α-Keto amides as precursors to heterocycles—generation and cycloaddition reactions of piperazin-5-one nitrones
Heaney, Frances; Fenlon, Julie; McArdle, Patrick; Cunningham, Desmond; Organic & Biomolecular Chemistry 1 (2003) 1122–; doi:10.1039/b210943n

data_7151378
_publ_section_title
;
 \a-Keto amides as precursors to heterocycles---generation and
 cycloaddition reactions of piperazin-5-one nitrones
;
_journal_issue                   7
_journal_name_full               'Organic &amp;  Biomolecular Chemistry'
_journal_page_first              1122
_journal_paper_doi               10.1039/b210943n
_journal_volume                  1
_journal_year                    2003
_chemical_formula_sum            'C22 H23 N O5'
_chemical_formula_weight         381.41
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 108.21(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.243(6)
_cell_length_b                   8.697(4)
_cell_length_c                   15.245(10)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      18
_cell_measurement_theta_min      12
_cell_volume                     1919.8(18)
_computing_cell_refinement       'XDS (W.Kabsch, 2000)'
_computing_data_collection       'Marresearch MarControl software'
_computing_data_reduction        'XDS (W.Kabsch, 2000)'
_computing_molecular_graphics    'ORTEX (P.McArdle, 1995)'
_computing_publication_material  'SHELXL-97/2 (Sheldrick,1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.881
_diffrn_measured_fraction_theta_max 0.881
_diffrn_measurement_device_type  'Marresearch image plate'
_diffrn_measurement_method       '180 mm image plate'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0646
_diffrn_reflns_av_sigmaI/netI    0.0696
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            3086
_diffrn_reflns_theta_full        20.90
_diffrn_reflns_theta_max         20.90
_diffrn_reflns_theta_min         1.65
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.320
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Parallelepiped
_exptl_crystal_F_000             808
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.168
_refine_diff_density_min         -0.183
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.063
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     264
_refine_ls_number_reflns         1796
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.063
_refine_ls_R_factor_all          0.0918
_refine_ls_R_factor_gt           0.0648
_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^)+(0.0731P)^2^+1.7815P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1562
_refine_ls_wR_factor_ref         0.1726
_reflns_number_gt                1310
_reflns_number_total             1796
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b210943n.txt
_cod_data_source_block           11c
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'None' changed to
'none' according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_cell_volume        1919.8(17)
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7151378