Diastereoselective Tin-Free Tandem Radical Additions to 3-Formylchromones
Jake R. Zimmerman; Madhuri Manpadi; Russell Spatney; Aaron Baker; Journal of Organic Chemistry 76 (2011) 8076–8081; doi:10.1021/jo201350w

data_4026624
_publ_contact_author_email       staples@chemistry.msu.com
_publ_contact_author_name        'Richard Staples'
_publ_section_title
;
 Diastereoselective Tin-Free Tandem Radical Additions to 3-Formylchromones
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              8076
_journal_page_last               8081
_journal_paper_doi               10.1021/jo201350w
_journal_volume                  76
_journal_year                    2011
_chemical_formula_moiety         'C20 H30 O3'
_chemical_formula_sum            'C20 H30 O3'
_chemical_formula_weight         318.44
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 112.708(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.047(2)
_cell_length_b                   17.143(4)
_cell_length_c                   11.731(3)
_cell_measurement_reflns_used    5870
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.24
_cell_measurement_theta_min      2.20
_cell_volume                     1863.9(7)
_computing_cell_refinement       'APEX2 (BRUKER, V2008.5-0, 2006)'
_computing_data_collection       'COSMO (BRUKER, V1.58, 2006)'
_computing_data_reduction        'SAINT (BRUKER, V7.34A, 2006)'
_computing_molecular_graphics
'SHELXTL (Sheldrick, Acta Cryst. A64 2008, 112-122)'
_computing_publication_material
'SHELXTL (Sheldrick, Acta Cryst. A64 2008, 112-122)'
_computing_structure_refinement
'SHELXL (Sheldrick, Acta Cryst. A64 2008, 112-122)'
_computing_structure_solution
'SHELXS (Sheldrick, Acta Cryst. A64 2008, 112-122)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 836.6
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w,and/f 0.5 deg'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0389
_diffrn_reflns_av_sigmaI/netI    0.0313
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            15888
_diffrn_reflns_theta_full        25.24
_diffrn_reflns_theta_max         25.24
_diffrn_reflns_theta_min         2.20
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  0.9940
_exptl_absorpt_correction_T_min  0.9758
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.135
_exptl_crystal_description       needle
_exptl_crystal_F_000             696
_exptl_crystal_size_max          0.33
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.168
_refine_diff_density_min         -0.189
_refine_diff_density_rms         0.033
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     216
_refine_ls_number_reflns         3350
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0577
_refine_ls_R_factor_gt           0.0390
_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^)+(0.0397P)^2^+0.4737P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0888
_refine_ls_wR_factor_ref         0.0989
_reflns_number_gt                2504
_reflns_number_total             3350
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo201350w_si_001.cif
_cod_data_source_block           jz111_0m
_cod_original_cell_volume        1864.0(7)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4026624