Triflimide Activation of a Chiral Oxazaborolidine Leads to a More General Catalytic System for Enantioselective Diels-Alder Addition
Do Hyun Ryu; E. J. Corey; Journal of the American Chemical Society 125 (2003) 6388–6390; doi:10.1021/ja035393r

data_4113769
_publ_section_title
;
 Triflimide Activation of a Chiral Oxazaborolidine Leads to a More General
 Catalytic System for Enantioselective Diels-Alder Addition
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              6388
_journal_page_last               6390
_journal_paper_doi               10.1021/ja035393r
_journal_volume                  125
_journal_year                    2003
_chemical_formula_sum            'C12 H13 I O3'
_chemical_formula_weight         332.12
_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                 100.454(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.2413(11)
_cell_length_b                   6.7008(8)
_cell_length_c                   19.746(2)
_cell_measurement_reflns_used    312
_cell_measurement_temperature    213(2)
_cell_measurement_theta_max      27.23
_cell_measurement_theta_min      2.35
_cell_volume                     1202.5(2)
_computing_cell_refinement       'SMART (BRUKER, V5.054, 1998)'
_computing_data_collection       'ASTRO (BRUKER, V5.007, 1997)'
_computing_data_reduction        'SAINT (BRUKER, V6.01, 1999)'
_computing_molecular_graphics    'SHELXTL (BRUKER, 1998, V5.1)'
_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      213(2)
_diffrn_detector_area_resol_mean 836.6
_diffrn_measured_fraction_theta_full 0.971
_diffrn_measured_fraction_theta_max 0.971
_diffrn_measurement_method       '\w, 0.3 deg'
_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  0.0317
_diffrn_reflns_av_sigmaI/netI    0.0261
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            7950
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         1.05
_diffrn_standards_decay_%        <1
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    2.652
_exptl_absorpt_correction_T_max  0.8571
_exptl_absorpt_correction_T_min  0.7414
_exptl_absorpt_correction_type   'semi-empirical, SADABS'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.835
_exptl_crystal_description       needle
_exptl_crystal_F_000             648
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.06
_refine_diff_density_max         1.120
_refine_diff_density_min         -0.751
_refine_diff_density_rms         0.099
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.02(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     289
_refine_ls_number_reflns         4785
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          0.0356
_refine_ls_R_factor_gt           0.0342
_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^)+(0.0557P)^2^+1.7055P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0895
_refine_ls_wR_factor_ref         0.0905
_reflns_number_gt                4625
_reflns_number_total             4785
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja035393rsi20030331_043824.cif
_cod_data_source_block           ejc39t
_cod_database_code               4113769