Dearomatization [4+2] cycloaddition for constructing bridged polycyclic lactams.
Wu, Qile; Chen, Jingyi; Wu, Haoxian; Wang, Shasha; Liang, Jiaxin; Lo, Tsz Woon Benedict; Zhu, Zhongzhi; Chen, Xiuwen; Chemical communications (Cambridge, England) 61 (2025) 12789–12792; doi:10.1039/d5cc03128a

data_1575119
_publ_section_title
;
 Dearomatization [4+2] cycloaddition for constructing bridged polycyclic
 lactams.
;
_journal_issue                   68
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              12789
_journal_page_last               12792
_journal_paper_doi               10.1039/d5cc03128a
_journal_volume                  61
_journal_year                    2025
_chemical_formula_moiety         'C19 H15 N O4'
_chemical_formula_sum            'C19 H15 N O4'
_chemical_formula_weight         321.32
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2024-12-23
_audit_creation_method
;
Olex2 1.3
(compiled 2020.11.12 svn.r5f609507 for OlexSys, GUI svn.r6403)
;
_audit_update_record
;
2025-03-28 deposited with the CCDC.	2025-07-17 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 106.13(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   16.448(16)
_cell_length_b                   8.875(8)
_cell_length_c                   11.894(11)
_cell_measurement_reflns_used    3207
_cell_measurement_temperature    296.15
_cell_measurement_theta_max      20.79
_cell_measurement_theta_min      2.58
_cell_volume                     1668(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 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      296.15
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_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  0.0515
_diffrn_reflns_av_unetI/netI     0.0452
_diffrn_reflns_Laue_measured_fraction_full 0.987
_diffrn_reflns_Laue_measured_fraction_max 0.987
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            14010
_diffrn_reflns_point_group_measured_fraction_full 0.987
_diffrn_reflns_point_group_measured_fraction_max 0.987
_diffrn_reflns_theta_full        24.829
_diffrn_reflns_theta_max         24.829
_diffrn_reflns_theta_min         2.578
_diffrn_source_current           30.0
_diffrn_source_power             1.5
_diffrn_source_voltage           50.0
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_T_max  0.7452
_exptl_absorpt_correction_T_min  0.6230
_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.0777 before and 0.0645 after correction.
The Ratio of minimum to maximum transmission is 0.8360.
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    1.280
_exptl_crystal_description       block
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.137
_refine_diff_density_min         -0.173
_refine_diff_density_rms         0.036
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         2845
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0940
_refine_ls_R_factor_gt           0.0477
_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^)+(0.0477P)^2^+0.5754P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1027
_refine_ls_wR_factor_ref         0.1254
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1799
_reflns_number_total             2845
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5cc03128a2.cif
_cod_data_source_block           1
_cod_depositor_comments
'Adding full bibliography for 1575118--1575119.cif.'
_cod_database_code               1575119
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_max   0.984
_shelx_estimated_absorpt_t_min   0.980
_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:
 C9(H9), C10(H10), C11(H11), C12(H12)
2.b Secondary CH2 refined with riding coordinates:
 C7(H7A,H7B)
2.c Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C4(H4), C5(H5), C15(H15), C16(H16), C17(H17), C18(H18)
;
_shelx_res_checksum              273
_shelx_hkl_checksum              45968
_olex2_submission_special_instructions 'No special instructions were received'