Dynamic kinetic asymmetric synthesis of five contiguous stereogenic centers by sequential organocatalytic stetter and Michael-aldol reaction: enantioselective synthesis of fully substituted cyclopentanols bearing a quaternary stereocenter.
Hong, Bor-Cherng; Dange, Nitin S.; Hsu, Che-Sheng; Liao, Ju-Hsiou; Lee, Gene-Hsiang; Organic letters 13 (2011) 1338–1341; doi:10.1021/ol200006e

data_1501988
_publ_section_title
;
 Dynamic kinetic asymmetric synthesis of five contiguous stereogenic
 centers by sequential organocatalytic stetter and Michael-aldol reaction:
 enantioselective synthesis of fully substituted cyclopentanols bearing a
 quaternary stereocenter.
;
_journal_issue                   6
_journal_name_full               'Organic letters'
_journal_page_first              1338
_journal_page_last               1341
_journal_paper_doi               10.1021/ol200006e
_journal_volume                  13
_journal_year                    2011
_chemical_absolute_configuration unk
_chemical_formula_sum            'C23 H25 Br N2 O4'
_chemical_formula_weight         473.36
_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                   5.8869(4)
_cell_length_b                   12.4397(9)
_cell_length_c                   30.019(2)
_cell_measurement_reflns_used    999
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      23.529
_cell_measurement_theta_min      -23.529
_cell_volume                     2198.3(3)
_computing_cell_refinement       'BRUKER SMART'
_computing_data_collection       'BRUKER SMART'
_computing_data_reduction        'BRUKER SAINT'
_computing_molecular_graphics    Ortep-3
_computing_publication_material  'Wingx publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'Bruker Smart Apex'
_diffrn_measurement_method       'phi-omega scan'
_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  0.0273
_diffrn_reflns_av_sigmaI/netI    0.0360
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       39
_diffrn_reflns_limit_l_min       -38
_diffrn_reflns_number            25670
_diffrn_reflns_theta_full        28.32
_diffrn_reflns_theta_max         28.32
_diffrn_reflns_theta_min         1.36
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    1.901
_exptl_absorpt_correction_T_max  0.8674
_exptl_absorpt_correction_T_min  0.6448
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.430
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       columnar
_exptl_crystal_F_000             976
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.472
_refine_diff_density_min         -0.279
_refine_diff_density_rms         0.125
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.005(7)
_refine_ls_extinction_coef       0.0012(5)
_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   0.966
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     284
_refine_ls_number_reflns         5329
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.966
_refine_ls_R_factor_all          0.0524
_refine_ls_R_factor_gt           0.0350
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0527P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0766
_refine_ls_wR_factor_ref         0.0890
_reflns_number_gt                4006
_reflns_number_total             5329
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol200006e_si_003.cif
_cod_data_source_block           hcs2121f1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Empirical'
changed to 'empirical' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_Hall     P2ac2ab
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1501988