Metal-free dearomative [5+2]/[2+2] cycloaddition of 1<i>H</i>-indoles with <i>ortho</i>-(trimethylsilyl)aryl triflates.
Chen, Xinyu; Yang, Na; Zeng, Wen; Wang, Lei; Li, Pinhua; Li, Hongji; Chemical communications (Cambridge, England) 57 (2021) 7047–7050; doi:10.1039/d1cc02550c

data_7128524
_publ_section_title
;
 Metal-free dearomative [5+2]/[2+2] cycloaddition of 1<i>H</i>-indoles
 with <i>ortho</i>-(trimethylsilyl)aryl triflates.
;
_journal_issue                   57
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              7047
_journal_page_last               7050
_journal_paper_doi               10.1039/d1cc02550c
_journal_volume                  57
_journal_year                    2021
_chemical_formula_moiety         'C20 H15 N'
_chemical_formula_sum            'C20 H15 N'
_chemical_formula_weight         269.33
_space_group_crystal_system      orthorhombic
_space_group_IT_number           29
_space_group_name_Hall           'P 2c -2ac'
_space_group_name_H-M_alt        'P c a 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_date             2021-03-19
_audit_creation_method
;
Olex2 1.2
(compiled 2016.02.19 svn.r3266 for OlexSys, GUI svn.r5155)
;
_audit_update_record
;
2021-03-19 deposited with the CCDC.	2021-06-15 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   18.566(2)
_cell_length_b                   5.4612(7)
_cell_length_c                   14.391(2)
_cell_measurement_reflns_used    1605
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      27.50
_cell_measurement_theta_min      2.61
_cell_volume                     1459.1(3)
_computing_cell_refinement       'SAINT v8.34A (Bruker, 2013)'
_computing_data_collection       'Bruker SMART'
_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, 2015)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      296.15
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0602
_diffrn_reflns_av_unetI/netI     0.0721
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       3
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6897
_diffrn_reflns_point_group_measured_fraction_full 0.994
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         25.000
_diffrn_reflns_theta_min         3.583
_exptl_absorpt_coefficient_mu    0.071
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6280
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2014/5 (Bruker,2014/5) was used for absorption correction.
wR2(int) was 0.0705 before and 0.0328 after correction.
The Ratio of minimum to maximum transmission is 0.8423.
The \l/2 correction factor is 0.00150.
;
_exptl_crystal_colour            COLORLESS
_exptl_crystal_density_diffrn    1.226
_exptl_crystal_description       BLOCK
_exptl_crystal_F_000             568
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.107
_refine_diff_density_min         -0.129
_refine_diff_density_rms         0.027
_refine_ls_abs_structure_details
;
 Flack x determined using 618 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.3(10)
_refine_ls_extinction_coef       0.018(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.025
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     191
_refine_ls_number_reflns         2555
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.025
_refine_ls_R_factor_all          0.0866
_refine_ls_R_factor_gt           0.0503
_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^)+(0.0366P)^2^+0.0253P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0844
_refine_ls_wR_factor_ref         0.0915
_reflns_Friedel_coverage         0.907
_reflns_Friedel_fraction_full    0.990
_reflns_Friedel_fraction_max     0.990
_reflns_number_gt                1786
_reflns_number_total             2555
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d1cc02550c2.cif
_cod_data_source_block           1
_cod_depositor_comments
'Adding full bibliography for 7128523--7128524.cif.'
_cod_database_code               7128524
_shelx_estimated_absorpt_t_max   0.985
_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. Rigid bond restraints
 N1, C20
 with sigma for 1-2 distances of 0.001 and sigma for 1-3 distances of 0.002
 N1, C7
 with sigma for 1-2 distances of 0.001 and sigma for 1-3 distances of 0.002
3.a Secondary CH2 refined with riding coordinates:
 C14(H14A,H14B)
3.b Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C4(H4), C5(H5), C9(H9), C10(H10), C11(H11), C12(H12),
 C16(H16), C17(H17), C18(H18), C19(H19), C0AA(H0AA)
;
_shelx_res_checksum              24839
_shelx_hkl_checksum              67903
_shelx_shelxl_version_number     2014/7
_olex2_submission_special_instructions 'No special instructions were received'