Dual Catalysis in Enantioselective Oxidopyrylium-Based [5 + 2] Cycloadditions
Noah Z. Burns; Michael R. Witten; Eric N. Jacobsen; Journal of the American Chemical Society 133 (2011) 14578–14581; doi:10.1021/ja206997e

data_4106788
_publ_section_title
;
 Dual Catalysis in Enantioselective Oxidopyrylium-Based [5 + 2]
 Cycloadditions
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              14578
_journal_page_last               14581
_journal_paper_doi               10.1021/ja206997e
_journal_volume                  133
_journal_year                    2011
_chemical_absolute_configuration ad
_chemical_formula_sum            'C17 H17 Br O3'
_chemical_formula_weight         349.22
_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           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 95.464(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.9456(3)
_cell_length_b                   6.6693(3)
_cell_length_c                   16.2697(7)
_cell_measurement_reflns_used    9822
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.6
_cell_measurement_theta_min      2.52
_cell_volume                     750.23(6)
_computing_cell_refinement       'SAINT 7.46A (Bruker-AXS, 2009)'
_computing_data_collection       'APEX2 v2009.3.0 (Bruker-AXS, 2009)'
_computing_data_reduction        'SAINT 7.46A (Bruker-AXS, 2009)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type
;
Bruker D8 goniometer with CCD area detector  
;
_diffrn_measurement_method       'omega and phi 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  0.0304
_diffrn_reflns_av_sigmaI/netI    0.0307
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            20486
_diffrn_reflns_theta_full        28.72
_diffrn_reflns_theta_max         28.72
_diffrn_reflns_theta_min         2.52
_exptl_absorpt_coefficient_mu    2.747
_exptl_absorpt_correction_T_max  0.6677
_exptl_absorpt_correction_T_min  0.5585
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.546
_exptl_crystal_description       block
_exptl_crystal_F_000             356
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.307
_refine_diff_density_min         -0.278
_refine_diff_density_rms         0.046
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.004(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.083
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     190
_refine_ls_number_reflns         3847
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.083
_refine_ls_R_factor_all          0.0214
_refine_ls_R_factor_gt           0.0195
_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^)+(0.0186P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0455
_refine_ls_wR_factor_ref         0.0460
_reflns_number_gt                3623
_reflns_number_total             3847
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja206997e_si_003.cif
_cod_data_source_block           product-brombenzoate
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               4106788