The Role of Achiral Pyrazolidinone Templates in Enantioselective Diels-Alder Reactions: Scope, Limitations, and Conformational Insights
Mukund P. Sibi; Levi M. Stanley; Xiaoping Nie; Lakshmanan Venkatraman; Mei Liu; Craig P. Jasperse; Journal of the American Chemical Society 129 (2007) 395–405; doi:10.1021/ja066425o

data_4108971
_publ_section_title
;
 The Role of Achiral Pyrazolidinone Templates in Enantioselective
 Diels-Alder Reactions: Scope, Limitations, and Conformational Insights
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              395
_journal_page_last               405
_journal_paper_doi               10.1021/ja066425o
_journal_volume                  129
_journal_year                    2007
_chemical_formula_sum            'C20 H22 N2 O2'
_chemical_formula_weight         322.40
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 112.21(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.418(2)
_cell_length_b                   22.807(5)
_cell_length_c                   7.8760(16)
_cell_measurement_temperature    293(2)
_cell_volume                     1732.5(7)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.909
_diffrn_measured_fraction_theta_max 0.909
_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  0.0857
_diffrn_reflns_av_sigmaI/netI    0.1196
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -28
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            13794
_diffrn_reflns_theta_full        27.80
_diffrn_reflns_theta_max         27.80
_diffrn_reflns_theta_min         2.11
_exptl_absorpt_coefficient_mu    0.080
_exptl_crystal_density_diffrn    1.236
_exptl_crystal_F_000             688
_refine_diff_density_max         0.160
_refine_diff_density_min         -0.148
_refine_diff_density_rms         0.035
_refine_ls_extinction_coef       0.0077(9)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.916
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     285
_refine_ls_number_reflns         3728
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.916
_refine_ls_R_factor_all          0.1877
_refine_ls_R_factor_gt           0.0492
_refine_ls_shift/su_max          1.355
_refine_ls_shift/su_mean         0.320
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0228P)^2^+0.9688P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0872
_refine_ls_wR_factor_ref         0.1226
_reflns_number_gt                1485
_reflns_number_total             3728
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja066425osi20060905_053204.cif
_cod_data_source_block           ma1_58
_cod_original_cell_volume        1732.6(6)
_cod_database_code               4108971