Oxazaborolidinium Ion-Catalyzed Cyclopropanation of α-Substituted Acroleins: Enantioselective Synthesis of Cyclopropanes Bearing Two Chiral Quaternary Centers
Lizhu Gao; Geum-Sook Hwang; Do Hyun Ryu; Journal of the American Chemical Society 133 (2011) 20708–20711; doi:10.1021/ja209270e

data_4107245
_publ_section_title
;
 Oxazaborolidinium Ion-Catalyzed Cyclopropanation of \a-Substituted
 Acroleins: Enantioselective Synthesis of Cyclopropanes Bearing Two Chiral
 Quaternary Centers
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              20708
_journal_page_last               20711
_journal_paper_doi               10.1021/ja209270e
_journal_volume                  133
_journal_year                    2011
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C24 H27 Br O4'
_chemical_formula_sum            'C24 H27 Br O4'
_chemical_formula_weight         459.36
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXTL
_cell_angle_alpha                90.00
_cell_angle_beta                 96.472(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.1744(6)
_cell_length_b                   14.0656(13)
_cell_length_c                   13.3422(13)
_cell_measurement_reflns_used    1390
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      20.83
_cell_measurement_theta_min      2.90
_cell_volume                     1151.34(19)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1204
_diffrn_reflns_av_sigmaI/netI    0.2697
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            8654
_diffrn_reflns_theta_full        28.31
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.54
_diffrn_standards_decay_%        <2.0
_exptl_absorpt_coefficient_mu    1.811
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.325
_exptl_crystal_description       needle
_exptl_crystal_F_000             476
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.364
_refine_diff_density_min         -0.376
_refine_diff_density_rms         0.103
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.011(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.763
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     267
_refine_ls_number_reflns         4896
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.763
_refine_ls_R_factor_all          0.1934
_refine_ls_R_factor_gt           0.0556
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0620P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1059
_refine_ls_wR_factor_ref         0.1862
_reflns_number_gt                1694
_reflns_number_total             4896
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja209270e_si_002.cif
_cod_data_source_block           hksno1m
_cod_database_code               4107245