A C1-symmetric N-heterocyclic carbene catalysed oxidative spiroannulation of isatin-derived enals: highly enantioselective synthesis of spirooxindole δ-lactones
Lin, Jun-Bing; Cheng, Xi-Na; Tian, Xiao-Dong; Xu, Guo-Qiang; Luo, Yong-Chun; Xu, Peng-Fei; RSC Advances 8 (2018) 15444–; doi:10.1039/C8RA02009D

data_7230549
_publ_section_title
;
 A C1-symmetric N-heterocyclic carbene catalysed oxidative spiroannulation
 of isatin-derived enals: highly enantioselective synthesis of
 spirooxindole \d-lactones
;
_journal_issue                   28
_journal_name_full               'RSC Advances'
_journal_page_first              15444
_journal_paper_doi               10.1039/C8RA02009D
_journal_volume                  8
_journal_year                    2018
_chemical_absolute_configuration none
_chemical_formula_moiety         'C27 H21 N O4'
_chemical_formula_sum            'C27 H21 N O4'
_chemical_formula_weight         423.45
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             2014-03-14
_audit_creation_method
;
Olex2 1.2
(compiled 2014.02.28 svn.r2899 for OlexSys, GUI svn.r4781)
;
_audit_update_record
;
2014-06-27 deposited with the CCDC.
2018-04-02 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.1093(2)
_cell_length_b                   12.6235(3)
_cell_length_c                   15.3660(3)
_cell_measurement_reflns_used    7423
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      70.4220
_cell_measurement_theta_min      4.5120
_cell_volume                     2154.90(8)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
(compiled Feb  1 2013,16:14:44)
;
_computing_data_collection
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
(compiled Feb  1 2013,16:14:44)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
(compiled Feb  1 2013,16:14:44)
;
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 16.0733
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Eos'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_UB_11      0.0804302000
_diffrn_orient_matrix_UB_12      -0.0824045000
_diffrn_orient_matrix_UB_13      -0.0457613000
_diffrn_orient_matrix_UB_21      -0.1013261000
_diffrn_orient_matrix_UB_22      -0.0222397000
_diffrn_orient_matrix_UB_23      -0.0658732000
_diffrn_orient_matrix_UB_31      0.0499294000
_diffrn_orient_matrix_UB_32      0.0872347000
_diffrn_orient_matrix_UB_33      -0.0601498000
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.5418
_diffrn_reflns_av_R_equivalents  0.0332
_diffrn_reflns_av_unetI/netI     0.0284
_diffrn_reflns_Laue_measured_fraction_full 0.995
_diffrn_reflns_Laue_measured_fraction_max 0.990
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            11843
_diffrn_reflns_point_group_measured_fraction_full 0.990
_diffrn_reflns_point_group_measured_fraction_max 0.978
_diffrn_reflns_theta_full        67.680
_diffrn_reflns_theta_max         70.683
_diffrn_reflns_theta_min         4.533
_diffrn_source                   'SuperNova (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    0.711
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.62876
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
(compiled Feb  1 2013,16:14:44)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_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    1.305
_exptl_crystal_description       block
_exptl_crystal_F_000             888
_exptl_crystal_size_max          0.31
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.156
_refine_diff_density_min         -0.163
_refine_diff_density_rms         0.037
_refine_ls_abs_structure_details
;
 Flack x determined using 1618 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   -0.17(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.040
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     290
_refine_ls_number_reflns         4052
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.040
_refine_ls_R_factor_all          0.0432
_refine_ls_R_factor_gt           0.0418
_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^)+(0.0739P)^2^+0.1504P]
 where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1096
_refine_ls_wR_factor_ref         0.1119
_reflns_Friedel_coverage         0.736
_reflns_Friedel_fraction_full    0.985
_reflns_Friedel_fraction_max     0.962
_reflns_number_gt                3898
_reflns_number_total             4052
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8ra02009d2.cif
_cod_data_source_block           chenxn0312
_cod_original_cell_volume        2154.91(8)
_cod_database_code               7230549
_shelxl_version_number           2013-2
_reflns_odcompleteness_completeness 99.41
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     66.97
_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:
 C9(H9A,H9B), C21(H21A,H21B)
2.b Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C4(H4), C5(H5), C15(H15), C16(H16), C17(H17), C18(H18),
 C19(H19), C23(H23), C24(H24), C25(H25), C26(H26), C27(H27)
2.c Idealised Me refined as rotating group:
 C20(H20A,H20B,H20C)
;
_shelx_res_checksum              514
_olex2_computing_structure_refinement_long 'ShelXL (Sheldrick, 2008)'
_olex2_computing_structure_solution_long 'ShelXS (Sheldrick, 2008)'