phosphoramides, see: Denmark, S. E.; Coe D. M.; Pratt, N. E.; Griedel, B. D. J. Org. Chem. 1994, 59 6161-6163
    • (1994) J. Org. Chem. , vol.59 , pp. 6161-6163
    • Denmark, S.E.1    Coe, D.M.2    Pratt, N.E.3    Griedel, B.D.4
  • 31
    • 85030582784 scopus 로고    scopus 로고
    • For chiral pyridine N-oxides, see: Ref. 2a
    • For chiral pyridine N-oxides, see: Ref. 2a.
  • 40
    • 85030588949 scopus 로고    scopus 로고
    • For chiral phosphine oxides, see: Ref. 2c
    • For chiral phosphine oxides, see: Ref. 2c.
  • 44
    • 0033617135 scopus 로고    scopus 로고
    • DMPU and chiral urea derivatives have been used for allylation with allyltrichlorosilane, see: Chataigner, I.; Piarulli, U.; Gennari, C. Tetrahedron Lett. 1999, 40, 3633-3634.
    • (1999) Tetrahedron Lett. , vol.40 , pp. 3633-3634
    • Chataigner, I.1    Piarulli, U.2    Gennari, C.3
  • 45
    • 85030580658 scopus 로고    scopus 로고
    • HMPA has been used as an effective achiral additive for enantioselective allylation catalyzed by chiral formamides, see: Ref. 9i
    • HMPA has been used as an effective achiral additive for enantioselective allylation catalyzed by chiral formamides, see: Ref. 9i.
  • 46
    • 85030579019 scopus 로고    scopus 로고
    • Catalyst 1a (Table 3, entry 1) and 1f (entry 10) were recovered in 99% and 93%, respectively
    • Catalyst 1a (Table 3, entry 1) and 1f (entry 10) were recovered in 99% and 93%, respectively.
  • 47
    • 85030574289 scopus 로고    scopus 로고
    • Note
    • General procedure for allylation of aldehydes with allyltrichlorosilanes: to a solution of dinitrone 1f (20 mol %), an aldehyde 2 (0.4 mmol), and DMPU (1.5 equiv) in chloroform (1 mL) was added allyltrichlorosilane (1.5 equiv) under argon at room temperature. After being stirred at that temperature for 24 h, the reaction was quenched with satd aqueous NaHCO3 (10 mL), and the slurry was stirred for 1 h. The mixture was filtered through cotton wool and extracted with ethyl acetate (3- 15 mL). The combined organic layers were washed with brine (1- 30 mL), dried over MgSO4, filtered, and concentrated under vacuum. The crude product was purified by silica gel column chromatography (hexane/ ethyl acetate) to give the product The enantiomeric excess was determined by HPLC analysis.
  • 48
    • 0037073229 scopus 로고    scopus 로고
    • Low reactivity of non-conjugated aldehydes has been observed for Lewis basecatalyzed reactions with trichlorosilylated reagents. This result has been ascribed to the formation of the corresponding O-silylated chlorohydrins
    • Low reactivity of non-conjugated aldehydes has been observed for Lewis basecatalyzed reactions with trichlorosilylated reagents. This result has been ascribed to the formation of the corresponding O-silylated chlorohydrins, see: Denmark, S. E.; Wynn, T.; Beutner, G. L. J. Am. Chem. Soc. 2002, 124, 13405-13407.
    • (2002) J. Am. Chem. Soc. , vol.124 , pp. 13405-13407
    • Denmark, S.E.1    Wynn, T.2    Beutner, G.L.3


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