A new short synthesis route for favipiravir and its analogue: Their tautomerization behaviour
Ghosh, Priyanka; Panda, Subhra Jyoti; Purohit, Chandra Shekhar; New Journal of Chemistry 46 (2022) 18824–18831; doi:10.1039/D2NJ02996K

data_7061911
_publ_section_title
;
 A new short synthesis route for favipiravir and its analogue: Their
 tautomerization behaviour
;
_journal_issue                   39
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              18824
_journal_page_last               18831
_journal_paper_doi               10.1039/D2NJ02996K
_journal_volume                  46
_journal_year                    2022
_chemical_formula_moiety         'C7 H7 Br N2 O3'
_chemical_formula_sum            'C7 H7 Br N2 O3'
_chemical_formula_weight         247.06
_space_group_crystal_system      tetragonal
_space_group_IT_number           86
_space_group_name_Hall           '-P 4bc'
_space_group_name_H-M_alt        'P 42/n :2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2022-02-28
_audit_creation_method
;
Olex2 1.3
(compiled 2020.11.12 svn.r5f609507 for OlexSys, GUI svn.r6408)
;
_audit_update_record
;
2022-02-28 deposited with the CCDC.	2022-09-21 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   18.4161(7)
_cell_length_b                   18.4161(7)
_cell_length_c                   5.5450(2)
_cell_measurement_reflns_used    3123
_cell_measurement_temperature    298.8(5)
_cell_measurement_theta_max      70.2460
_cell_measurement_theta_min      4.7790
_cell_volume                     1880.60(12)
_computing_cell_refinement       'CrysAlisPro 1.171.40.84a (Rigaku OD, 2020)'
_computing_data_collection       'CrysAlisPro 1.171.40.84a (Rigaku OD, 2020)'
_computing_data_reduction        'CrysAlisPro 1.171.40.84a (Rigaku OD, 2020)'
_computing_molecular_graphics    'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2018/3 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_environment      air
_diffrn_ambient_temperature      298.8(5)
_diffrn_detector                 'Hybrid Pixel Array Detector'
_diffrn_detector_area_resol_mean 5.8140
_diffrn_detector_type            'Pilatus 200K'
_diffrn_measured_fraction_theta_full 0.9989
_diffrn_measured_fraction_theta_max 0.9842
_diffrn_measurement_details
;
List of Runs (angles in degrees, time in seconds):

  # Type    Start    End  Width  t~exp~   \w     \q     \k     \f   Frames
  1  \w    -70.00  23.00   0.50    1.60    --  -38.50  92.00 120.00  186
  2  \w     33.00 106.00   0.50    6.00    --  102.63 -92.00   7.00  146
  3  \w    104.00 171.00   0.50    6.00    --  102.63  92.00 120.00  134
  4  \w   -105.00 -35.00   0.50    1.60    --  -38.50 -38.00 -90.00  140
  5  \w     -1.00  82.00   0.50    1.60    --   49.56 -92.00   7.00  166
  6  \w     35.00 106.00   0.50    6.00    --  102.63 -30.00  30.00  142
  7  \w     98.00 167.00   0.50    6.00    --  102.63  45.00 -90.00  138
  8  \w     98.00 167.00   0.50    6.00    --  102.63  45.00  30.00  138
  9  \w     98.00 167.00   0.50    6.00    --  102.63  45.00-120.00  138
 10  \w     38.00  69.00   0.50    1.60    --   49.56  57.00 150.00   62
;
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type
'SuperNova, Dual, Cu at home/near, Pilatus 200K'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_type
'CrysAlisPro convention (1999,Acta A55,543-557)'
_diffrn_orient_matrix_UB_11      0.0322036000
_diffrn_orient_matrix_UB_12      0.0652532000
_diffrn_orient_matrix_UB_13      -0.1369119000
_diffrn_orient_matrix_UB_21      0.0696406000
_diffrn_orient_matrix_UB_22      -0.0438533000
_diffrn_orient_matrix_UB_23      -0.0494418000
_diffrn_orient_matrix_UB_31      -0.0333888000
_diffrn_orient_matrix_UB_32      -0.0286355000
_diffrn_orient_matrix_UB_33      -0.2364775000
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0407
_diffrn_reflns_av_unetI/netI     0.0327
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.982
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            7767
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.982
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         75.343
_diffrn_reflns_theta_min         4.803
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'SuperNova (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    5.824
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.46812
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.40.84a (Rigaku Oxford Diffraction, 2020)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'clear light colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.745
_exptl_crystal_description       needle
_exptl_crystal_F_000             976
_exptl_crystal_preparation       'As per the reaction scheme'
_exptl_crystal_recrystallization_method 'Slow evaporation'
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.467
_refine_diff_density_min         -0.482
_refine_diff_density_rms         0.052
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     120
_refine_ls_number_reflns         1908
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.0570
_refine_ls_R_factor_gt           0.0416
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0371P)^2^+1.3940P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0992
_refine_ls_wR_factor_ref         0.1075
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1432
_reflns_number_total             1908
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d2nj02996k2.cif
_cod_data_source_block           4a
_cod_depositor_comments
'Adding full bibliography for 7061906--7061913.cif.'
_cod_original_cell_volume        1880.60(16)
_cod_original_sg_symbol_H-M      'P 42/n'
_cod_database_code               7061911
_shelx_shelxl_version_number     2018/3
_chemical_oxdiff_formula         'C56 H64 Br8 N16 O24 '
_shelx_estimated_absorpt_t_max   0.475
_shelx_estimated_absorpt_t_min   0.302
_diffrn_oxdiff_digest_frames
;
01fbe7884a3624b965386b90a9d884716c00034a2a5
;
_diffrn_oxdiff_digest_hkl
;
01349174fa67c1d03b7b82d250c7ed79b19e1e
;
_reflns_odcompleteness_completeness 99.89
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     66.97
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups, All O(H) groups
2.a Secondary CH2 refined with riding coordinates:
 C6(H6A,H6B)
2.b Aromatic/amide H refined with riding coordinates:
 C4(H4)
2.c Idealised Me refined as rotating group:
 C7(H7A,H7B,H7C)
2.d Idealised tetrahedral OH refined as rotating group:
 O1(H1)
;
_shelx_res_checksum              51830
_olex2_exptl_crystal_mounting_method 'Mounted on the loop'
_olex2_submission_special_instructions 'No special instructions were received'
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_oxdiff_exptl_absorpt_empirical_full_max 1.609
_oxdiff_exptl_absorpt_empirical_full_min 0.624