Efficient one-pot synthesis of functionalised imidazo[1,2-a]pyridines and unexpected synthesis of novel tetracyclic derivatives by nucleophilic aromatic substitution
Changunda, Charles R. K.; Venkatesh, B. C.; Mokone, William K.; Rousseau, Amanda L.; Brady, Dean; Fernandes, Manuel A.; Bode, Moira L.; RSC Advances 10 (2020) 8104–8114; doi:10.1039/C9RA10447J

data_7240048
_publ_section_title
;
 Efficient one-pot synthesis of functionalised imidazo[1,2-a]pyridines and
 unexpected synthesis of novel tetracyclic derivatives by nucleophilic
 aromatic substitution
;
_journal_issue                   14
_journal_name_full               'RSC Advances'
_journal_page_first              8104
_journal_page_last               8114
_journal_paper_doi               10.1039/C9RA10447J
_journal_volume                  10
_journal_year                    2020
_chemical_formula_moiety         'C19 H16 N4 O3'
_chemical_formula_sum            'C19 H16 N4 O3'
_chemical_formula_weight         348.36
_chemical_melting_point          462.0(10)
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2019-12-04
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2020-01-20 deposited with the CCDC.	2020-02-17 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 96.086(5)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   20.8879(15)
_cell_length_b                   7.2791(5)
_cell_length_c                   21.5015(15)
_cell_measurement_reflns_used    1315
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      20.55
_cell_measurement_theta_min      2.59
_cell_volume                     3250.8(4)
_computing_cell_refinement       'SAINT v8.34A (Bruker, 2013)'
_computing_data_collection       'APEX2 Ver. 2013.10-0 (Bruker, 2013)'
_computing_data_reduction        'SAINT v8.34A (Bruker, 2013)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015b)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015a)'
_diffrn_ambient_temperature      173.15
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1096
_diffrn_reflns_av_unetI/netI     0.1327
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            10492
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        24.999
_diffrn_reflns_theta_max         24.999
_diffrn_reflns_theta_min         1.905
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.100
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.424
_exptl_crystal_description       needle
_exptl_crystal_F_000             1456
_exptl_crystal_recrystallization_method 'Re-crystallisation from solvent: DCM'
_exptl_crystal_size_max          0.495
_exptl_crystal_size_mid          0.086
_exptl_crystal_size_min          0.063
_refine_diff_density_max         0.163
_refine_diff_density_min         -0.184
_refine_diff_density_rms         0.042
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.780
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     235
_refine_ls_number_reflns         2857
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.780
_refine_ls_R_factor_all          0.1383
_refine_ls_R_factor_gt           0.0444
_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^)+(0.0238P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0686
_refine_ls_wR_factor_ref         0.0847
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1204
_reflns_number_total             2857
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9ra10447j2.cif
_cod_data_source_block           cmpd_17A
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_chemical_melting_point' value '461-463' was changed to
'462.0(10)' -- the average value was taken and precision was
estimated.

Automatic conversion script
Id: cif_fix_values 7556 2019-12-06 15:28:31Z antanas 

 Adding full bibliography for 7240048--7240049.cif.
;
_cod_database_code               7240048
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.994
_shelx_estimated_absorpt_t_min   0.952
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
2.a Ternary CH refined with riding coordinates:
 C6(H6)
2.b Secondary CH2 refined with riding coordinates:
 C7(H7A,H7B), C8(H8A,H8B), C9(H9A,H9B), C10(H10A,H10B)
2.c Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C4(H4), C15(H15), C16(H16), C18(H18), C19(H19)
;
_shelx_res_checksum              54609
_olex2_submission_special_instructions 'No special instructions were received'