Stereoselective formation of chiral trans-4-hydroxy-5-substituted 2-pyrrolidinones: syntheses of streptopyrrolidine and 3-epi-epohelmin A
Si, Chang-Mei; Mao, Zhuo-Ya; Liu, Yi-Wen; Du, Zhen-Ting; Wei, Bang-Guo; Lin, Guo-Qiang; Organic Chemistry Frontiers 2 (2015) 1485–; doi:10.1039/C5QO00250H

data_1553183
_publ_section_title
;
 Stereoselective formation of chiral trans-4-hydroxy-5-substituted
 2-pyrrolidinones: syntheses of streptopyrrolidine and 3-epi-epohelmin A
;
_journal_issue                   11
_journal_name_full               'Organic Chemistry Frontiers'
_journal_page_first              1485
_journal_paper_doi               10.1039/C5QO00250H
_journal_volume                  2
_journal_year                    2015
_chemical_absolute_configuration rm
_chemical_formula_sum            'C21 H33 N O4 Si'
_chemical_formula_weight         391.57
_chemical_name_systematic        scm5-1986
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_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
_audit_update_record
;
2015-08-06 deposited with the CCDC.
2015-09-06 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.3258(2)
_cell_length_b                   17.6205(6)
_cell_length_c                   20.9213(7)
_cell_measurement_reflns_used    4499
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      18.90
_cell_measurement_theta_min      2.26
_cell_volume                     2331.97(13)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_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      296(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_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  0.0460
_diffrn_reflns_av_sigmaI/netI    0.0497
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            30738
_diffrn_reflns_theta_full        28.31
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.51
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.124
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.6753
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.115
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             848
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.484
_refine_diff_density_min         -0.280
_refine_diff_density_rms         0.112
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.17(16)
_refine_ls_extinction_coef       0.024(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.933
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     253
_refine_ls_number_reflns         5715
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.933
_refine_ls_R_factor_all          0.1041
_refine_ls_R_factor_gt           0.0518
_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^)+(0.0928P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1285
_refine_ls_wR_factor_ref         0.1503
_reflns_number_gt                3222
_reflns_number_total             5715
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c5qo00250h2.cif
_cod_data_source_block           20150603scm_0m
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Orthorhombic' was changed
to 'orthorhombic' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/RSC/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1553183