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_4024330
_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         'C13 H18 N2 O6'
_chemical_formula_sum            'C13 H18 N2 O6'
_chemical_formula_weight         298.29
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.6368(3)
_cell_length_b                   9.9471(5)
_cell_length_c                   19.9623(11)
_cell_measurement_reflns_used    8817
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      27.84
_cell_measurement_theta_min      2.89
_cell_volume                     1317.85(11)
_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 0.988
_diffrn_measured_fraction_theta_max 0.988
_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  0.0303
_diffrn_reflns_av_sigmaI/netI    0.0180
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            19853
_diffrn_reflns_theta_full        28.27
_diffrn_reflns_theta_max         28.27
_diffrn_reflns_theta_min         3.68
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.120
_exptl_absorpt_correction_T_max  0.976
_exptl_absorpt_correction_T_min  0.891
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 SADABS v.2.10 (Sheldrick, 2003)
 Ratio of minimum to maximum apparent transmission:  0.913068
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.503
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             632
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.274
_refine_diff_density_min         -0.249
_refine_diff_density_rms         0.048
_refine_ls_abs_structure_details
;
 Absolute structure assigned by chemist.
 Friedel pairs (1339 measured) merged as equivalent data.
;
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     199
_refine_ls_number_reflns         1868
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0336
_refine_ls_R_factor_gt           0.0304
_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^)+(0.0574P)^2^+0.1063P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0812
_refine_ls_wR_factor_ref         0.0824
_reflns_number_gt                1725
_reflns_number_total             1868
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            jo8023472_si_002.cif
_cod_data_source_block           8
_cod_database_code               4024330