Intramolecular Cycloadditions of Photogenerated Azaxylylenes with Oxadiazoles Provide Direct Access to Versatile Polyheterocyclic Ketopiperazines Containing a Spiro-oxirane Moiety.
Kumar, N. N. Bhuvan; Kuznetsov, Dmitry M.; Kutateladze, Andrei G.; Organic letters 17 (2015) 438–441; doi:10.1021/ol5033909

data_1518575
_publ_section_title
;
 Intramolecular Cycloadditions of Photogenerated Azaxylylenes with
 Oxadiazoles Provide Direct Access to Versatile Polyheterocyclic
 Ketopiperazines Containing a Spiro-oxirane Moiety.
;
_journal_issue                   3
_journal_name_full               'Organic letters'
_journal_page_first              438
_journal_page_last               441
_journal_paper_doi               10.1021/ol5033909
_journal_volume                  17
_journal_year                    2015
_chemical_formula_moiety         'C26 H22 N2 O4'
_chemical_formula_sum            'C26 H22 N2 O4'
_chemical_formula_weight         426.46
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 97.847(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.1999(5)
_cell_length_b                   23.6360(14)
_cell_length_c                   10.7112(6)
_cell_measurement_reflns_used    9048
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      26.00
_cell_measurement_theta_min      2.51
_cell_volume                     2056.5(2)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_detector_area_resol_mean 8.33
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker D8 APEX II Diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0364
_diffrn_reflns_av_sigmaI/netI    0.0082
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       29
_diffrn_reflns_limit_k_min       -29
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            117315
_diffrn_reflns_theta_full        26.03
_diffrn_reflns_theta_max         26.03
_diffrn_reflns_theta_min         1.72
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_T_max  0.9898
_exptl_absorpt_correction_T_min  0.9196
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.377
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             896
_exptl_crystal_size_max          0.91
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.228
_refine_diff_density_min         -0.168
_refine_diff_density_rms         0.032
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_matrix_type           full
_refine_ls_number_parameters     291
_refine_ls_number_reflns         4051
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.034
_refine_ls_R_factor_all          0.0422
_refine_ls_R_factor_gt           0.0389
_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^)+(0.0496P)^2^+0.7466P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1026
_refine_ls_wR_factor_ref         0.1056
_reflns_number_gt                3707
_reflns_number_total             4051
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol5033909_si_001.cif
_cod_data_source_block           Compound2c
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/home/saulius/struct/COD-crude-data--automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2935 2014-11-11 08:27:57Z andrius 

 Adding full bibliography for 1518573--1518580.cif.
;
_cod_original_sg_symbol_H-M      'P2(1)/c  '
_cod_database_code               1518575