Diastereoselective intramolecular aldol ring closures of threonine derivatives leading to densely functionalised pyroglutamates related to oxazolomycin
Heaviside, Elizabeth A.; Moloney, Mark G.; Thompson, Amber L.; RSC Adv. 4 (2014) 16233–; doi:10.1039/C4RA01967A

data_7235592
_publ_section_title
;
 Diastereoselective intramolecular aldol ring closures of threonine
 derivatives leading to densely functionalised pyroglutamates related to
 oxazolomycin
;
_journal_issue                   31
_journal_name_full               'RSC Adv.'
_journal_page_first              16233
_journal_paper_doi               10.1039/C4RA01967A
_journal_volume                  4
_journal_year                    2014
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C23 H33 N1 O6'
_chemical_formula_sum            'C23 H33 N O6'
_chemical_formula_weight         419.52
_chemical_melting_point          ?
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_audit_creation_date             12-04-20
_audit_creation_method           CRYSTALS_ver_14.40
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.1567(1)
_cell_length_b                   13.7873(1)
_cell_length_c                   17.7687(2)
_cell_measurement_reflns_used    32754
_cell_measurement_temperature    150
_cell_measurement_theta_max      76
_cell_measurement_theta_min      3
_cell_volume                     2243.23(4)
_computing_cell_refinement       'CrysAlis, (Oxford Diffraction, 2002)'
_computing_data_collection       'SuperNova, (Oxford Diffraction, 2010)'
_computing_data_reduction        'CrysAlis, (Oxford Diffraction, 2002)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       Area
_diffrn_measurement_device_type  'Oxford Diffraction SuperNova'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54180
_diffrn_reflns_av_R_equivalents  0.035
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            55832
_diffrn_reflns_theta_full        76.585
_diffrn_reflns_theta_max         76.585
_diffrn_reflns_theta_min         4.058
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.729
_exptl_absorpt_correction_T_max  0.93
_exptl_absorpt_correction_T_min  0.57
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrysAlis, (Oxford Diffraction, 2002)'
_exptl_crystal_colour            clear_pale_colourless
_exptl_crystal_density_diffrn    1.242
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             904
_exptl_crystal_size_max          1.00
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.17
_refine_diff_density_min         -0.19
_refine_ls_abs_structure_details 'Flack (1983), 2030 Friedel-pairs'
_refine_ls_abs_structure_Flack   0.06(11)
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   0.9939
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     272
_refine_ls_number_reflns         4709
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0286
_refine_ls_R_factor_gt           0.0280
_refine_ls_shift/su_max          0.0003526
_refine_ls_shift/su_mean         0.0000482
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 Method= Modified Sheldrick 
 w=1/[\s^2^(F^2^) + ( 0.04P)^2^ + 0.46P] 
 ,where P=(max(Fo^2^,0) + 2Fc^2^)/3 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0745
_refine_ls_wR_factor_gt          0.0735
_refine_ls_wR_factor_ref         0.0744
_reflns_limit_h_max              11
_reflns_limit_h_min              -11
_reflns_limit_k_max              17
_reflns_limit_k_min              0
_reflns_limit_l_max              22
_reflns_limit_l_min              0
_reflns_number_gt                4604
_reflns_number_total             4712
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   2.26
_oxford_diffrn_Wilson_scale      0.03
_oxford_refine_ls_r_factor_ref   0.0286
_oxford_refine_ls_scale          6.003
_oxford_reflns_number_all        4710
_oxford_reflns_threshold_expression_ref I>-3.0\s(I)
_oxford_structure_analysis_title 6326
_cod_data_source_file            c4ra01967a2.cif
_cod_data_source_block           6326
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_chemical_melting_point' value 'not measured' was changed
to '?' -- the value is undefined or not given.

data item '_exptl_crystal_density_meas' value 'not measured' was
changed to '?' -- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      'P 21 21 21 '
_cod_original_formula_sum        'C23 H33 N1 O6'
_cod_database_code               7235592