Tandem Reactions Leading to Bicyclic Pyrimidine Nucleosides and Benzopyran-4-ones
Xuesen Fan; Yangyang Wang; Yingying Qu; Haiyun Xu; Yan He; Xinying Zhang; Jianji Wang; Journal of Organic Chemistry 76 (2011) 982–985; doi:10.1021/jo102131y

data_4026012
_publ_section_title
;
 Tandem Reactions Leading to Bicyclic Pyrimidine Nucleosides and
 Benzopyran-4-ones
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              982
_journal_page_last               985
_journal_paper_doi               10.1021/jo102131y
_journal_volume                  76
_journal_year                    2011
_chemical_absolute_configuration rm
_chemical_formula_sum            'C17 H18 N2 O8'
_chemical_formula_weight         378.33
_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                 100.8210(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.4955(10)
_cell_length_b                   6.7112(7)
_cell_length_c                   13.9717(15)
_cell_measurement_reflns_used    3612
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      28.20
_cell_measurement_theta_min      2.40
_cell_volume                     874.53(16)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_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  '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  0.0137
_diffrn_reflns_av_sigmaI/netI    0.0181
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6673
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.40
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.116
_exptl_absorpt_correction_T_max  0.9552
_exptl_absorpt_correction_T_min  0.9444
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.437
_exptl_crystal_description       block
_exptl_crystal_F_000             396
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.116
_refine_diff_density_min         -0.141
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.5(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     247
_refine_ls_number_reflns         3111
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0332
_refine_ls_R_factor_gt           0.0303
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0476P)^2^+0.0667P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0793
_refine_ls_wR_factor_ref         0.0818
_reflns_number_gt                2878
_reflns_number_total             3111
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo102131y_si_001.cif
_cod_data_source_block           a
_cod_database_code               4026012