Diels-Alder reactions of cyclic isoimidium salts.
Boeckman, Jr, Robert K; Miller, Yan; Ryder, Todd R.; Organic letters 12 (2010) 4524–4527; doi:10.1021/ol101831b

data_1556120
_publ_section_title
;
 Diels-Alder reactions of cyclic isoimidium salts.
;
_journal_issue                   20
_journal_name_full               'Organic letters'
_journal_page_first              4524
_journal_page_last               4527
_journal_paper_doi               10.1021/ol101831b
_journal_volume                  12
_journal_year                    2010
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C20 H19 N O3'
_chemical_formula_sum            'C20 H19 N O3'
_chemical_formula_weight         321.36
_chemical_name_common            boeyz03
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_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                   8.715(2)
_cell_length_b                   9.891(2)
_cell_length_c                   19.206(5)
_cell_measurement_reflns_used    4005
_cell_measurement_temperature    100.0(1)
_cell_measurement_theta_max      32.49
_cell_measurement_theta_min      2.32
_cell_volume                     1655.6(7)
_computing_cell_refinement       'SAINT (Bruker, 2006)'
_computing_data_collection       'APEX2 (Bruker, 2006)'
_computing_data_reduction        'SAINT (Bruker, 2006)'
_computing_molecular_graphics    'SHELXTL (Bruker, 2000)'
_computing_publication_material  'SHELXTL (Bruker, 2000)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100.0(1)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker SMART APEX II CCD Platform'
_diffrn_measurement_method       'area detector, \w scans per \f'
_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  0.0404
_diffrn_reflns_av_sigmaI/netI    0.0232
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            27711
_diffrn_reflns_theta_full        32.57
_diffrn_reflns_theta_max         32.57
_diffrn_reflns_theta_min         2.12
_exptl_absorpt_coefficient_mu    0.087
_exptl_absorpt_correction_T_max  0.9863
_exptl_absorpt_correction_T_min  0.9728
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2007)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.289
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.295
_refine_diff_density_min         -0.179
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     293
_refine_ls_number_reflns         3387
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0460
_refine_ls_R_factor_gt           0.0368
_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^)+(0.0592P)^2^+0.1376P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0904
_refine_ls_wR_factor_ref         0.0956
_reflns_number_gt                2953
_reflns_number_total             3387
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol101831b_si_006.cif
_cod_data_source_block           boeyz03
_cod_database_code               1556120