Synthesis of indolizines from pyridinium 1,4-zwitterionic thiolates and propiolic acid derivatives via a formal [4 + 1] pathway.
Cheng, Bin; Li, Hui; Duan, Shengguo; Zhang, Xinping; He, Yixuan; Li, Yuntong; Li, Yun; Wang, Taimin; Zhai, Hongbin; Organic & biomolecular chemistry 18 (2020) 6253–6257; doi:10.1039/d0ob01398f

data_7157601
_publ_section_title
;
 Synthesis of indolizines from pyridinium 1,4-zwitterionic thiolates and
 propiolic acid derivatives via a formal [4 + 1] pathway.
;
_journal_issue                   32
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              6253
_journal_page_last               6257
_journal_paper_doi               10.1039/d0ob01398f
_journal_volume                  18
_journal_year                    2020
_chemical_formula_moiety         'C16 H17 N O6'
_chemical_formula_sum            'C16 H17 N O6'
_chemical_formula_weight         319.30
_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     direct
_audit_creation_date             2019-11-25
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2019-12-05 deposited with the CCDC.	2020-07-23 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 110.614(7)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   19.975(8)
_cell_length_b                   4.999(2)
_cell_length_c                   17.260(7)
_cell_measurement_reflns_used    1251
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      20.42
_cell_measurement_theta_min      2.32
_cell_volume                     1613.1(11)
_computing_cell_refinement       'SAINT v7.68A (Bruker, 2009)'
_computing_data_reduction        'SAINT v7.68A (Bruker, 2009)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      296.15
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0421
_diffrn_reflns_av_unetI/netI     0.0523
_diffrn_reflns_Laue_measured_fraction_full 0.994
_diffrn_reflns_Laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            7458
_diffrn_reflns_point_group_measured_fraction_full 0.994
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        25.021
_diffrn_reflns_theta_max         25.021
_diffrn_reflns_theta_min         1.089
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.101
_exptl_absorpt_correction_T_max  0.7452
_exptl_absorpt_correction_T_min  0.5216
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2008/1 (Bruker,2008) was used for absorption correction.
wR2(int) was 0.1176 before and 0.0458 after correction.
The Ratio of minimum to maximum transmission is 0.6999.
The \l/2 correction factor is 0.0015.
;
_exptl_crystal_colour            'clear light colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.315
_exptl_crystal_description       block
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.285
_refine_diff_density_min         -0.259
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.996
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     211
_refine_ls_number_reflns         2819
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.996
_refine_ls_R_factor_all          0.1179
_refine_ls_R_factor_gt           0.0609
_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^)+(0.1250P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1694
_refine_ls_wR_factor_ref         0.2168
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1493
_reflns_number_total             2819
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0ob01398f2.cif
_cod_data_source_block           1
_cod_depositor_comments          'Adding full bibliography for 7157601.cif.'
_cod_original_cell_volume        1613.3(12)
_cod_database_code               7157601
_shelx_shelxl_version_number     2018/3
_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 Secondary CH2 refined with riding coordinates:
 C13(H13A,H13B), C15(H15A,H15B)
2.b Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C4(H4)
2.c Idealised Me refined as rotating group:
 C10(H10A,H10B,H10C), C12(H12A,H12B,H12C), C16(H16A,H16B,H16C)
;
_shelx_res_checksum              74145
_olex2_submission_special_instructions 'No special instructions were received'