Auto-oxidation-driven vicinal C(sp<sup>3</sup>)-H desaturative cyclization of tertiary alkylamines for the synthesis of pyrido[3,2-<i>c</i>]coumarins.
Bai, Fang; Liu, Pengpeng; Xu, Hongyan; Li, Mengjie; Liu, Binghui; Xu, Miaomiao; Gao, Qinghe; Chemical communications (Cambridge, England) 61 (2025) 16818–16821; doi:10.1039/d5cc04794c

data_7135023
_publ_section_title
;
 Auto-oxidation-driven vicinal C(sp<sup>3</sup>)-H desaturative
 cyclization of tertiary alkylamines for the synthesis of
 pyrido[3,2-<i>c</i>]coumarins.
;
_journal_issue                   86
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              16818
_journal_page_last               16821
_journal_paper_doi               10.1039/d5cc04794c
_journal_volume                  61
_journal_year                    2025
_chemical_formula_moiety         'C21 H17 N O2'
_chemical_formula_sum            'C21 H17 N O2'
_chemical_formula_weight         315.36
_space_group_crystal_system      orthorhombic
_space_group_IT_number           62
_space_group_name_Hall           '-P 2ac 2n'
_space_group_name_H-M_alt        'P n m a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2024-09-03
_audit_creation_method
;
Olex2 1.3
(compiled 2020.11.12 svn.r5f609507 for OlexSys, GUI svn.r6403)
;
_audit_update_record
;
2025-07-18 deposited with the CCDC.	2025-09-22 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   15.204(14)
_cell_length_b                   6.943(7)
_cell_length_c                   15.282(13)
_cell_measurement_reflns_used    3715
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      22.88
_cell_measurement_theta_min      2.67
_cell_volume                     1613(3)
_computing_cell_refinement       'SAINT V8.40B (?, 2016)'
_computing_data_reduction        'SAINT V8.40B (?, 2016)'
_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      296.15
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0699
_diffrn_reflns_av_unetI/netI     0.0323
_diffrn_reflns_Laue_measured_fraction_full 0.994
_diffrn_reflns_Laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            20639
_diffrn_reflns_point_group_measured_fraction_full 0.994
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        25.094
_diffrn_reflns_theta_max         25.094
_diffrn_reflns_theta_min         2.666
_diffrn_source_current           30.0
_diffrn_source_power             1.5
_diffrn_source_voltage           50.0
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.7452
_exptl_absorpt_correction_T_min  0.6614
_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.0680 before and 0.0594 after correction.
The Ratio of minimum to maximum transmission is 0.8875.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            'clear whiteish colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   whiteish
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.298
_exptl_crystal_description       block
_exptl_crystal_F_000             664
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.119
_refine_diff_density_min         -0.167
_refine_diff_density_rms         0.031
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         1552
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0983
_refine_ls_R_factor_gt           0.0517
_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^)+(0.0663P)^2^+0.4086P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1189
_refine_ls_wR_factor_ref         0.1452
_reflns_Friedel_coverage         0.000
_reflns_number_gt                965
_reflns_number_total             1552
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5cc04794c2.cif
_cod_data_source_block           1_a
_cod_depositor_comments          'Adding full bibliography for 7135023.cif.'
_cod_database_code               7135023
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_max   0.985
_shelx_estimated_absorpt_t_min   0.982
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C17(H17)
2.b Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C4(H4), C5(H5), C10(H10), C14(H14), C15(H15), C16(H16)
2.c Idealised Me refined as rotating group:
 C18(H18A,H18B,H18C)
;
_shelx_res_checksum              95792
_olex2_submission_special_instructions 'No special instructions were received'