Diastereoselective synthesis of benzo[d]chromeno[3′,4′:3,4]pyrrolo[2,1-b]thiazoles via cycloaddition reaction of benzothiazolium salts with 3-nitrochromenes
Jiang, Wang; Sun, Jing; Yan, Chao-Guo; RSC Adv. 7 (2017) 42387–; doi:10.1039/C7RA06548E

data_7229043
_publ_section_title
;
 Diastereoselective synthesis of
 benzo[d]chromeno[3&#x2032;,4&#x2032;:3,4]pyrrolo[2,1-b]thiazoles via
 cycloaddition reaction of benzothiazolium salts with 3-nitrochromenes
;
_journal_issue                   67
_journal_name_full               'RSC Adv.'
_journal_page_first              42387
_journal_paper_doi               10.1039/C7RA06548E
_journal_volume                  7
_journal_year                    2017
_chemical_formula_moiety         'C31 H23 Br N2 O5 S'
_chemical_formula_sum            'C31 H23 Br N2 O5 S'
_chemical_formula_weight         615.48
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2017-05-03 deposited with the CCDC.
2017-08-28 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 120.576(5)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   16.7535(18)
_cell_length_b                   7.6164(8)
_cell_length_c                   24.6930(19)
_cell_measurement_reflns_used    9901
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      26.73
_cell_measurement_theta_min      2.48
_cell_volume                     2712.7(5)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0301
_diffrn_reflns_av_unetI/netI     0.0330
_diffrn_reflns_Laue_measured_fraction_full 0.993
_diffrn_reflns_Laue_measured_fraction_max 0.992
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            26050
_diffrn_reflns_point_group_measured_fraction_full 0.993
_diffrn_reflns_point_group_measured_fraction_max 0.992
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.529
_diffrn_reflns_theta_min         2.478
_exptl_absorpt_coefficient_mu    1.637
_exptl_absorpt_correction_T_max  0.675
_exptl_absorpt_correction_T_min  0.639
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.507
_exptl_crystal_description       block
_exptl_crystal_F_000             1256
_exptl_crystal_size_max          0.280
_exptl_crystal_size_mid          0.240
_exptl_crystal_size_min          0.240
_refine_diff_density_max         0.484
_refine_diff_density_min         -0.528
_refine_diff_density_rms         0.048
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     362
_refine_ls_number_reflns         6183
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          0.0737
_refine_ls_R_factor_gt           0.0394
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0521P)^2^+0.6214P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0970
_refine_ls_wR_factor_ref         0.1093
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4066
_reflns_number_total             6183
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7ra06548e2.cif
_cod_data_source_block           3n
_cod_database_code               7229043
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.657
_shelx_estimated_absorpt_t_max   0.695
_shelx_res_checksum              38559