Chemoselective synthesis of 5,4'-imidazolinyl spirobarbiturates <i>via</i> NBS-promoted cyclization of unsaturated barbiturates and amidines.
Xu, Hui; Huang, Rong-Lu; Shu, Zhu; Hong, Ran; Zhang, Ze; Organic & biomolecular chemistry 19 (2021) 4978–4985; doi:10.1039/d1ob00508a

data_7158076
_publ_section_title
;
 Chemoselective synthesis of 5,4'-imidazolinyl spirobarbiturates
 <i>via</i> NBS-promoted cyclization of unsaturated barbiturates and
 amidines.
;
_journal_issue                   22
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              4978
_journal_page_last               4985
_journal_paper_doi               10.1039/d1ob00508a
_journal_volume                  19
_journal_year                    2021
_chemical_formula_moiety         'C27 H23 Br N4 O3'
_chemical_formula_sum            'C27 H23 Br N4 O3'
_chemical_formula_weight         531.40
_space_group_crystal_system      orthorhombic
_space_group_IT_number           61
_space_group_name_Hall           '-P 2ac 2ab'
_space_group_name_H-M_alt        'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2020-01-14
_audit_creation_method
;
Olex2 1.3
(compiled Nov 21 2019 18:26:39 for OlexSys, GUI svn.r6003)
;
_audit_update_record
;
2020-02-08 deposited with the CCDC.	2021-05-10 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   8.3195(3)
_cell_length_b                   18.8155(8)
_cell_length_c                   30.0395(15)
_cell_measurement_reflns_used    9949
_cell_measurement_temperature    173
_cell_measurement_theta_max      27.445
_cell_measurement_theta_min      2.554
_cell_volume                     4702.2(4)
_computing_cell_refinement       'SAINT v8.37A (Bruker, 2015)'
_computing_data_reduction        'SAINT v8.37A (Bruker, 2015)'
_computing_molecular_graphics    'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2018/3 (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      173
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0491
_diffrn_reflns_av_unetI/netI     0.0363
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -38
_diffrn_reflns_number            30027
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.484
_diffrn_reflns_theta_min         2.269
_diffrn_source_current           40.0
_diffrn_source_power             2.0
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.787
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.4186
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2014/5 (Bruker,2014/5) was used for absorption correction.
wR2(int) was 0.1001 before and 0.0505 after correction.
The Ratio of minimum to maximum transmission is 0.5614.
The \l/2 correction factor is 0.00150.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.501
_exptl_crystal_description       block
_exptl_crystal_F_000             2176
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.435
_refine_diff_density_min         -0.524
_refine_diff_density_rms         0.057
_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     318
_refine_ls_number_reflns         5385
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0436
_refine_ls_R_factor_gt           0.0324
_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^)+(0.0303P)^2^+3.1381P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0745
_refine_ls_wR_factor_ref         0.0796
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4439
_reflns_number_total             5385
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d1ob00508a2.cif
_cod_data_source_block           a
_cod_depositor_comments          'Adding full bibliography for 7158076.cif.'
_cod_database_code               7158076
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.842
_shelx_estimated_absorpt_t_min   0.775
_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:
 C15(H15)
2.b Secondary CH2 refined with riding coordinates:
 C7(H7A,H7B)
2.c Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C5(H5), C6(H6), C8(H8), C9(H9), C11(H11), C12(H12),
 C13(H13), C18(H18), C19(H19), C20(H20), C21(H21)
2.d Idealised Me refined as rotating group:
 C26(H26A,H26B,H26C), C27(H27A,H27B,H27C)
;
_shelx_res_checksum              63204
_olex2_submission_special_instructions 'No special instructions were received'