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_1518573
_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         'C25 H20 N2 O4'
_chemical_formula_sum            'C25 H20 N2 O4'
_chemical_formula_weight         412.43
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_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
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_atom_sites_solution_secondary   difmap
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_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.359(3)
_cell_length_b                   8.616(2)
_cell_length_c                   22.998(5)
_cell_measurement_reflns_used    9463
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      27.03
_cell_measurement_theta_min      2.46
_cell_volume                     2027.8(9)
_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'
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_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_detector_area_resol_mean 8.33
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker D8 APEX II Diffractometer'
_diffrn_measurement_method       '\f and \w scans'
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_diffrn_radiation_source         'fine-focus sealed tube'
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_diffrn_reflns_limit_h_min       -12
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_diffrn_reflns_limit_l_min       -28
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_diffrn_reflns_theta_max         25.70
_diffrn_reflns_theta_min         1.79
_exptl_absorpt_coefficient_mu    0.093
_exptl_absorpt_correction_T_max  0.9936
_exptl_absorpt_correction_T_min  0.9806
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.351
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
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_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0762P)^2^+1.0169P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1330
_refine_ls_wR_factor_ref         0.1563
_reflns_number_gt                2727
_reflns_number_total             3850
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol5033909_si_001.cif
_cod_data_source_block           Compound2a
_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_cell_volume        2027.6(9)
_cod_original_sg_symbol_H-M      'P2(1)/c  '
_cod_database_code               1518573