Unusual stereoselectivity in the alkylation of pyroglutamate ester urethanes
Charrier, Jean-Damien; Duffy, James E. S.; Hitchcock, Peter B.; Young, Douglas W.; Journal of the Chemical Society, Perkin Transactions 1  (2001) 2367–; doi:10.1039/b106451g

data_7204219
_publ_section_title
;
 Unusual stereoselectivity in the alkylation of pyroglutamate ester
 urethanes
;
_journal_issue                   19
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 1'
_journal_page_first              2367
_journal_paper_doi               10.1039/b106451g
_journal_year                    2001
_chemical_formula_sum            'C20 H33 N O7'
_chemical_formula_weight         399.47
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 94.20(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.634(7)
_cell_length_b                   16.312(6)
_cell_length_c                   11.909(6)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      10
_cell_measurement_theta_min      7
_cell_volume                     1091.5(15)
_computing_cell_refinement       'Enraf-Nonius CAD4'
_computing_data_collection       'Enraf-Nonius CAD4'
_computing_molecular_graphics    'CAMERON (Watkin and Pearce,1993)'
_computing_publication_material  SHELXL-93
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measurement_device       ' Enraf-Nonius CAD4'
_diffrn_measurement_method       \w--2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0607
_diffrn_reflns_av_sigmaI/netI    0.0492
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            2196
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.12
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  120
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_type   none
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_exptl_crystal_F_000             432
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.304
_refine_diff_density_min         -0.444
_refine_diff_density_rms         0.071
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.84(198)
_refine_ls_extinction_coef       0.0018(63)
_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_all   1.095
_refine_ls_goodness_of_fit_obs   1.092
_refine_ls_hydrogen_treatment    riding
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_refine_ls_number_reflns         1997
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_refine_ls_restrained_S_obs      1.092
_refine_ls_R_factor_all          0.0769
_refine_ls_R_factor_obs          0.0603
_refine_ls_shift/esd_max         0.004
_refine_ls_shift/esd_mean        0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1138P)^2^+0.2090P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1694
_refine_ls_wR_factor_obs         0.1514
_reflns_number_observed          1768
_reflns_number_total             1998
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            b106451g.txt
_cod_data_source_block           jun1098
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.1138P)^2^+0.2090P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.1138P)^2^+0.2090P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7204219