Catalyst-free inverse-electron-demand aza-Diels-Alder reaction of 4,4-dicyano-2-methylenebut-3-enoates and 1,3,5-triazinanes: access to polysubstituted tetrahydropyridines.
Yang, Dezhi; Zhu, Meng; Wang, Taimin; He, Yixuan; Xie, Lang; Zhang, Jiayong; Cheng, Bin; Organic & biomolecular chemistry 21 (2023) 5413–5418; doi:10.1039/d3ob00511a

data_7159449
_publ_section_title
;
 Catalyst-free inverse-electron-demand aza-Diels-Alder reaction of
 4,4-dicyano-2-methylenebut-3-enoates and 1,3,5-triazinanes: access to
 polysubstituted tetrahydropyridines.
;
_journal_issue                   26
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              5413
_journal_page_last               5418
_journal_paper_doi               10.1039/d3ob00511a
_journal_volume                  21
_journal_year                    2023
_chemical_formula_moiety         'C21 H20 N2 O3'
_chemical_formula_sum            'C21 H20 N2 O3'
_chemical_formula_weight         348.39
_space_group_crystal_system      monoclinic
_space_group_IT_number           9
_space_group_name_Hall           'C -2yc'
_space_group_name_H-M_alt        'C 1 c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2023-03-28
_audit_creation_method
;
Olex2 1.5
(compiled 2023.03.06 svn.rbb2c1857 for OlexSys, GUI svn.r6748)
;
_audit_update_record
;
2023-03-28 deposited with the CCDC.	2023-06-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 95.421(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.7031(7)
_cell_length_b                   10.4099(7)
_cell_length_c                   17.7960(10)
_cell_measurement_reflns_used    9935
_cell_measurement_temperature    100.0(2)
_cell_measurement_theta_max      27.49
_cell_measurement_theta_min      2.88
_cell_volume                     1789.5(2)
_computing_cell_refinement       'SAINT V8.40B (?, 2016)'
_computing_data_collection       'Apex3 (Bruker 2018)'
_computing_data_reduction        'SAINT V8.40B (?, 2016)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2019/2 (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT 2014'
_diffrn_ambient_temperature      100.0(2)
_diffrn_detector                 'Bruker PHOTON III area detector'
_diffrn_detector_area_resol_mean 7.9
_diffrn_detector_type            'CMOS area detector'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device       'three-circle diffractometer'
_diffrn_measurement_device_type  'Bruker D8 VENTURE'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_monochromator  'mirror optics'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0397
_diffrn_reflns_av_unetI/netI     0.0280
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            21287
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.995
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.491
_diffrn_reflns_theta_min         2.877
_diffrn_source                   'microfocus Metaljet'
_diffrn_source_current           1.0
_diffrn_source_power             0.05
_diffrn_source_type              'Incoatec Metaljet'
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.087
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.7088
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.0911 before and 0.0517 after correction.
The Ratio of minimum to maximum transmission is 0.9506.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.293
_exptl_crystal_description       block
_exptl_crystal_F_000             736
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.31
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.248
_refine_diff_density_min         -0.147
_refine_diff_density_rms         0.035
_refine_ls_abs_structure_details
;
 Flack x determined using 1871 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.4(2)
_refine_ls_extinction_coef       0.0037(8)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2019/2 (Sheldrick 2019)'
_refine_ls_goodness_of_fit_ref   1.048
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     238
_refine_ls_number_reflns         4095
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.048
_refine_ls_R_factor_all          0.0303
_refine_ls_R_factor_gt           0.0286
_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^)+(0.0433P)^2^+0.4534P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0728
_refine_ls_wR_factor_ref         0.0740
_reflns_Friedel_coverage         0.992
_reflns_Friedel_fraction_full    0.997
_reflns_Friedel_fraction_max     0.993
_reflns_number_gt                3934
_reflns_number_total             4095
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d3ob00511a2.cif
_cod_data_source_block           mo_cxy1981_0m
_cod_database_code               7159449
_shelx_shelxl_version_number     2019/2
_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
2.a Ternary CH refined with riding coordinates:
 C17(H17)
2.b Secondary CH2 refined with riding coordinates:
 C5(H5A,H5B), C16(H16A,H16B)
2.c Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C9(H9), C10(H10), C14(H14), C15(H15), C20(H20),
 C21(H21)
2.d Idealised Me refined as rotating group:
 C12(H12A,H12B,H12C), C19(H19A,H19B,H19C)
;
_shelx_res_checksum              35656
_olex2_submission_special_instructions 'No special instructions were received'