Synthesis of Enantiomerically Pure 5-Substituted Piperazine-2-Acetic Acid Esters as Intermediates for Library Production.
Jain, Prashi; Raji, Idris O.; Chamakuri, Srinivas; MacKenzie, Kevin R.; Ebright, Brandon T.; Santini, Conrad; Young, Damian W.; The Journal of organic chemistry 84 (2019) 6040–6064; doi:10.1021/acs.joc.9b00148

data_4033674
_publ_section_title
;
 Synthesis of Enantiomerically Pure 5-Substituted Piperazine-2-Acetic Acid
 Esters as Intermediates for Library Production.
;
_journal_issue                   10
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              6040
_journal_page_last               6064
_journal_paper_doi               10.1021/acs.joc.9b00148
_journal_volume                  84
_journal_year                    2019
_chemical_absolute_configuration ad
_chemical_formula_sum            'C15 H21 N3 O6 S'
_chemical_formula_weight         371.41
_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_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.9889(2)
_cell_length_b                   13.9286(3)
_cell_length_c                   15.6096(4)
_cell_measurement_reflns_used    8186
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      66.65
_cell_measurement_theta_min      4.25
_cell_volume                     1736.95(7)
_computing_cell_refinement       'SAINT v7.60A (Bruker-Nonius, 2013)'
_computing_data_collection       'APEX2 v2013.4-1 (Bruker-Nonius, 2013)'
_computing_data_reduction        'SAINT v7.60A (Bruker-Nonius, 2013)'
_computing_structure_refinement  'SHELXL v6.12 (G.M. Sheldrick, 2001)'
_computing_structure_solution    'SHELXS v6.12 (G.M. Sheldrick, 2001)'
_diffrn_ambient_temperature      123(2)
_diffrn_detector_area_resol_mean 4K
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker DUO APEX II CCD'
_diffrn_measurement_method       CCD
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Incoatec 30 Watt Cu microsource'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0268
_diffrn_reflns_av_sigmaI/netI    0.0189
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            11802
_diffrn_reflns_theta_full        66.65
_diffrn_reflns_theta_max         66.65
_diffrn_reflns_theta_min         4.25
_diffrn_standards_decay_%        0.0
_exptl_absorpt_coefficient_mu    1.998
_exptl_absorpt_correction_T_max  0.7528
_exptl_absorpt_correction_T_min  0.6494
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SAINT v7.60A'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.420
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'square column'
_exptl_crystal_F_000             784
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.163
_refine_diff_density_min         -0.196
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.006(11)
_refine_ls_extinction_coef       0.0088(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     231
_refine_ls_number_reflns         3037
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.048
_refine_ls_R_factor_all          0.0212
_refine_ls_R_factor_gt           0.0211
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0274P)^2^+0.4260P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0550
_refine_ls_wR_factor_ref         0.0551
_reflns_number_gt                3026
_reflns_number_total             3054
_reflns_threshold_expression     >3.99sigma(I)
_cod_data_source_file            jo9b00148_si_002.cif
_cod_data_source_block           k1614
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_absorpt_correction_type' value 'Empirical' was
changed to 'empirical' 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 '_symmetry_cell_setting' value 'Orthorhombic' was changed
to 'orthorhombic' 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.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_database_code               4033674