An Efficient Synthetic Approach to 6,5' (<i>S</i>) and 6,5' (<i>R</i>) - Cyclouridine
Christopher S. Theile; Larry W. McLaughlin; Chem.Commun. 48 (2012) 5587–; doi:10.1039/c2cc31597a

data_7107759
_publ_section_title
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 An Efficient Synthetic Approach to 6,5' (<i>S</i>) and 6,5' (<i>R</i>) -
 Cyclouridine
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_journal_name_full               Chem.Commun.
_journal_page_first              5587
_journal_paper_doi               10.1039/c2cc31597a
_journal_volume                  48
_journal_year                    2012
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C12 H14 N2 O6'
_chemical_formula_sum            'C12 H14 N2 O6'
_chemical_formula_weight         282.25
_chemical_melting_point          ?
_space_group_IT_number           5
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 105.512(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.1949(18)
_cell_length_b                   6.3676(10)
_cell_length_c                   18.385(3)
_cell_measurement_reflns_used    5150
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.19
_cell_measurement_theta_min      2.30
_cell_volume                     1262.8(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'Bruker SMART APEX CCD'
_diffrn_measurement_method       '0.3 deg wide \w exposures'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0274
_diffrn_reflns_av_sigmaI/netI    0.0378
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            7524
_diffrn_reflns_theta_full        28.25
_diffrn_reflns_theta_max         28.25
_diffrn_reflns_theta_min         2.30
_exptl_absorpt_coefficient_mu    0.121
_exptl_absorpt_correction_T_max  0.9976
_exptl_absorpt_correction_T_min  0.9845
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.485
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    none
_exptl_crystal_description       block
_exptl_crystal_F_000             592
_exptl_crystal_size_max          0.13
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.379
_refine_diff_density_min         -0.192
_refine_diff_density_rms         0.054
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.8(8)
_refine_ls_extinction_coef       na
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.057
_refine_ls_hydrogen_treatment    refxyz
_refine_ls_matrix_type           full
_refine_ls_number_parameters     223
_refine_ls_number_reflns         3037
_refine_ls_number_restraints     214
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.0421
_refine_ls_R_factor_gt           0.0390
_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^)+(0.0588P)^2^+0.1903P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0952
_refine_ls_wR_factor_ref         0.0972
_reflns_number_gt                2831
_reflns_number_total             3037
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2cc31597a.txt
_cod_data_source_block           C12H14N2O6
_cod_depositor_comments
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The following automatic conversions were performed:

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

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

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

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_cell_volume        1262.9(3)
_cod_original_sg_symbol_H-M      C2
_cod_database_code               7107759