Structure and Synthesis of 6-(Substituted-imidazol-1-yl)purines: Versatile Substrates for Regiospecific Alkylation and Glycosylation at N9
Minghong Zhong; Ireneusz Nowak; John F. Cannon; Morris J. Robins; Journal of Organic Chemistry 71 (2006) 4216–4221; doi:10.1021/jo060340o

data_4021707
_publ_contact_author_address
;Department of Chemistry and Biochemistry
Brigham Young University
Provo, Utah 84602-5700
USA
;
_publ_contact_author_email       morris_robins@byu.edu
_publ_contact_author_fax         '01 (801) 4220153'
_publ_contact_author_name        'Morris J. Robins'
_publ_contact_author_phone       '01 (801) 4226272'
_publ_section_title
;
 Structure and Synthesis of 6-(Substituted-imidazol-1-yl)purines:
 Versatile Substrates for Regiospecific Alkylation and
 Glycosylation at N9
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              4216
_journal_page_last               4221
_journal_paper_doi               10.1021/jo060340o
_journal_volume                  71
_journal_year                    2006
_chemical_absolute_configuration ad
_chemical_formula_sum            'C22 H32 I N5 O2 Si'
_chemical_formula_weight         553.52
_chemical_name_systematic
; 
 9-(5-O-tert-butyldimethylsilyl-2,3-dideoxy-3-iodo-
  \b-D-threo-pentofuranosyl)-6-(2,5-dimethylpyrrol-1-yl)purine
;
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.9025(17)
_cell_length_b                   13.0570(15)
_cell_length_c                   19.969(2)
_cell_measurement_reflns_used    43
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      10.40
_cell_measurement_theta_min      4.82
_cell_volume                     2582.0(6)
_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 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.0297
_diffrn_reflns_av_sigmaI/netI    0.0878
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       1
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            3332
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         2.30
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    1.313
_exptl_absorpt_correction_T_max  0.7143
_exptl_absorpt_correction_T_min  0.6812
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS; Sheldrick, 2003'
_exptl_crystal_colour            COLORLESS
_exptl_crystal_density_diffrn    1.424
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       NEEDLE
_exptl_crystal_F_000             1128
_exptl_crystal_size_max          0.52
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.288
_refine_diff_density_min         -0.345
_refine_diff_density_rms         0.071
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.06(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.981
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     287
_refine_ls_number_reflns         3137
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.981
_refine_ls_R_factor_all          0.0942
_refine_ls_R_factor_gt           0.0488
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0137P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0743
_refine_ls_wR_factor_ref         0.0863
_reflns_number_gt                2022
_reflns_number_total             3137
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo060340osi20060222_024801.cif
_cod_depositor_comments
;
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 
;
_cod_database_code               4021707