Polyfunctional Imidazolium Aryloxide Betaine/Lewis Acid Catalysts as Tools for the Asymmetric Synthesis of Disfavored Diastereomers.
Willig, Felix; Lang, Johannes; Hans, Andreas C.; Ringenberg, Mark R.; Pfeffer, Daniel; Frey, Wolfgang; Peters, René; Journal of the American Chemical Society 141 (2019) 12029–12043; doi:10.1021/jacs.9b04902

data_4128596
_publ_section_title
;
 Polyfunctional Imidazolium Aryloxide Betaine/Lewis Acid Catalysts as
 Tools for the Asymmetric Synthesis of Disfavored Diastereomers.
;
_journal_issue                   30
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12029
_journal_page_last               12043
_journal_paper_doi               10.1021/jacs.9b04902
_journal_volume                  141
_journal_year                    2019
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C16 H18 N2 O7'
_chemical_formula_sum            'C16 H18 N2 O7'
_chemical_formula_weight         350.32
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            12
_cell_length_a                   10.4490(4)
_cell_length_b                   19.9438(10)
_cell_length_c                   23.4389(12)
_cell_measurement_reflns_used    7967
_cell_measurement_temperature    130(2)
_cell_measurement_theta_max      66.29
_cell_measurement_theta_min      2.91
_cell_volume                     4884.5(4)
_computing_cell_refinement       'Bruker APEXII Software Suite, 2008'
_computing_data_collection       'Bruker APEXII Software Suite, 2008'
_computing_data_reduction        'Bruker APEXII Software Suite, 2008'
_computing_molecular_graphics    'SHELXTL-plus, XP (Sheldrick, 1991)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      130(2)
_diffrn_measured_fraction_theta_full 0.982
_diffrn_measured_fraction_theta_max 0.982
_diffrn_measurement_device_type  'Bruker Kappa APEXII Duo'
_diffrn_measurement_method       'Omega + Phi Scans'
_diffrn_radiation_monochromator  Triumph
_diffrn_radiation_source         I\mS
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0485
_diffrn_reflns_av_sigmaI/netI    0.0264
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            61008
_diffrn_reflns_theta_full        66.29
_diffrn_reflns_theta_max         66.29
_diffrn_reflns_theta_min         2.91
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.964
_exptl_absorpt_correction_T_max  0.8637
_exptl_absorpt_correction_T_min  0.7274
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'SADABS (Bruker, 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.429
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             2208
_exptl_crystal_size_max          0.33
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.167
_refine_diff_density_min         -0.143
_refine_diff_density_rms         0.031
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.01(8)
_refine_ls_extinction_coef       0.00063(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     680
_refine_ls_number_reflns         8377
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0279
_refine_ls_R_factor_gt           0.0256
_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^)+(0.0383P)^2^+0.4296P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0652
_refine_ls_wR_factor_ref         0.0663
_reflns_number_gt                7967
_reflns_number_total             8377
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja9b04902_si_010.cif
_cod_data_source_block           s2477lc
_cod_database_code               4128596