Synthesis of (S)- and (R)-5-Oxo-piperazine-2-Carboxylic Acid and Its Application to Peptidomimetics
Karine Guitot; Stefano Carboni; Oliver Reiser; Umberto Piarulli; Journal of Organic Chemistry 74 (2009) 8433–8436; doi:10.1021/jo901389q

data_4024945
_publ_section_title
;
Synthesis of (S)- and (R)-5-Oxo-piperazine-2-Carboxylic Acid and Its
Application to Peptidomimetics
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              8433
_journal_page_last               8436
_journal_paper_doi               10.1021/jo901389q
_journal_volume                  74
_journal_year                    2009
_chemical_absolute_configuration ad
_chemical_compound_source        'see text'
_chemical_formula_moiety         'C21 H20 N2 O5'
_chemical_formula_sum            'C21 H20 N2 O5'
_chemical_formula_weight         380.39
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      19
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             'Sep 18 17:30:44 2008'
_audit_creation_method           'PLATON <TABLE ACC> option'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.5176(2)
_cell_length_b                   11.6690(5)
_cell_length_c                   23.9190(9)
_cell_measurement_reflns_used    3767
_cell_measurement_temperature    123
_cell_measurement_theta_max      66.4047
_cell_measurement_theta_min      3.6907
_cell_volume                     1819.13(12)
_computing_cell_refinement
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
;
_computing_data_collection
;
CrysAlis CCD, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
;
_computing_data_reduction
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
;
_computing_molecular_graphics    'PLATON (Spek, 1990)'
_computing_publication_material  'PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR-97 (Altomare, 1999)'
_diffrn_ambient_temperature      123
_diffrn_detector_area_resol_mean 10.5431
_diffrn_measured_fraction_theta_full 0.958
_diffrn_measured_fraction_theta_max 0.958
_diffrn_measurement_device_type  'Oxford Diffraction Gemini Ultra'
_diffrn_measurement_method       omega-scan
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_source         'Enhance (Cu) X-ray Source'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0192
_diffrn_reflns_av_sigmaI/netI    0.0206
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            5373
_diffrn_reflns_reduction_process
;
;
_diffrn_reflns_theta_full        66.65
_diffrn_reflns_theta_max         66.65
_diffrn_reflns_theta_min         3.70
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.828
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.64185
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.389
_exptl_crystal_density_method    'Not Measured'
_exptl_crystal_description       'flat needle'
_exptl_crystal_F_000             800
_exptl_crystal_size_max          0.470
_exptl_crystal_size_mid          0.085
_exptl_crystal_size_min          0.052
_refine_diff_density_max         0.138
_refine_diff_density_min         -0.159
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details 'Flack H.D. (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.06(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.077
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     254
_refine_ls_number_reflns         2679
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.077
_refine_ls_R_factor_all          0.0305
_refine_ls_R_factor_gt           0.0283
_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^)+(0.0455P)^2^+0.1626P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0713
_refine_ls_wR_factor_ref         0.0723
_reflns_number_gt                2512
_reflns_number_total             2679
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            jo901389q_si_002.cif
_cod_data_source_block           h196
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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_database_code               4024945