Chiral Aryliodine-Mediated Enantioselective Organocatalytic Spirocyclization: Synthesis of Spirofurooxindoles via Cascade Oxidative C-O and C-C Bond Formation.
Cao, Yang; Zhang, Xiang; Lin, Guangyu; Zhang-Negrerie, Daisy; Du, Yunfei; Organic letters 18 (2016) 5580–5583; doi:10.1021/acs.orglett.6b02816

data_1555882
_publ_section_title
;
 Chiral Aryliodine-Mediated Enantioselective Organocatalytic
 Spirocyclization: Synthesis of Spirofurooxindoles via Cascade Oxidative
 C-O and C-C Bond Formation.
;
_journal_issue                   21
_journal_name_full               'Organic letters'
_journal_page_first              5580
_journal_page_last               5583
_journal_paper_doi               10.1021/acs.orglett.6b02816
_journal_volume                  18
_journal_year                    2016
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C15 H15 N O4'
_chemical_formula_sum            'C15 H15 N O4'
_chemical_formula_weight         273.28
_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'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_method           SHELXL-2014/8
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.56310(8)
_cell_length_b                   11.52249(11)
_cell_length_c                   13.97167(11)
_cell_measurement_reflns_used    10118
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      78.8250
_cell_measurement_theta_min      3.1180
_cell_volume                     1378.56(2)
_computing_cell_refinement       'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_data_collection       'CrystalClear-SM Expert 2.1 b42 (Rigaku, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL-2014/8 (Sheldrick, 2014)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Rigaku Xtalab P200'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0187
_diffrn_reflns_av_unetI/netI     0.0150
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            11908
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.984
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         79.088
_diffrn_reflns_theta_min         4.975
_diffrn_source                   'rotating anode'
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.797
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.80907
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
CrysAlisPro 1.171.38.41 (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.317
_exptl_crystal_description       prism
_exptl_crystal_F_000             576
_exptl_crystal_size_max          0.240
_exptl_crystal_size_mid          0.180
_exptl_crystal_size_min          0.160
_refine_diff_density_max         0.140
_refine_diff_density_min         -0.153
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details
; 
 Flack x determined using 1182 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   0.08(7)
_refine_ls_extinction_coef       0.0140(12)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/8 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     184
_refine_ls_number_reflns         2942
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0298
_refine_ls_R_factor_gt           0.0293
_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^)+(0.0572P)^2^+0.0953P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0834
_refine_ls_wR_factor_ref         0.0839
_reflns_Friedel_coverage         0.715
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.970
_reflns_number_gt                2868
_reflns_number_total             2942
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol6b02816_si_003.cif
_cod_data_source_block           p20160406a
_cod_database_code               1555882
_shelx_shelxl_version_number     2014/8
_shelx_estimated_absorpt_t_min   0.832
_shelx_estimated_absorpt_t_max   0.883
_shelx_res_checksum              44001
_shelx_hkl_checksum              13889