Enantioselective Michael Addition of Photogenerated o-Quinodimethanes to Enones Catalyzed by Chiral Amino Acid Esters.
Yuan, Xiaoqian; Dong, Shupeng; Liu, Zhen; Wu, Guibing; Zou, Chuncheng; Ye, Jinxing; Organic letters 19 (2017) 2322–2325; doi:10.1021/acs.orglett.7b00862

data_1546223
_publ_section_title
;
 Enantioselective Michael Addition of Photogenerated o-Quinodimethanes to
 Enones Catalyzed by Chiral Amino Acid Esters.
;
_journal_issue                   9
_journal_name_full               'Organic letters'
_journal_page_first              2322
_journal_page_last               2325
_journal_paper_doi               10.1021/acs.orglett.7b00862
_journal_volume                  19
_journal_year                    2017
_chemical_absolute_configuration ad
_chemical_formula_sum            'C26 H20 Cl2 O'
_chemical_formula_weight         419.32
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2013
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.6637(14)
_cell_length_b                   10.7733(14)
_cell_length_c                   18.111(3)
_cell_measurement_reflns_used    3297
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      46.636
_cell_measurement_theta_min      4.433
_cell_volume                     2080.7(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0419
_diffrn_reflns_av_unetI/netI     0.0419
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            12005
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.498
_diffrn_reflns_theta_min         2.200
_exptl_absorpt_coefficient_mu    0.327
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6417
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.339
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             872
_exptl_crystal_size_max          0.220
_exptl_crystal_size_mid          0.170
_exptl_crystal_size_min          0.130
_refine_diff_density_max         0.238
_refine_diff_density_min         -0.190
_refine_diff_density_rms         0.042
_refine_ls_abs_structure_details
; 
 Flack x determined using 1292 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons and Flack (2004), Acta Cryst. A60, s61). 
;
_refine_ls_abs_structure_Flack   0.06(3)
_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     262
_refine_ls_number_reflns         3867
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0497
_refine_ls_R_factor_gt           0.0417
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0608P)^2^+0.0220P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0998
_refine_ls_wR_factor_ref         0.1047
_reflns_Friedel_coverage         0.751
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                3347
_reflns_number_total             3867
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol7b00862_si_002.cif
_cod_data_source_block           cd16552
_cod_database_code               1546223
_shelx_estimated_absorpt_t_min   0.932
_shelx_estimated_absorpt_t_max   0.959
_shelxl_version_number           2013-4
_shelx_res_checksum              1427
_shelx_hkl_checksum              81907