N-Heterocyclic Carbene Catalytic [4 + 2] Cyclization of 3-Alkylenyloxindoles with Enals: γ-Carbon Activation for Enantioselective Assembly of Spirocarbocyclic Oxindoles.
Yao, Hong; Zhou, Yu; Chen, Xia; Zhang, Pengfei; Xu, Jinyi; Liu, Hong; The Journal of organic chemistry 81 (2016) 8888–8899; doi:10.1021/acs.joc.6b01596

data_4037142
_publ_section_title
;
 N-Heterocyclic Carbene Catalytic [4 + 2] Cyclization of
 3-Alkylenyloxindoles with Enals: \g-Carbon Activation for
 Enantioselective Assembly of Spirocarbocyclic Oxindoles.
;
_journal_issue                   19
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              8888
_journal_page_last               8899
_journal_paper_doi               10.1021/acs.joc.6b01596
_journal_volume                  81
_journal_year                    2016
_chemical_absolute_configuration ad
_chemical_formula_sum            'C27 H20 Br N O3'
_chemical_formula_weight         486.34
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 110.8110(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   10.3634(3)
_cell_length_b                   7.8244(2)
_cell_length_c                   13.9755(4)
_cell_measurement_temperature    296(2)
_cell_volume                     1059.30(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0227
_diffrn_reflns_av_sigmaI/netI    0.0329
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            14515
_diffrn_reflns_theta_full        24.55
_diffrn_reflns_theta_max         24.55
_diffrn_reflns_theta_min         1.56
_exptl_absorpt_coefficient_mu    1.971
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.525
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             496
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.183
_refine_diff_density_min         -0.142
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.012(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     290
_refine_ls_number_reflns         3463
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0189
_refine_ls_R_factor_gt           0.0176
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0172P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0429
_refine_ls_wR_factor_ref         0.0432
_reflns_number_gt                3329
_reflns_number_total             3463
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo6b01596_si_004.cif
_cod_data_source_block           mo_2015152_0m
_cod_original_sg_symbol_H-M      P21
_cod_database_code               4037142