3-Deoxy-3,3-difluoro-D-arabinofuranose: First Stereoselective Synthesis and Application in Preparation of gem-Difluorinated Sugar Nucleosides
Xingang Zhang; Hairong Xia; XiCheng Dong; Jing Jin; Wei-Dong Meng; Feng-Ling Qing; Journal of Organic Chemistry 68 (2003) 9026–9033; doi:10.1021/jo034512i

data_4022478
_publ_section_title
;
 3-Deoxy-3,3-difluoro-D-arabinofuranose: First Stereoselective
 Synthesis and Application in Preparation of
 gem-Difluorinated Sugar Nucleosides
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              9026
_journal_page_last               9033
_journal_paper_doi               10.1021/jo034512i
_journal_volume                  68
_journal_year                    2003
_chemical_formula_sum            'C9 H11 F2 N3 O4'
_chemical_formula_weight         263.21
_chemical_name_systematic
;
  ?
;
_space_group_IT_number           18
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2 2ab'
_symmetry_space_group_name_H-M   'P 21 21 2'
_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                   7.9175(8)
_cell_length_b                   19.677(2)
_cell_length_c                   6.9300(7)
_cell_measurement_reflns_used    1405
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      40.687
_cell_measurement_theta_min      5.879
_cell_volume                     1079.67(19)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.950
_diffrn_measured_fraction_theta_max 0.950
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0439
_diffrn_reflns_av_sigmaI/netI    0.0714
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            6492
_diffrn_reflns_theta_full        28.24
_diffrn_reflns_theta_max         28.24
_diffrn_reflns_theta_min         2.07
_exptl_absorpt_coefficient_mu    0.149
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.74740
_exptl_absorpt_correction_type   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.619
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             544
_exptl_crystal_size_max          0.469
_exptl_crystal_size_mid          0.205
_exptl_crystal_size_min          0.189
_refine_diff_density_max         0.248
_refine_diff_density_min         -0.220
_refine_diff_density_rms         0.037
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.7(10)
_refine_ls_extinction_coef       0.0059(13)
_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   0.865
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     210
_refine_ls_number_reflns         2463
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.865
_refine_ls_R_factor_all          0.0680
_refine_ls_R_factor_gt           0.0391
_refine_ls_shift/su_max          0.019
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0212P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0609
_refine_ls_wR_factor_ref         0.0663
_reflns_number_gt                1607
_reflns_number_total             2463
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo034512isi20030422_041119.cif
_cod_data_source_block           cd22398
_cod_depositor_comments
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The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
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_cod_database_code               4022478