Scalable synthesis of favipiravir via conventional and continuous flow chemistry
Tiyasakulchai, Thanat; Charoensetakul, Netnapa; Khamkhenshorngphanuch, Thitiphong; Thongpanchang, Chawanee; Srikun, Onsiri; Yuthavong, Yongyuth; Srimongkolpithak, Nitipol; RSC Advances 11 (2021) 38691–38693; doi:10.1039/D1RA06963B

data_7243983
_publ_section_title
;
 Scalable synthesis of favipiravir via conventional and continuous flow
 chemistry
;
_journal_issue                   61
_journal_name_full               'RSC Advances'
_journal_page_first              38691
_journal_page_last               38693
_journal_paper_doi               10.1039/D1RA06963B
_journal_volume                  11
_journal_year                    2021
_chemical_formula_moiety         'C5 H4 F N3 O2'
_chemical_formula_sum            'C5 H4 F N3 O2'
_chemical_formula_weight         157.11
_chemical_name_systematic        ETOH1
_space_group_crystal_system      orthorhombic
_space_group_IT_number           33
_space_group_name_Hall           'P 2c -2n'
_space_group_name_H-M_alt        'P n a 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_date             2020-09-23
_audit_creation_method
;
Olex2 1.3
(compiled 2020.07.31 svn.rc2a77460 for OlexSys, GUI svn.r6145)
;
_audit_update_record
;
2021-08-30 deposited with the CCDC.	2021-11-12 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.144(2)
_cell_length_b                   14.870(3)
_cell_length_c                   4.5573(10)
_cell_measurement_reflns_used    9799
_cell_measurement_temperature    100
_cell_measurement_theta_max      70.12
_cell_measurement_theta_min      5.68
_cell_volume                     619.7(2)
_computing_cell_refinement       'SAINT V8.40A (Bruker, 2019)'
_computing_data_reduction        'SAINT V8.40A (Bruker, 2019)'
_computing_molecular_graphics    'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL  (Sheldrick, 2008)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100
_diffrn_detector                 'PHOTON 100 CMOS DETECTOR'
_diffrn_detector_area_resol_mean 10.4167
_diffrn_detector_type            'PHOTON 100 CMOS'
_diffrn_measured_fraction_theta_full 0.963
_diffrn_measured_fraction_theta_max 0.963
_diffrn_measurement_device       '\k-Geometry Diffractometer'
_diffrn_measurement_device_type  'Bruker D8 Venture'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_collimation    '0.6 mm'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_radiation_xray_symbol    K-L~3~
_diffrn_reflns_av_R_equivalents  0.0489
_diffrn_reflns_av_unetI/netI     0.0300
_diffrn_reflns_Laue_measured_fraction_full 0.963
_diffrn_reflns_Laue_measured_fraction_max 0.963
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       5
_diffrn_reflns_limit_l_min       -5
_diffrn_reflns_number            16549
_diffrn_reflns_point_group_measured_fraction_full 0.936
_diffrn_reflns_point_group_measured_fraction_max 0.936
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         69.980
_diffrn_reflns_theta_min         5.680
_diffrn_source                   'X-ray tube'
_diffrn_source_current           50.0
_diffrn_source_power             2.5
_diffrn_source_target            Cu
_diffrn_source_type              'Micro focus tube'
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.341
_exptl_absorpt_correction_T_max  0.7533
_exptl_absorpt_correction_T_min  0.5983
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.1331 before and 0.0779 after correction.
The Ratio of minimum to maximum transmission is 0.7942.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            'clear light yellow'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.684
_exptl_crystal_description       block
_exptl_crystal_F_000             320
_exptl_crystal_size_max          1
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.252
_refine_diff_density_min         -0.321
_refine_diff_density_rms         0.066
_refine_ls_abs_structure_details
;
 Flack x determined using 455 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.12(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.496
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     101
_refine_ls_number_reflns         1100
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.495
_refine_ls_R_factor_all          0.0363
_refine_ls_R_factor_gt           0.0362
_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^)+(0.0104P)^2^+0.4478P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1059
_refine_ls_wR_factor_ref         0.1060
_reflns_Friedel_coverage         0.713
_reflns_Friedel_fraction_full    0.902
_reflns_Friedel_fraction_max     0.902
_reflns_number_gt                1093
_reflns_number_total             1100
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d1ra06963b2.cif
_cod_data_source_block           etoh1_lt_0ma_a
_cod_original_cell_volume        619.6(2)
_cod_database_code               7243983
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.987
_shelx_estimated_absorpt_t_min   0.347
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All N(H,H) groups
 At 1.5 times of:
  All O(H) groups
2.a Aromatic/amide H refined with riding coordinates:
 C2(H2)
2.b X=CH2 refined with riding coordinates:
 N3(H3A,H3B)
2.c Idealised tetrahedral OH refined as rotating group:
 O1(H1)
;
_shelx_res_checksum              97469
_olex2_submission_original_sample_id ETOH1
_olex2_submission_special_instructions 'No special instructions were received'