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Volumn , Issue 13, 2007, Pages 2037-2040

Synthesis of trans-3-substituted cyclohexylamines via Brønsted acid catalyzed and substrate-mediated triple organocatalytic cascade reaction

Author keywords

3 substituted cyclohexyl amine; Organocatalysis; Organocatalytic cascade reaction; Substrate co catalyzed

Indexed keywords

AMINE; BRONSTED ACID; CYCLOHEXYLAMINE DERIVATIVE; ENAMINE;

EID: 34548184965     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2007-984877     Document Type: Article
Times cited : (20)

References (50)
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    • For chiral amine-catalyzed conjugate reductions of α,β- unsaturated carbonyl compounds, see: a
    • For chiral amine-catalyzed conjugate reductions of α,β- unsaturated carbonyl compounds, see: (a) Yang, J. W.; Hechavarria Fonseca, M. T.; List, B. Angew. Chem. Int. Ed. 2004, 43, 6660.
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    • For the reduction of quinolines, benzoxazines, benzothiazines, and benzoxazinones, see: e
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    • For a review on amine-catalyzed aldol reactions, see: List, B. In Modern Aldol Reactions, Vol. 1; Mahrwald, R., Ed.; Wiley-VCH: Weinhein Germany, 2004, 161-200.
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    • For a recent nonasymmetric amine mediated aldol condensation, Pd-catalyzed hydrogenation-reductive amination cascade in the synthesis of Fenpropimorph, see
    • For a recent nonasymmetric amine mediated aldol condensation, Pd-catalyzed hydrogenation-reductive amination cascade in the synthesis of Fenpropimorph, see: Forsyth, S. A.; Gunaratne, H. Q. N.; Hardacre, C.; McKeown, A.; Rooney, D. W. Org. Process Res. Dev. 2006, 10, 94.
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    • For the determination of the relative configuration and a highly enantioselective synthesis of the corresponding cis-products, see: Zhou, J, List, B. J. Am. Chem. Soc. 2007, 129, 7498
    • For the determination of the relative configuration and a highly enantioselective synthesis of the corresponding cis-products, see: Zhou, J.; List, B. J. Am. Chem. Soc. 2007, 129, 7498.
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    • Typical Procedure: To a Schlenk tube was added 2,6-dione 1 (0.2 mmol, p-ethoxyphenyl amine 2 (0.3 mmol, Hantzsch ester 3 (0.45 mmol) and PTSA·H2O (2 mg, 0.01 mmol, and then charged with argon, followed by adding MS 5 Å (50 mg) and anhyd toluene (0.5 mL, The mixture was stirred at 40°C for 24-72 h. To determine the ratio of trans- to cis-product, 20 μL of the reaction mixture was taken for GC-MS analysis, or 0.2 mL of crude mixture for 1H NMR analysis. The sample for analysis and the rest were emerged together for column chromatography purification using hexane-EtOAc (96:4) or CH2CT 2 as eluent. Compound trans-4a was obtained as colorless liquid (0.144 mmol, 72, after chromatography with hexane-EtOAc (96:4, 1H NMR (300 MHz, CDCl3, δ, 0.91 (d, J, 6.4 Hz, 3 H, 0.99-1.10 (m, 1 H, 1.27-1.37 (m, 1 H, 1.36 t, J, 6.9 Hz
    • +: 234.1852; found: 234.1852.
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    • This is in contrast to the corresponding NaOH-catalyzed cyclization of 2,6-heptanediones, see: Danishefsky, S, Zimmer, A. J. Org. Chem. 1976, 41, 4059
    • This is in contrast to the corresponding NaOH-catalyzed cyclization of 2,6-heptanediones, see: Danishefsky, S.; Zimmer, A. J. Org. Chem. 1976, 41, 4059.
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    • Based on a SciFinder survey, there are more than 300 patented structures containing a 3-methylcyclohexylamine moiety. For selected pharmaceutically active compounds incorporating a 3-substituted cyclohexylamine, see: (a) Johnston, T. P.; McCaleb, G. S.; Clayton, S. D.; Frye, J. L.; Krauth, C. A.; Montgomery, J. A. J. Med. Chem. 1977, 20, 279.
    • Based on a SciFinder survey, there are more than 300 patented structures containing a 3-methylcyclohexylamine moiety. For selected pharmaceutically active compounds incorporating a 3-substituted cyclohexylamine, see: (a) Johnston, T. P.; McCaleb, G. S.; Clayton, S. D.; Frye, J. L.; Krauth, C. A.; Montgomery, J. A. J. Med. Chem. 1977, 20, 279.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.