Synthesis of Bicyclic 2'-Deoxynucleosides with α-l-ribo- and β-d-xylo-Configurations and Restricted S- and N-Type Conformations
Khalil I. Shaikh; Surender Kumar; Lene Lundhus; Andrew D. Bond; Pawan K. Sharma; Poul Nielsen; Journal of Organic Chemistry 74 (2009) 1557–1566; doi:10.1021/jo8023472

data_4024332
_publ_contact_author_address
;
 University of Southern Denmark
 Department of Physics and Chemistry
 Campusvej 55
 5230 Odense
 Denmark
;
_publ_contact_author_email       adb@chem.sdu.dk
_publ_contact_author_fax         '+45 6615 8780'
_publ_contact_author_name        'Andrew D. Bond'
_publ_contact_author_phone       '+45 6650 2545'
_publ_section_title
;
Synthesis of Bicyclic 2'-Deoxynucleosides with \a-l-ribo- and
\b-d-xylo-Configurations and Restricted S- and N-Type Conformations
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              1557
_journal_page_last               1566
_journal_paper_doi               10.1021/jo8023472
_journal_volume                  74
_journal_year                    2009
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C20 H24 N2 O6'
_chemical_formula_sum            'C20 H24 N2 O6'
_chemical_formula_weight         388.41
_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 plus manual editing'
_cell_angle_alpha                90.00
_cell_angle_beta                 101.291(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.0568(2)
_cell_length_b                   24.1906(8)
_cell_length_c                   10.8673(4)
_cell_measurement_reflns_used    7676
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      28.23
_cell_measurement_theta_min      2.55
_cell_volume                     1819.23(10)
_computing_cell_refinement       'SAINT v.7.06a (Bruker, 2003)'
_computing_data_collection       'APEX2 v.1.0-22 (Bruker Nonius, 2004)'
_computing_data_reduction        'SAINT v.7.06a'
_computing_molecular_graphics    'SHELXTL v.6.10'
_computing_publication_material  'SHELXTL v.6.10'
_computing_structure_refinement  'SHELXTL v.6.10'
_computing_structure_solution    'SHELXTL v.6.10 (Sheldrick, 2000)'
_diffrn_ambient_temperature      180(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker-Nonius X8APEX-II CCD'
_diffrn_measurement_method       'thin-slice \w and \f 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  0.0229
_diffrn_reflns_av_sigmaI/netI    0.0131
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -32
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            47068
_diffrn_reflns_theta_full        28.36
_diffrn_reflns_theta_max         28.36
_diffrn_reflns_theta_min         3.60
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.105
_exptl_absorpt_correction_T_max  0.969
_exptl_absorpt_correction_T_min  0.885
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 SADABS v.2.10 (Sheldrick, 2003)
 Ratio of minimum to maximum apparent transmission:  0.913581
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.418
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             824
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.260
_refine_diff_density_min         -0.177
_refine_diff_density_rms         0.034
_refine_ls_abs_structure_details
;
 In the absence of significant anomalous scattering effects,
 Friedel pairs (3372 measured) were merged as equivalent data.
;
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     515
_refine_ls_number_reflns         4644
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0305
_refine_ls_R_factor_gt           0.0289
_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^)+(0.0516P)^2^+0.2077P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0766
_refine_ls_wR_factor_ref         0.0773
_reflns_number_gt                4433
_reflns_number_total             4644
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            jo8023472_si_004.cif
_cod_data_source_block           29
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               4024332