Radical Reactions with Double Memory of Chirality (2MOC) for the Enantiospecific Synthesis of Adjacent Stereogenic Quaternary Centers in Solution: Cleavage and Bonding Faster than Radical Rotation
Marino J. E. Resendiz; Farnosh Family; Kerrian Fuller; Luis M. Campos; Saeed I. Khan; Natalia V. Lebedeva; Malcolm D. E. Forbes; Miguel A. Garcia-Garibay; Journal of the American Chemical Society 131 (2009) 8425–8433; doi:10.1021/ja900781n

data_4104550
_publ_section_title
;
 Radical Reactions with Double Memory of Chirality (2MOC) for the
 Enantiospecific Synthesis of Adjacent Stereogenic Quaternary Centers in
 Solution: Cleavage and Bonding Faster than Radical Rotation
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              8425
_journal_page_last               8433
_journal_paper_doi               10.1021/ja900781n
_journal_volume                  131
_journal_year                    2009
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C23 H24 N2 O3'
_chemical_formula_sum            'C23 H24 N2 O3'
_chemical_formula_weight         376.44
_space_group_IT_number           92
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4abw 2nw'
_symmetry_space_group_name_H-M   'P 41 21 2'
_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                   6.8604(13)
_cell_length_b                   6.8604(13)
_cell_length_c                   40.242(11)
_cell_measurement_reflns_used    3777
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      23.96
_cell_measurement_theta_min      3.90
_cell_volume                     1894.0(7)
_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      110(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_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  0.0581
_diffrn_reflns_av_sigmaI/netI    0.0279
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       53
_diffrn_reflns_limit_l_min       -51
_diffrn_reflns_number            16517
_diffrn_reflns_theta_full        28.32
_diffrn_reflns_theta_max         28.32
_diffrn_reflns_theta_min         3.90
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  0.9913
_exptl_absorpt_correction_T_min  0.9417
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'sadabs (Bruker)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.320
_exptl_crystal_description       block
_exptl_crystal_F_000             800
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.244
_refine_diff_density_min         -0.229
_refine_diff_density_rms         0.053
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.289
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     129
_refine_ls_number_reflns         1497
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.289
_refine_ls_R_factor_all          0.0635
_refine_ls_R_factor_gt           0.0591
_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^)+(0.0277P)^2^+1.8880P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1324
_refine_ls_wR_factor_ref         0.1339
_reflns_number_gt                1398
_reflns_number_total             1497
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja900781n_si_003.cif
_cod_data_source_block           p41212
_cod_database_code               4104550