Development of Chiral, Bifunctional Thiosquaramides: Enantioselective Michael Additions of Barbituric Acids to Nitroalkenes.
Rombola, Michael; Sumaria, Chintan S.; Montgomery, Thomas D.; Rawal, Viresh H.; Journal of the American Chemical Society 139 (2017) 5297–5300; doi:10.1021/jacs.7b01115

data_4126159
_publ_section_title
;
 Development of Chiral, Bifunctional Thiosquaramides: Enantioselective
 Michael Additions of Barbituric Acids to Nitroalkenes.
;
_journal_issue                   15
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              5297
_journal_page_last               5300
_journal_paper_doi               10.1021/jacs.7b01115
_journal_volume                  139
_journal_year                    2017
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C25 H20 Cl N3 O5'
_chemical_formula_sum            'C25 H20 Cl N3 O5'
_chemical_formula_weight         477.89
_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
_atom_sites_solution_primary     dual
_atom_sites_solution_secondary   difmap
_audit_creation_date             2016-04-14
_audit_creation_method
;
Olex2 1.2
(compiled 2016.02.19 svn.r3266 for OlexSys, GUI svn.r5155)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.5579(3)
_cell_length_b                   13.5603(4)
_cell_length_c                   14.1952(4)
_cell_measurement_reflns_used    9900
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      74.45
_cell_measurement_theta_min      3.11
_cell_volume                     2224.79(11)
_computing_cell_refinement       'SAINT V.8.35A (Bruker AXS Inc., 2013)'
_computing_data_collection       'APEX3 v.2015.9-0 (Bruker AXS Inc., 2015)'
_computing_data_reduction        'SAINT V.8.35A (Bruker AXS Inc., 2013)'
_computing_molecular_graphics
;
OLEX2: a complete structure solution, refinement and analysis program 
Dolomanov et al., 2009

Mercury: visualization and analysis of crystal structures
Macrae, et al., 2006

O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann.
J. Appl. Cryst. (2009). 42, 339-341;

C. F. Macrae, P. R. Edgington, P. McCabe, E. Pidcock, G. P. Shields, R. Taylor,
M. Towler and J. van de Streek, J. Appl. Cryst. (2006). 39, 453-457.
;
_computing_publication_material
;
 APEX3 v.2015.5-2 (Bruker AXS Inc., 2015)
 OLEX2 (Dolomanov et al., 2009)
;
_computing_structure_refinement  'XL-2014/7 (Sheldrick, 2015b)'
_computing_structure_solution    'XT 2014/5 (Sheldrick, 2015a)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.4167
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_device_type  'Bruker D8 Venture PHOTON 100 CMOS'
_diffrn_measurement_method       'omega and phi scans'
_diffrn_radiation_monochromator  mirrors
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0228
_diffrn_reflns_av_unetI/netI     0.0308
_diffrn_reflns_Laue_measured_fraction_full 0.986
_diffrn_reflns_Laue_measured_fraction_max 0.974
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            13741
_diffrn_reflns_point_group_measured_fraction_full 0.972
_diffrn_reflns_point_group_measured_fraction_max 0.950
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         74.538
_diffrn_reflns_theta_min         4.509
_diffrn_source                   'INCOATEC ImuS micro-focus source'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.895
_exptl_absorpt_correction_T_max  0.7538
_exptl_absorpt_correction_T_min  0.5486
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2014/5 (Bruker,2014/5) was used for absorption correction.
wR2(int) was 0.1210 before and 0.0620 after correction.
The Ratio of minimum to maximum transmission is 0.7278.
The \l/2 correction factor is 0.00150.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.427
_exptl_crystal_description       block
_exptl_crystal_F_000             992
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.215
_refine_diff_density_min         -0.150
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details
;
 Flack x determined using 1744 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.024(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     308
_refine_ls_number_reflns         4320
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0235
_refine_ls_R_factor_gt           0.0230
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0360P)^2^+0.1994P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0602
_refine_ls_wR_factor_ref         0.0605
_reflns_Friedel_coverage         0.721
_reflns_Friedel_fraction_full    0.953
_reflns_Friedel_fraction_max     0.918
_reflns_number_gt                4211
_reflns_number_total             4320
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b01115_si_002.cif
_cod_data_source_block           0216_rombola_cu
_cod_database_code               4126159
_shelx_estimated_absorpt_t_max   0.805
_shelx_estimated_absorpt_t_min   0.582
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C17(H17)
2.b Secondary CH2 refined with riding coordinates:
 C18(H18A,H18B)
2.c Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C4(H4), C5(H5), C6(H6), C12(H12), C13(H13), C14(H14),
 C15(H15), C16(H16), C20(H20), C21(H21), C23(H23), C24(H24)
2.d Idealised Me refined as rotating group:
 C25(H25A,H25B,H25C)
;
_shelx_res_checksum              54406
_shelx_hkl_checksum              99252
_shelx_shelxl_version_number     2014/7
_olex2_submission_special_instructions 'No special instructions were received'