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Volumn , Issue 20, 2007, Pages 3337-3348

Asymmetric homoaldol reactions with cyclohex-2-enyl N,N- diisopropylcarbamate: Kinetic resolution, elucidation of the stereochemical course and applications in the synthesis of hexahydroisobenzofuran-4-(1H)-ones

Author keywords

Asymmetric synthesis; Homoaldol reactions; Kinetic resolution; Metallated allyl carbamates; Tetrahydrofuran synthesis

Indexed keywords


EID: 34447542845     PISSN: 1434193X     EISSN: 10990690     Source Type: Journal    
DOI: 10.1002/ejoc.200700219     Document Type: Article
Times cited : (22)

References (51)
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    • Organolithiums in Enantioselective Synthesis
    • Ed, D. M. Hodgson, Springer, Berlin
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    • Hoppe, D.1    Marr, F.2    Brüggemann, M.3
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    • Organolithiums in Enantioselective Synthesis
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    • (2003) Top. Organomet. Chem , vol.5 , pp. 139-176
    • Beak, P.1    Johnson, T.A.2    Kim, D.D.3    Lim, S.H.4
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    • Recent examples: a) D. Hoppe, M. Özlügedik, J. Kristensen, B. Wibbeling, R. Fröhlich, Eur. J. Org. Chem. 2002, 414-427;
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    • 34447564803 scopus 로고    scopus 로고
    • For kinetic resolution of open-chained carbamates by nBuLi/(-)- sparteine (9) see: a) O. Zschage, J.-R. Schwark, D. Hoppe, Angew. Chem. 1990, 102, 336-337;
    • For kinetic resolution of open-chained carbamates by nBuLi/(-)- sparteine (9) see: a) O. Zschage, J.-R. Schwark, D. Hoppe, Angew. Chem. 1990, 102, 336-337;
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    • For kinetic resolution of allyltitanium carbamates by chiral aldehydes, see: a) R. W. Hoffmann, J. Lanz, R. Metternich, G. Tarara, D. Hoppe, Angew. Chem. 1987, 99, 1196-1197;
    • (1987) Angew. Chem , vol.99 , pp. 1196-1197
    • Hoffmann, R.W.1    Lanz, J.2    Metternich, R.3    Tarara, G.4    Hoppe, D.5
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    • 34447548470 scopus 로고    scopus 로고
    • application in total synthesis: E. de Lemos, F.-H. Porée, A. Commerçon, J.-F. Betzer, A. Pancrazi, J. Ardisson, Angew. Chem. 2007, 119, 1949-1953;
    • application in total synthesis: E. de Lemos, F.-H. Porée, A. Commerçon, J.-F. Betzer, A. Pancrazi, J. Ardisson, Angew. Chem. 2007, 119, 1949-1953;
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    • 34249672439 scopus 로고    scopus 로고
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    • [10d]
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    • 34447545438 scopus 로고    scopus 로고
    • Data sets were collected with a Nonius KappaCCD diffractometer. Programs used: data collection COLLECT (Nonius B. V., 1998),
    • Data sets were collected with a Nonius KappaCCD diffractometer. Programs used: data collection COLLECT (Nonius B. V., 1998),
  • 33
    • 0031059866 scopus 로고    scopus 로고
    • data reduction Denzo-SMN (Z. Otwinowski, W. Minor, Methods in Enzymology, 1997, 276, 307-326),
    • data reduction Denzo-SMN (Z. Otwinowski, W. Minor, Methods in Enzymology, 1997, 276, 307-326),
  • 34
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    • absorption correction Denzo (Z. Otwinowski, D. Borek, W. Majewski, W. Minor, Acta Crystallogr. 2003, A59, 228-234),
    • absorption correction Denzo (Z. Otwinowski, D. Borek, W. Majewski, W. Minor, Acta Crystallogr. 2003, A59, 228-234),
  • 35
    • 84943920736 scopus 로고    scopus 로고
    • structure solution SHELXS-97 (G. M. Sheldrick, Acta Crystallogr. 1990, A46, 467-473), structure refinement SHELXL-97 (G. M. Sheldrick, University of Göttingen, 1997) , graphics SCHAKAL (E. Keller, University of Freiburg, 1997). CCDC-639293 to -639296 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data_request/cif.
    • structure solution SHELXS-97 (G. M. Sheldrick, Acta Crystallogr. 1990, A46, 467-473), structure refinement SHELXL-97 (G. M. Sheldrick, University of Göttingen, 1997) , graphics SCHAKAL (E. Keller, University of Freiburg, 1997). CCDC-639293 to -639296 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data_request/cif.
