Regioselective and Asymmetric Diels-Alder Reaction of 1- and 2-Substituted Cyclopentadienes Catalyzed by a Brønsted Acid Activated Chiral Oxazaborolidine
Joshua N. Payette; Hisashi Yamamoto; Journal of the American Chemical Society 129 (2007) 9536–9537; doi:10.1021/ja0735958

data_4109753
_publ_section_title
;
 Regioselective and Asymmetric Diels-Alder Reaction of 1- and
 2-Substituted Cyclopentadienes Catalyzed by a Br\/onsted Acid Activated
 Chiral Oxazaborolidine
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              9536
_journal_page_last               9537
_journal_paper_doi               10.1021/ja0735958
_journal_volume                  129
_journal_year                    2007
_chemical_formula_sum            'C16 H17 Br O3'
_chemical_formula_weight         337.21
_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                   6.5293(16)
_cell_length_b                   8.022(2)
_cell_length_c                   27.132(7)
_cell_measurement_temperature    100(2)
_cell_volume                     1421.1(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.973
_diffrn_measured_fraction_theta_max 0.973
_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  0.0534
_diffrn_reflns_av_sigmaI/netI    0.0643
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -35
_diffrn_reflns_number            16691
_diffrn_reflns_theta_full        28.31
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.50
_exptl_absorpt_coefficient_mu    2.897
_exptl_absorpt_correction_T_max  0.9181
_exptl_absorpt_correction_T_min  0.3904
_exptl_crystal_density_diffrn    1.576
_exptl_crystal_F_000             688
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.489
_refine_diff_density_min         -0.313
_refine_diff_density_rms         0.070
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.005(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.886
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     183
_refine_ls_number_reflns         3377
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.886
_refine_ls_R_factor_all          0.0439
_refine_ls_R_factor_gt           0.0319
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0250P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0574
_refine_ls_wR_factor_ref         0.0592
_reflns_number_gt                2704
_reflns_number_total             3377
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja0735958si20070523_111424.cif
_cod_data_source_block           josh06s
_cod_original_cell_volume        1421.2(6)
_cod_database_code               4109753