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_4033998
_publ_section_title
;
 Synthetic Access to 3-Substituted Pyroglutamic Acids from Tetramate
 Derivatives of Serine, Threonine, <i>allo</i>-Threonine, and Cysteine.
;
_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         'C19 H23 N O5'
_chemical_formula_sum            'C19 H23 N O5'
_chemical_formula_weight         345.40
_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             2017-03-27
_audit_creation_method           CRYSTALS_ver_14.61_build_6156
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   6.04140(10)
_cell_length_b                   18.1188(4)
_cell_length_c                   32.9664(6)
_cell_measurement_reflns_used    9987
_cell_measurement_temperature    150
_cell_measurement_theta_max      76
_cell_measurement_theta_min      5
_cell_volume                     3608.60(12)
_computing_cell_refinement       'CrysAlisPro, (Agilent, 2011)'
_computing_data_collection       'SuperNova, (Oxford Diffraction, 2010)'
_computing_data_reduction        'CrysAlisPro, (Agilent, 2011)'
_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 0.991
_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     1.54184
_diffrn_reflns_av_R_equivalents  0.032
_diffrn_reflns_av_sigmaI/netI    0.0482
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -41
_diffrn_reflns_number            20430
_diffrn_reflns_theta_full        74.836
_diffrn_reflns_theta_max         76.363
_diffrn_reflns_theta_min         3.625
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.757
_exptl_absorpt_correction_T_max  0.96
_exptl_absorpt_correction_T_min  0.72
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrysAlisPro, (Agilent, 2011)'
_exptl_crystal_colour            clear_pale_colourless
_exptl_crystal_density_diffrn    1.271
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1472
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.17
_refine_diff_density_min         -0.12
_refine_ls_abs_structure_details 'Flack (1983), 3167 Friedel-pairs'
_refine_ls_abs_structure_Flack   -0.04(11)
_refine_ls_extinction_coef       51(2)
_refine_ls_extinction_method     'Larson (1970), Equation 22'
_refine_ls_goodness_of_fit_ref   0.9999
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     453
_refine_ls_number_reflns         5964
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0285
_refine_ls_R_factor_gt           0.0268
_refine_ls_shift/su_max          0.0011000
_refine_ls_shift/su_mean         0.0001054
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982) 
 [weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)] 
 where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax 
 Method = Robust Weighting (Prince, 1982) 
 W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^ 
 A~i~ are: 
 0.140E+04 0.226E+04 0.141E+04 590. 122. 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0622
_refine_ls_wR_factor_gt          0.0604
_refine_ls_wR_factor_ref         0.0621
_reflns_limit_h_max              7
_reflns_limit_h_min              -7
_reflns_limit_k_max              22
_reflns_limit_k_min              0
_reflns_limit_l_max              41
_reflns_limit_l_min              0
_reflns_number_gt                5722
_reflns_number_total             7470
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   2.53
_oxford_diffrn_Wilson_scale      0.02
_oxford_refine_ls_r_factor_ref   0.0284
_oxford_refine_ls_scale          5.31(5)
_oxford_reflns_number_all        5965
_oxford_reflns_threshold_expression_ref I>-3.0\s(I)
_oxford_structure_analysis_title 6728
_cod_data_source_file            jo9b01432_si_002.cif
_cod_data_source_block           6ai
_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 
;
_cod_original_sg_symbol_H-M      'P 21 21 21 '
_cod_database_code               4033998