  • 36
    • 34447548469 scopus 로고    scopus 로고
    • X-ray crystal structure analysis for 12c: formula C 20H28BrNO3, M, 410.34, colorless crystal 0.10 x 0.05 x 0.03 mm, a, 7.465(1, b, 10.067(1, c, 27.851(1) Å, V, 2093.0(4) Å3, ρcalc, 1.302 g cm-3, μ, 2.810 mm-1, empirical absorption correction (0.766 ≤ T ≤ 0.921, Z, 4, orthorhombic, space group P212121 (No. 19, λ, 1.54178 Å, T, 223 K, ω and φ scans, 8000 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.60 Å-1, 3039 independent (Rint, 0.060) and 2225 observed reflections [I ≥ 2 σ(I, 231 refined parameters, R, 0.056, wR 2, 0.114, Flack parameter -0.07(4, max. residual electron density 0.32, 0.26) e·A
    • -3, hydrogen atoms calculated and refined as riding atoms.
  • 40
    • 0042229312 scopus 로고    scopus 로고
    • H,H couplings see: Y. Chai, D. A. Vicic, M. C. McIntosh, Org Lett. 2003, 5, 1039-1042.
    • H,H couplings see: Y. Chai, D. A. Vicic, M. C. McIntosh, Org Lett. 2003, 5, 1039-1042.
  • 41
    • 34447554332 scopus 로고    scopus 로고
    • X-ray crystal structure analysis for ent-22b: formula C18H23BrO2, M, 351.27, colorless crystal 0.15 x 0.03 x 0.03 mm, a, 6.5993(1, b, 31.6292(6, c, 7.7836(1) Å, β, 90.256(1)°, V, 1624.66(4) Å3, ρcalc, 1.436 g cm-3, μ, 3.457 mm-1, empirical absorption correction (0.625 ≤ T ≤ 0.903, Z, 4, monoclinic, space group P21 (No. 4, λ, 1.54178 Å, T, 223 K, ω and φ scans, 6351 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.60 Å-1, 4030 independent (Rint, 0.050) and 3832 observed reflections [I ≥ 2 σ(I, 385 refined parameters, R, 0.049, wR 2, 0.132, Flack parameter 0.03(3, max. residual electron density 0.97, 0.36) e·
    • -3, two almost identical molecules in the asymmetric unit, hydrogen atoms calculated and refined as riding atoms.
  • 42
    • 34447568104 scopus 로고    scopus 로고
    • X-ray crystal structure analysis for 22f: formula C 27H30O2, M, 386.51, colorless crystal 0.40 x 0.25 x 0.10 mm, a, 6.907(1, b, 8.946(1, c, 16.886(1) Å, β, 96.83(1)°, V, 1036.0(2) Å3, ρcalc, 1.239 g cm-3, μ, 0.590 mm-1, empirical absorption correction (0.798 ≤ T ≤ 0.943, Z, 2, monoclinic, space group P21 (No. 4, λ, 1.54178 Å, T, 223 K, ω and φ scans, 8144 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.60 Å-1, 2652 independent (Rint, 0.030) and 2622 observed reflections [I ≥ 2 σ(I, 264 refined parameters, R, 0.035, wR 2, 0.093, Flack parameter 0.0(3, max. residual electron density 0.12, 0.11) e·Å
    • -3, hydrogen atoms calculated and refined as riding atoms.
  • 43
    • 34447556571 scopus 로고    scopus 로고
    • 19] X-ray crystal structure analysis for 22g: formula C 27H30O2, M, 386.51, colorless crystal 0.20 x 0.20 x 0.15 mm, a, 6.479(1, b, 8.790(1, c, 18.784(1) Å, β, 98.24(1)°, V, 1058.7(2) Å3, ρcalcd, 1-212 g cm-3, μ, 0.577 mm-1, empirical absorption correction (0.893 ≤ T ≤ 0.918, Z, 2, monoclinic, space group P21 (No. 4, λ, 1.54178 Å, T, 223 K, ω and φ scans, 11912 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.60 Å-1, 3613 independent (Rint, 0.048) and 3226 observed reflections [I ≥ 2 σ(I, 264 refined parameters, R, 0.070, wR 2, 0.190, Flack parameter -0.4(5, max. residual electron density 0.13, 0.15) e·Å
    • -3, hydrogen atoms calculated and refined as riding atoms.
  • 48
    • 34447566838 scopus 로고    scopus 로고
    • Samples of the crystalline product had 23% ee (HPLC), the oily residue had 94% ee (HPLC).
    • Samples of the crystalline product had 23% ee (HPLC), the oily residue had 94% ee (HPLC).
  • 49
    • 34447555561 scopus 로고    scopus 로고
    • 4 by atmospheric moisture.
    • 4 by atmospheric moisture.
  • 50
    • 34447578567 scopus 로고    scopus 로고
    • In order to remove all traces of the liberated stannanes the crude products were purified two times by flash column chromatography
    • In order to remove all traces of the liberated stannanes the crude products were purified two times by flash column chromatography.
  • 51
    • 34447576354 scopus 로고    scopus 로고
    • The diastereomeric ratio was determined from the crude products by GC (HP-5).
    • The diastereomeric ratio was determined from the crude products by GC (HP-5).


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