Diastereoselective tandem oxidation/Michael/aldol reaction: unprecedented formation of dispirocyclopentanebisoxindoles and dispiro[acenaphthylene-1,1'-cyclopentane-3',1''-acenaphthylene]-2,2''diones.
Suman, Koorathota; Ramanjaneyulu, Mala; Thennarasu, Sathiah; Organic & biomolecular chemistry 15 (2017) 1961–1964; doi:10.1039/c6ob02607a

data_7155483
_publ_section_title
;
 Diastereoselective tandem oxidation/Michael/aldol reaction: unprecedented
 formation of dispirocyclopentanebisoxindoles and
 dispiro[acenaphthylene-1,1'-cyclopentane-3',1''-acenaphthylene]-2,2''diones.
;
_journal_issue                   9
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              1961
_journal_page_last               1964
_journal_paper_doi               10.1039/c6ob02607a
_journal_volume                  15
_journal_year                    2017
_chemical_formula_sum            'C46 H36 N2 O4'
_chemical_formula_weight         680.77
_space_group_IT_number           2
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_block_doi                 10.5517/ccdc.csd.cc1jg9gr
_audit_creation_method           SHELXL-97
_audit_update_record
;
2017-01-27 deposited with the CCDC.
2017-02-02 downloaded from the CCDC.
;
_cell_angle_alpha                89.482(5)
_cell_angle_beta                 68.529(5)
_cell_angle_gamma                73.872(5)
_cell_formula_units_Z            2
_cell_length_a                   11.751(5)
_cell_length_b                   12.712(5)
_cell_length_c                   13.460(5)
_cell_measurement_temperature    293(2)
_cell_volume                     1787.8(12)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.975
_diffrn_measured_fraction_theta_max 0.975
_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  0.0358
_diffrn_reflns_av_sigmaI/netI    0.0539
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            23715
_diffrn_reflns_theta_full        26.43
_diffrn_reflns_theta_max         26.43
_diffrn_reflns_theta_min         1.63
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_T_max  0.9920
_exptl_absorpt_correction_T_min  0.9841
_exptl_crystal_density_diffrn    1.265
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             716
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.303
_refine_diff_density_min         -0.183
_refine_diff_density_rms         0.040
_refine_ls_extinction_coef       0.0085(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.006
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     471
_refine_ls_number_reflns         7171
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.006
_refine_ls_R_factor_all          0.1185
_refine_ls_R_factor_gt           0.0497
_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^)+(0.0669P)^2^+0.3984P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1188
_refine_ls_wR_factor_ref         0.1568
_reflns_number_gt                3717
_reflns_number_total             7171
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6ob02607a2.cif
_cod_data_source_block           fin
_cod_depositor_comments          'Adding full bibliography for 7155483.cif.'
_cod_database_code               7155483