Metal-free n-Et4NBr-catalyzed radical cyclization of disulfides and alkynes leading to benzothiophenes under mild conditions
Yang, Daoshan; Yan, Kelu; Wei, Wei; Tian, Laijin; Li, Qinghe; You, Jinmao; Wang, Hua; RSC Adv.  (2014) –; doi:10.1039/C4RA08260E

data_7218086
_publ_section_title
;
 Metal-free n-Et4NBr-catalyzed radical cyclization of disulfides and
 alkynes leading to benzothiophenes under mild conditions
;
_journal_name_full               'RSC Adv.'
_journal_paper_doi               10.1039/C4RA08260E
_journal_year                    2014
_chemical_formula_moiety         'C21 H22 N2 O3 S'
_chemical_formula_sum            'C21 H22 N2 O3 S'
_chemical_formula_weight         382.47
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            8
_cell_length_a                   10.0704(16)
_cell_length_b                   16.864(3)
_cell_length_c                   22.682(4)
_cell_measurement_reflns_used    3702
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      21.99
_cell_measurement_theta_min      2.56
_cell_volume                     3852.0(11)
_computing_cell_refinement       'SAINT (Bruker, 2002)'
_computing_data_collection       'SMART (Bruker, 2002)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'ORTEP-3 for Windows (Farrugia, 1997)'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker Smart Apex DDC'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0584
_diffrn_reflns_av_sigmaI/netI    0.0390
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            28000
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         1.80
_exptl_absorpt_coefficient_mu    0.192
_exptl_absorpt_correction_T_max  0.9848
_exptl_absorpt_correction_T_min  0.9811
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker 2002)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.319
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1616
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.260
_refine_diff_density_min         -0.307
_refine_diff_density_rms         0.040
_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     244
_refine_ls_number_reflns         3789
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0680
_refine_ls_R_factor_gt           0.0436
_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^)+(0.0572P)^2^+0.6891P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1054
_refine_ls_wR_factor_ref         0.1159
_reflns_number_gt                2736
_reflns_number_total             3789
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4ra08260e2.cif
_cod_data_source_block           sad
_cod_original_sg_symbol_Hall     '-P 2ac 2bc'
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7218086