Silver-Assisted [3 + 2] Annulation of Nitrones with Isocyanides: Synthesis of 2,3,4-Trisubstituted 1,2,4-Oxadiazolidin-5-ones.
Shen, Xuanyu; Shatskiy, Andrey; Chen, Yan; Kärkäs, Markus D; Wang, Xiang-Shan; Liu, Jian-Quan; The Journal of organic chemistry  (2020) –; doi:10.1021/acs.joc.9b03279

data_4037947
_publ_section_title
;
 Silver-Assisted [3 + 2] Annulation of Nitrones with Isocyanides:
 Synthesis of 2,3,4-Trisubstituted 1,2,4-Oxadiazolidin-5-ones.
;
_journal_name_full               'The Journal of organic chemistry'
_journal_paper_doi               10.1021/acs.joc.9b03279
_journal_year                    2020
_chemical_formula_sum            'C20 H15 Br N2 O2'
_chemical_formula_weight         395.25
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 119.03
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.9016(14)
_cell_length_b                   6.3035(5)
_cell_length_c                   17.9016(14)
_cell_measurement_reflns_used    3403
_cell_measurement_temperature    273(2)
_cell_measurement_theta_max      28.25
_cell_measurement_theta_min      2.28
_cell_volume                     1766.3(2)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_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      273(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_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  0.0381
_diffrn_reflns_av_sigmaI/netI    0.0405
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            8266
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         2.60
_exptl_absorpt_coefficient_mu    2.343
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.486
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle-like
_exptl_crystal_F_000             800
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.719
_refine_diff_density_min         -0.568
_refine_diff_density_rms         0.057
_refine_ls_extinction_coef       0.0036(7)
_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   1.052
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     227
_refine_ls_number_reflns         3113
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0470
_refine_ls_R_factor_gt           0.0364
_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^)+(0.0466P)^2^+0.5760P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0902
_refine_ls_wR_factor_ref         0.0965
_reflns_number_gt                2473
_reflns_number_total             3113
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo9b03279_si_002.cif
_cod_data_source_block           a
_cod_depositor_comments
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The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Monoclinic' was changed to
'monoclinic' in accordance with the
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/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 7556 2019-12-06 15:28:31Z antanas 
;
_cod_original_cell_volume        1766.2(2)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               4037947