Synthetic Access to 3-Substituted Pyroglutamic Acids from Tetramate Derivatives of Serine, Threonine, <i>allo</i>-Threonine, and Cysteine.
Bagum, Halima; Christensen, Kirsten E.; Genov, Miroslav; Pretsch, Alexander; Pretsch, Dagmar; Moloney, Mark G.; The Journal of organic chemistry 84 (2019) 10257–10279; doi:10.1021/acs.joc.9b01432

data_4033996
_publ_section_title
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 Synthetic Access to 3-Substituted Pyroglutamic Acids from Tetramate
 Derivatives of Serine, Threonine, <i>allo</i>-Threonine, and Cysteine.
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_journal_issue                   16
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              10257
_journal_page_last               10279
_journal_paper_doi               10.1021/acs.joc.9b01432
_journal_volume                  84
_journal_year                    2019
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C14 H21 N O7 S'
_chemical_formula_sum            'C14 H21 N O7 S'
_chemical_formula_weight         347.39
_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     other
_audit_creation_date             2016-10-03
_audit_creation_method           CRYSTALS_ver_14.43
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.7353(3)
_cell_length_b                   12.3699(4)
_cell_length_c                   17.0299(6)
_cell_measurement_reflns_used    10253
_cell_measurement_temperature    150
_cell_measurement_theta_max      30
_cell_measurement_theta_min      4
_cell_volume                     1629.50(10)
_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    'Superflip (Palatinus & Chapuis, 2007)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.947
_diffrn_measurement_device       Area
_diffrn_measurement_device_type  'Oxford Diffraction SuperNova'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.035
_diffrn_reflns_av_sigmaI/netI    0.0453
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            22869
_diffrn_reflns_theta_full        25.101
_diffrn_reflns_theta_max         30.610
_diffrn_reflns_theta_min         3.329
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.234
_exptl_absorpt_correction_T_max  0.94
_exptl_absorpt_correction_T_min  0.79
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrysAlis, (Oxford Diffraction, 2002)'
_exptl_crystal_colour            clear_pale_colourless
_exptl_crystal_density_diffrn    1.416
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             736
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.20
_refine_diff_density_min         -0.24
_refine_ls_abs_structure_details 'Flack (1983), 1903 Friedel-pairs'
_refine_ls_abs_structure_Flack   0.00(6)
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.0122
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     209
_refine_ls_number_reflns         2675
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0242
_refine_ls_R_factor_gt           0.0235
_refine_ls_shift/su_max          0.0002406
_refine_ls_shift/su_mean         0.0000293
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 Method= Modified Sheldrick 
 w=1/[\s^2^(F^2^) + ( 0.03P)^2^ + 0.46P] 
 ,where P=(max(Fo^2^,0) + 2Fc^2^)/3 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0593
_refine_ls_wR_factor_gt          0.0588
_refine_ls_wR_factor_ref         0.0593
_reflns_limit_h_max              10
_reflns_limit_h_min              -10
_reflns_limit_k_max              17
_reflns_limit_k_min              0
_reflns_limit_l_max              24
_reflns_limit_l_min              0
_reflns_number_gt                2600
_reflns_number_total             4599
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   1.98
_oxford_diffrn_Wilson_scale      0.03
_oxford_refine_ls_r_factor_ref   0.0242
_oxford_refine_ls_scale          6.23(10)
_oxford_reflns_number_all        2675
_oxford_reflns_threshold_expression_ref I>-3.0\s(I)
_oxford_structure_analysis_title 6661
_iucr_refine_instructions_details_constraints
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BLOCK SCALE X'S, U'S 
CONT ENANTIO 
RIDE C   (   2,X'S) H   (  21,X'S) 
RIDE C   (   4,X'S) H   (  41,X'S) 
RIDE C   (   7,X'S) H   (  71,X'S) 
RIDE C   (  10,X'S) H   ( 102,X'S) H   ( 101,X'S) H   ( 103,X'S) 
RIDE C   (  11,X'S) H   ( 113,X'S) H   ( 111,X'S) H   ( 112,X'S) 
RIDE C   (  12,X'S) H   ( 121,X'S) H   ( 122,X'S) H   ( 123,X'S) 
RIDE C   (  16,X'S) H   ( 162,X'S) H   ( 163,X'S) H   ( 161,X'S) 
RIDE C   (  21,X'S) H   ( 213,X'S) H   ( 212,X'S) H   ( 211,X'S) 
RIDE C   (  22,X'S) H   ( 223,X'S) H   ( 222,X'S) H   ( 221,X'S) 
END                                                                             
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_iucr_refine_instructions_details_restraints
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NO 
REM   HREST   START (DO NOT REMOVE THIS LINE) 
REM   HREST   END (DO NOT REMOVE THIS LINE) 
END                                                                             
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_cod_data_source_file            jo9b01432_si_002.cif
_cod_data_source_block           5c
_cod_depositor_comments
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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 '_atom_sites_solution_primary' value 'Other' was changed to
'other' in accordance with the
/home/data/users/saulius/crontab/automatic-downloads/current/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

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 
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_cod_original_cell_volume        1629.5(1)
_cod_original_sg_symbol_H-M      'P 21 21 21 '
_cod_database_code               4033996