Enantioselective total synthesis of (+)- and (-)-nigellamine A2.
Bian, Jianwei; Van Wingerden, Matthew; Ready, Joseph M; Journal of the American Chemical Society 128 (2006) 7428–7429; doi:10.1021/ja061559n

data_4101508
_publ_section_title
;
 Enantioselective total synthesis of (+)- and (-)-nigellamine A2.
;
_journal_issue                   23
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7428
_journal_page_last               7429
_journal_paper_doi               10.1021/ja061559n
_journal_volume                  128
_journal_year                    2006
_chemical_formula_moiety         'C14 H19 I O4'
_chemical_formula_sum            'C14 H19 I O4'
_chemical_formula_weight         378.19
_space_group_IT_number           5
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      5
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 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                 124.485(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.482(4)
_cell_length_b                   8.7351(18)
_cell_length_c                   11.511(2)
_cell_measurement_reflns_used    819
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      27.78
_cell_measurement_theta_min      2.93
_cell_volume                     1531.8(5)
_computing_cell_refinement       'SMART (BRUKER, V5.625, 2001)'
_computing_data_collection       'ASTRO (BRUKER, V5.007, 1997)'
_computing_data_reduction        'SAINT (BRUKER, V6.22, 2001)'
_computing_molecular_graphics    'SHELXTL (BRUKER, 2000, V6.1)'
_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      193(2)
_diffrn_detector_area_resol_mean 836.6
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker CCD'
_diffrn_measurement_method       '\w, 0.3 deg'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0369
_diffrn_reflns_av_sigmaI/netI    0.0517
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            4133
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         2.15
_diffrn_source                   'normal-focus sealed tube'
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    2.098
_exptl_absorpt_correction_T_max  0.9208
_exptl_absorpt_correction_T_min  0.8177
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.640
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needles
_exptl_crystal_F_000             752
_exptl_crystal_recrystallization_method 'Slow Evaporation from Hexanes'
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.04
_refine_diff_density_max         1.320
_refine_diff_density_min         -1.141
_refine_diff_density_rms         0.126
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.02(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.277
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     175
_refine_ls_number_reflns         2024
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.276
_refine_ls_R_factor_all          0.0551
_refine_ls_R_factor_gt           0.0509
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0226P)^2^+6.7059P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0976
_refine_ls_wR_factor_ref         0.0990
_reflns_number_gt                1916
_reflns_number_total             2024
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja061559nsi20060517_051425.cif
_cod_data_source_block           jr106t
_cod_depositor_comments
;
The following automatic conversions were performed:
'_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_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      'C 2'
_cod_database_code               4101508