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Volumn , Issue 15, 2007, Pages 2448-2450

Enantioselective cyanoformylation of aldehydes catalyzed by a chiral quaternary ammonium salt and triethylamine

Author keywords

Aldehyde; Cyanation; Ethyl cyanoformate; Organocatalysis; Quaternary ammonium salt

Indexed keywords

ALDEHYDE; AMMONIUM DERIVATIVE; TRIETHYLAMINE;

EID: 34948878544     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2007-986625     Document Type: Article
Times cited : (33)

References (48)
  • 1
    • 19644385319 scopus 로고    scopus 로고
    • For reviews on the synthesis and applications of cyanohydrins, see: a, Murahashi, S. I, Ed, Thieme: Stuttgart
    • For reviews on the synthesis and applications of cyanohydrins, see: (a) North, M. Science of Synthesis, Vol. 19; Murahashi, S. I., Ed.; Thieme: Stuttgart, 2004, 235-284.
    • (2004) Science of Synthesis , vol.19 , pp. 235-284
    • North, M.1
  • 6
    • 0001678717 scopus 로고    scopus 로고
    • Cyanation of Carbonyl and Amino Groups
    • Jacobsen, E. N, Pfaltz, A, Yamamoto, H, Eds, Springer-Verlag: Heidelberg
    • (f) Mori, A.; Inoue, S. Cyanation of Carbonyl and Amino Groups, In Comprehensive Asymmetric Synthesis; Jacobsen, E. N.; Pfaltz, A.; Yamamoto, H., Eds.; Springer-Verlag: Heidelberg, 1999, 983-992.
    • (1999) Comprehensive Asymmetric Synthesis , pp. 983-992
    • Mori, A.1    Inoue, S.2
  • 8
    • 33746233274 scopus 로고    scopus 로고
    • For recent reviews on cyanation reactions, see: a
    • For recent reviews on cyanation reactions, see: (a) Chen, F. X.; Feng, X. M. Curr. Org. Synth. 2006, 3, 77.
    • (2006) Curr. Org. Synth , vol.3 , pp. 77
    • Chen, F.X.1    Feng, X.M.2
  • 38
    • 0348225177 scopus 로고    scopus 로고
    • For a chemoenzymatic one-pot reaction of ethyl cyanoformate with benzaldehyde catalyzed by hydroxynitrile lyase, see: Purkarthofer, T, Skranc, W, Weber, H, Griengl, H, Wubbolts, M, Scholz, G, Pöchlauer, P. Tetrahedron 2004, 60, 735
    • For a chemoenzymatic one-pot reaction of ethyl cyanoformate with benzaldehyde catalyzed by hydroxynitrile lyase, see: Purkarthofer, T.; Skranc, W.; Weber, H.; Griengl, H.; Wubbolts, M.; Scholz, G.; Pöchlauer, P. Tetrahedron 2004, 60, 735.
  • 40
    • 34948897823 scopus 로고    scopus 로고
    • Procedure for Preparation of 2h: To a solution of 2g (0.100 g, 0.158 mmol) in CH2Cl2 (10 mL) at r.t. was added MeCOOAg (0.0277 g, 0.166 mmol, 1.05 equiv, and the mixture was stirred in the dark at r.t. for one week. The residue was centrifuged for half an hour. Then the precipitate was filtered off and the filtrate was concentrated under reduced pressure to afford a yellow solid; mp 142-143°C; [α]D 25 121 (c, 0.108, CHCl3, IR (KBr, 3411, 2931, 2361, 1622, 1509, 1374, 1280, 1178, 1136, 905, 683 cm-1. 1H NMR (300 MHz, CDCl3, δ, 8.57 (d, J, 4.5 Hz, 1 H, 8.02 (s, 1 H, 7.66-7.81 (m, 4 H, 7.24-7.25 (m, 1 H, 6.94-6.98 (dd, J, 2.3, 9.2 Hz, 1 H, 6.49 (d, J, 12.5 Hz, 1 H, 6.37 (s, 1 H, 5.82-5.94 (sept, 1 H, 5.41 (d, J, 13.1 Hz, 1 H, 5.17-5.25 (m, 1 H, 4.70 (t, J, 10.5 Hz, 1 H, 4.52 t, J, 10.1 Hz, 1 H, 4.15
    • 2: 551.2128; found: 551.2020.
  • 42
    • 34948897314 scopus 로고    scopus 로고
    • Typical Procedure: To a mixture of benzaldehyde (0.1 mmol, quaternary ammonium salt 2h (0.01 mmol, 10 mol, and Et3N (0.01 mmol) in CH2Cl2 (2 mL) under a N2 atmosphere, was added ethyl cyanoformate (0.15 mmol, 1.5 equiv) at -78°C. The reaction was monitored by TLC, and after the reaction time indicated in Table 3, the residue was directly purified by silica gel column chromatography (PE-Et2O, 10:1) to afford the title compound as a colorless oil in 96% yield with 67% ee as determined by HPLC analysis with a Chiralcel OD-H column [λ, 254 nm, hexane-2-propanol, 99:1, 1.0 mL/min, t R(major, 9.2 min, tR(minor, 10.9 min, α]D25, 6.49 (c, 0.154, CHCl3, 1H NMR (300 MHz, CDCl3, δ, 7.53-7.56 (m, 2 H, ArH, 745-7.49 (m, 3 H, ArH, 6.27 (s, 1 H, OCHCN, 4.26-4.32 m, 2 H, OCH 2, 1.34
    • 3).
  • 43
    • 34948838695 scopus 로고    scopus 로고
    • Only 50% ee was obtained for the corresponding product of cyclohexanal and isopropanal
    • Only 50% ee was obtained for the corresponding product of cyclohexanal and isopropanal.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.