Stereocontrolled Alkylative Construction of Quaternary Carbon Centers
David A. Kummer; William J. Chain; Marvin R. Morales; Olga Quiroga; Andrew G. Myers; Journal of the American Chemical Society 130 (2008) 13231–13233; doi:10.1021/ja806021y

data_4108443
_publ_section_title
;
 Stereocontrolled Alkylative Construction of Quaternary Carbon Centers
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              13231
_journal_page_last               13233
_journal_paper_doi               10.1021/ja806021y
_journal_volume                  130
_journal_year                    2008
_chemical_formula_sum            'C28 H36 Br N O3'
_chemical_formula_weight         514.49
_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                   6.0539(18)
_cell_length_b                   18.545(6)
_cell_length_c                   23.851(6)
_cell_measurement_reflns_used    842
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      22.82
_cell_measurement_theta_min      2.20
_cell_volume                     2677.7(14)
_computing_cell_refinement       'SMART (BRUKER, V5.625, 2001)'
_computing_data_collection       'ASTRO (BRUKER, V5.007, 1997)'
_computing_data_reduction        'SAINT (BRUKER, V6.22, 2001)'
_computing_molecular_graphics    'SHELXTL (BRUKER, 2000, V6.1)'
_computing_publication_material  'XCIF (Sheldrick and BRUKER, 1997, V5.1)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      193(2)
_diffrn_detector_area_resol_mean 836.6
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker CCD'
_diffrn_measurement_method       '\w, 0.3 deg'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0626
_diffrn_reflns_av_sigmaI/netI    0.0887
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            18590
_diffrn_reflns_theta_full        27.93
_diffrn_reflns_theta_max         27.93
_diffrn_reflns_theta_min         1.39
_diffrn_standards_decay_%        <1
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.563
_exptl_absorpt_correction_T_max  0.8852
_exptl_absorpt_correction_T_min  0.7452
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.276
_exptl_crystal_description       needle
_exptl_crystal_F_000             1080
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.492
_refine_diff_density_min         -0.321
_refine_diff_density_rms         0.062
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.010(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.990
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     304
_refine_ls_number_reflns         6394
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.990
_refine_ls_R_factor_all          0.0934
_refine_ls_R_factor_gt           0.0536
_refine_ls_shift/su_max          0.032
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0508P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1087
_refine_ls_wR_factor_ref         0.1239
_reflns_number_gt                4320
_reflns_number_total             6394
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja806021y_si_003.cif
_cod_data_source_block           agm56t
_cod_original_cell_volume        2677.7(13)
_cod_database_code               4108443