Synthesis of glaucogenin d, a structurally unique disecopregnane steroid with potential antiviral activity.
Gui, Jinghan; Tian, Hailong; Tian, Weisheng; Organic letters 15 (2013) 4802–4805; doi:10.1021/ol402193b

data_1512340
_publ_section_title
;
 Synthesis of glaucogenin d, a structurally unique disecopregnane steroid
 with potential antiviral activity.
;
_journal_issue                   18
_journal_name_full               'Organic letters'
_journal_page_first              4802
_journal_page_last               4805
_journal_paper_doi               10.1021/ol402193b
_journal_volume                  15
_journal_year                    2013
_chemical_absolute_configuration ad
_chemical_formula_sum            'C36 H51 N O8 Se'
_chemical_formula_weight         704.74
_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                   12.1342(7)
_cell_length_b                   12.8992(7)
_cell_length_c                   22.5938(13)
_cell_measurement_reflns_used    4814
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      44.356
_cell_measurement_theta_min      4.608
_cell_volume                     3536.4(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0490
_diffrn_reflns_av_sigmaI/netI    0.0625
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            21596
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         1.80
_exptl_absorpt_coefficient_mu    1.112
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.50877
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.324
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             1488
_exptl_crystal_size_max          0.321
_exptl_crystal_size_mid          0.224
_exptl_crystal_size_min          0.112
_refine_diff_density_max         0.429
_refine_diff_density_min         -0.245
_refine_diff_density_rms         0.064
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.008(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.013
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     447
_refine_ls_number_reflns         6931
_refine_ls_number_restraints     73
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0678
_refine_ls_R_factor_gt           0.0506
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0736P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1226
_refine_ls_wR_factor_ref         0.1318
_reflns_number_gt                5402
_reflns_number_total             6931
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol402193b_si_001.cif
_cod_data_source_block           cd21235
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1512340