Thiolation of symmetrical and unsymmetrical diketopiperazines.
Ruff, Bettina M.; Zhong, Sabilla; Nieger, Martin; Bräse, Stefan; Organic & biomolecular chemistry 10 (2012) 935–940; doi:10.1039/c2ob06663g

data_7152213
_publ_section_title
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 Thiolation of symmetrical and unsymmetrical diketopiperazines.
;
_journal_issue                   5
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              935
_journal_page_last               940
_journal_paper_doi               10.1039/c2ob06663g
_journal_volume                  10
_journal_year                    2012
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C18 H24 N2 O2 S2'
_chemical_formula_sum            'C18 H24 N2 O2 S2'
_chemical_formula_weight         364.51
_chemical_name_systematic
;
dodecahydro-6a,13a-epidithiopyrazino[1,2-a:4,5-a']diindole-6,13(1H,7H)-dione
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_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     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            4
_cell_length_a                   6.4416(6)
_cell_length_b                   10.8045(5)
_cell_length_c                   24.627(2)
_cell_measurement_reflns_used    214
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      25.0
_cell_measurement_theta_min      2.5
_cell_volume                     1714.0(2)
_computing_cell_refinement       EVALCCD
_computing_data_collection       Collect
_computing_data_reduction        EVALCCD
_computing_molecular_graphics    XP
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker-Nonius KappaCCD'
_diffrn_measurement_method       'rotation in phi, 1 deg.'
_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  0.0354
_diffrn_reflns_av_sigmaI/netI    0.0403
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            12711
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.12
_exptl_absorpt_coefficient_mu    0.324
_exptl_absorpt_correction_T_max  0.9803
_exptl_absorpt_correction_T_min  0.8165
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.413
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plates
_exptl_crystal_F_000             776
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.253
_refine_diff_density_min         -0.199
_refine_diff_density_rms         0.047
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.07(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.070
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         3924
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.070
_refine_ls_R_factor_all          0.0454
_refine_ls_R_factor_gt           0.0353
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0289P)^2^+0.5072P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0712
_refine_ls_wR_factor_ref         0.0745
_reflns_number_gt                3471
_reflns_number_total             3924
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ob06663g.txt
_cod_data_source_block           sb343_hy
_cod_depositor_comments
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The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'none' was changed to '?' - the
value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
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_cod_database_code               7152213