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Volumn , Issue 19, 2007, Pages 3179-3190

Enantioselective γ-deprotonation of alkyl-substituted O-1,3-butadien-2-yl carbamates and regioselective asymmetric homoaldol reaction

Author keywords

( ) Sparteine; Asymmetric synthesis; Carbanions; Cross coupling; Homoaldol reaction

Indexed keywords


EID: 34447304399     PISSN: 1434193X     EISSN: 10990690     Source Type: Journal    
DOI: 10.1002/ejoc.200700131     Document Type: Article
Times cited : (8)

References (56)
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    • X-ray crystal structure analysis for 21c: formula C 18H33NO3, M, 311.45, colorless crystal 0.35 X 0.30 X 0.25 mm, a, 9.378(1, b, 11.460(1, c, 18.439(1) Å, V, 1981.7(3) Å3, ρcalc, 1.044 g cm-3, μ, 0.550 mm-1, empirical absorption correction (0.831 ≤ T ≤ 0.875, Z, 4, orthorhombic, space group P212121 (No. 19, λ, 1.54178 Å, T, 223 K, ω and φ scans, 9108 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.60 Å-1, 3287 independent (Rint, 0.030) and 3210 observed reflections [I ≥ 2σ(I, 208 refined parameters, R, 0.032, wR 2, 0.087, Flack parameter -0.1(2, max. residual electron density 0.11, 0.11) e Å-3
    • -3, hydrogen atoms calculated and refined as riding atoms.
  • 40
    • 34447322955 scopus 로고    scopus 로고
    • Data sets were collected with Nonius KappaCCD diffractometers, in case of Mo-radiation equipped with a rotating anode generator. Programs used: COLLECT (Nonius B. V., 1998) for data collection, Denzo-SMN (Z. Otwinowski, W. Minor, Methods Enzymol. 1997, 276, 307-326)
    • Data sets were collected with Nonius KappaCCD diffractometers, in case of Mo-radiation equipped with a rotating anode generator. Programs used: COLLECT (Nonius B. V., 1998) for data collection, Denzo-SMN (Z. Otwinowski, W. Minor, Methods Enzymol. 1997, 276, 307-326)
  • 41
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    • for data reduction, SORTAV (R. H. Blessing, Acta Crystallogr., Sect. A 1995, 51, 33-37;
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    • and Denzo (Z. Otwinowski, D. Borek, W. Majewski, W. Minor, Acta Crystallogr., Sect. A 2003, 59, 228-234)
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    • for absorption correction, SHELXS-97 (G. M. Sheldrick, Acta Crystallogr., Sect. A 1990, 46, 467-473)
    • for absorption correction, SHELXS-97 (G. M. Sheldrick, Acta Crystallogr., Sect. A 1990, 46, 467-473)
  • 45
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    • for structure solution, SHELXL-97 (G. M. Sheldrick, University of Göttingen, 1997) for structure refinement, SCHAKAL (E. Keller, University of Freiburg, 1997) for graphics. CCDC-636950 to -636953 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.
    • for structure solution, SHELXL-97 (G. M. Sheldrick, University of Göttingen, 1997) for structure refinement, SCHAKAL (E. Keller, University of Freiburg, 1997) for graphics. CCDC-636950 to -636953 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.
  • 46
    • 34447309492 scopus 로고    scopus 로고
    • X-ray crystal structure analysis for (S,S,Z)-21d: formula C22H32BrNO3, M, 438.40, colorless crystal 0.60 X 0.15 X 0.10 mm, a, 8.426(1, b, 9.016(1, c, 15.375(1) Å, β, 94.57(1, V, 1164.3(2) Å3, ρcalc, 1.250 g cm-3, μ, 2.557 mm-1, empirical absorption correction (0.309 ≤ T ≤ 0.784, Z, 2, monoclinic, space group P21 (No. 4, λ, 1.54178 Å, T, 223 K, ω and φ scans, 6367 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.58 Å-1, 2631 independent (Rint, 0.043) and 2584 observed reflections [I ≥ 2σ(I, 253 refined parameters, R, 0.042, wR 2, 0.116, Flack parameter 0.05(3, max. residual electron density 0.43, 0.37) e Å
    • -3, hydrogen atoms calculated and refined as riding atoms.
  • 50
    • 34447320945 scopus 로고    scopus 로고
    • X-ray crystal structure analysis for (S,1Z,2E, 25b: formula C23H39NO3, M, 377.55, colorless crystal 0.45 X 0.35 X 0.20 mm, a, 11.110(1, b, 11.204(1, c, 18.863(1) Å, V, 2348.0(3) Å3, ρcalc, 1.068 g cm-3, μ, 0.069 mm-1, empirical absorption correction (0.970 ≤ T ≤ 0.986, Z, 4, orthorhombic, space group P212 121 (No. 19, λ, 0.71073 Å, T, 198 K, ω and φ scans, 18301 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.67 Å-1, 5671 independent (Rint, 0.079) and 3142 observed reflections [I ≥ 2σ(I, 253 refined parameters, R, 0.075, wR2, 0.229, Flack parameter -12, max. residual electron densi
    • -3, hydrogen atoms calculated and refined as riding atoms.
  • 51
    • 34447331602 scopus 로고    scopus 로고
    • X-ray crystal structure analysis for (R,R,1Z,2E, 28c: formula C25H36BrNO3, M, 478.46, colorless crystal 0.30 X 0.15 X 0.15 mm, a, 6.522(1, b, 12.719(1, c, 15.109(1) Å, β, 97.46(1, V, 1242.7(2) Å3, ρcalc, 1.279 g cm-3, μ, 1.678 mm-1, empirical absorption correction (0.633 ≤ T ≤ 0.787, Z, 2, monoclinic, space group P2 1 (No. 4, λ, 0.71073 Å, T, 198 K, ω and φ scans, 10810 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.67 Å-1, 5368 independent (Rint, 0.061) and 3590 observed reflections [I ≥ 2σ(I, 278 refined parameters, R, 0.053, wR2, 0.113, Flack parameter 0.021, max. residual electron density 0
    • -3, hydrogen atoms calculated and refined as riding atoms.
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    • T. Krämer, Dissertation, University of Kiel, 1989.
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