Directed oxidative cyclizations to C2- or C4-positions of indole: efficient construction of the bicyclo[4.3.1]decane core of welwitindolinones.
Bhat, Vikram; Mackay, James A.; Rawal, Viresh H.; Organic letters 13 (2011) 3214–3217; doi:10.1021/ol201122f

data_1502242
_publ_section_title
;
 Directed oxidative cyclizations to C2- or C4-positions of indole:
 efficient construction of the bicyclo[4.3.1]decane core of
 welwitindolinones.
;
_journal_issue                   12
_journal_name_full               'Organic letters'
_journal_page_first              3214
_journal_page_last               3217
_journal_paper_doi               10.1021/ol201122f
_journal_volume                  13
_journal_year                    2011
_chemical_formula_sum            'C20 H23 N O3'
_chemical_formula_weight         325.39
_space_group_IT_number           9
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 c 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                 107.204(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.639(3)
_cell_length_b                   15.230(3)
_cell_length_c                   10.594(2)
_cell_measurement_temperature    100(2)
_cell_volume                     1639.8(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.965
_diffrn_measured_fraction_theta_max 0.965
_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  0.0262
_diffrn_reflns_av_sigmaI/netI    0.0357
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            9608
_diffrn_reflns_theta_full        28.29
_diffrn_reflns_theta_max         28.29
_diffrn_reflns_theta_min         2.41
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  1.0
_exptl_absorpt_correction_T_min  0.819
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
absorption corrections were made based on correspondance of
equivalent intensities usingprogram SADABS (G. Sheldrick, Bruker 
Analytical X-ray Systems, Madison, WI)
;
_exptl_crystal_density_diffrn    1.318
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             696
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.238
_refine_diff_density_min         -0.182
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.2(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.000
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     221
_refine_ls_number_reflns         3868
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.000
_refine_ls_R_factor_all          0.0348
_refine_ls_R_factor_gt           0.0332
_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^)+(0.0439P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0750
_refine_ls_wR_factor_ref         0.0758
_reflns_number_gt                3666
_reflns_number_total             3868
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol201122f_si_001.cif
_cod_data_source_block           bhat01x
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               1502242