Addition of Difluorocarbene to 3',4'-Unsaturated Nucleosides: Synthesis of 2'-Deoxy Analogues with a 2-Oxabicyclo[3.1.0]hexane Framework
Ireneusz Nowak; John F. Cannon; Morris J. Robins; Journal of Organic Chemistry 72 (2007) 532–537; doi:10.1021/jo061965p

data_4022632
_publ_section_title
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 Addition of Difluorocarbene to 3',4'-Unsaturated Nucleosides:
 Synthesis of 2'-Deoxy Analogues with a 2-Oxabicyclo[3.1.0]hexane Framework
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_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              532
_journal_page_last               537
_journal_paper_doi               10.1021/jo061965p
_journal_volume                  72
_journal_year                    2007
_chemical_absolute_configuration ad
_chemical_formula_sum            'C10 H10 F2 N2 O4'
_chemical_formula_weight         260.20
_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-97
_cell_angle_alpha                90.00
_cell_angle_beta                 96.388(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.5347(6)
_cell_length_b                   7.0844(7)
_cell_length_c                   11.6550(11)
_cell_measurement_reflns_used    68
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      13.13
_cell_measurement_theta_min      4.74
_cell_volume                     536.21(9)
_computing_cell_refinement       'Bruker XSCANS'
_computing_data_collection       'Bruker XSCANS'
_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      296(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker P4'
_diffrn_measurement_method       '2\q/\w 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  0.0198
_diffrn_reflns_av_sigmaI/netI    0.0314
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       1
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            1522
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         3.14
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.147
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            COLORLESS
_exptl_crystal_density_diffrn    1.612
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       PLATE
_exptl_crystal_F_000             268
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.48
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.133
_refine_diff_density_min         -0.155
_refine_diff_density_rms         0.035
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.3(15)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     168
_refine_ls_number_reflns         1031
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0419
_refine_ls_R_factor_gt           0.0349
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0464P)^2^+0.0670P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0850
_refine_ls_wR_factor_ref         0.0883
_reflns_number_gt                909
_reflns_number_total             1031
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo061965psi20060925_123127.cif
_cod_data_source_block           xl519
_cod_depositor_comments
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The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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_original_sg_symbol_H-M      'P 21'
_cod_database_code               4022632