Enantioselective and Structure-Selective Diels-Alder Reactions of Unsymmetrical Quinones Catalyzed by a Chiral Oxazaborolidinium Cation. Predictive Selection Rules
Do Hyun Ryu; Gang Zhou; E. J. Corey; Journal of the American Chemical Society 126 (2004) 4800–4802; doi:10.1021/ja049323b

data_4112465
_publ_section_title
;
 Enantioselective and Structure-Selective Diels-Alder Reactions of
 Unsymmetrical Quinones Catalyzed by a Chiral Oxazaborolidinium Cation.
 Predictive Selection Rules
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              4800
_journal_page_last               4802
_journal_paper_doi               10.1021/ja049323b
_journal_volume                  126
_journal_year                    2004
_chemical_formula_moiety         'C22H19O4Br * 1/2(C6H6)'
_chemical_formula_sum            'C25 H22 Br O4'
_chemical_formula_weight         466.34
_space_group_IT_number           1
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  'P 1'
_symmetry_space_group_name_H-M   'P 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                86.474(5)
_cell_angle_beta                 85.994(5)
_cell_angle_gamma                86.697(5)
_cell_formula_units_Z            2
_cell_length_a                   9.023(3)
_cell_length_b                   9.848(3)
_cell_length_c                   12.297(4)
_cell_measurement_temperature    213(2)
_cell_volume                     1086.4(6)
_computing_cell_refinement       'SMART (BRUKER, V5.625, 2001)'
_computing_data_collection       'ASTRO (BRUKER, V5.007, 1997)'
_computing_data_reduction        'SAINT (BRUKER, V6.22, 2001)'
_computing_molecular_graphics    'SHELXTL (BRUKER, 2000, V6.1)'
_computing_publication_material  'XCIF (Sheldrick and BRUKER, 1997, V5.1)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      213(2)
_diffrn_detector_area_resol_mean 836.6
_diffrn_measured_fraction_theta_full 0.937
_diffrn_measured_fraction_theta_max 0.937
_diffrn_measurement_device_type  'Bruker CCD'
_diffrn_measurement_method       '\w, 0.3 deg'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0556
_diffrn_reflns_av_sigmaI/netI    0.0664
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            6890
_diffrn_reflns_theta_full        27.90
_diffrn_reflns_theta_max         27.90
_diffrn_reflns_theta_min         1.66
_diffrn_standards_decay_%        <1
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.920
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.426
_exptl_crystal_density_meas      0
_exptl_crystal_description       chunk
_exptl_crystal_F_000             478
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.523
_refine_diff_density_min         -0.598
_refine_diff_density_rms         0.072
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.011(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.036
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     543
_refine_ls_number_reflns         5710
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0954
_refine_ls_R_factor_gt           0.0515
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0646P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1071
_refine_ls_wR_factor_ref         0.1240
_reflns_number_gt                3778
_reflns_number_total             5710
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja049323bsi20040206_050236.cif
_cod_data_source_block           ejc65t
_cod_original_cell_volume        1086.3(6)
_cod_database_code               4112465