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_4101506
_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_sum            'C31 H33 N2 O5'
_chemical_formula_weight         513.59
_chemical_name_systematic
; 
 ? 
;
_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                 90.000
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.878(7)
_cell_length_b                   12.732(4)
_cell_length_c                   25.1550(14)
_cell_measurement_temperature    293(2)
_cell_volume                     2843(2)
_computing_cell_refinement       'HKL2000 v095.373'
_computing_data_collection       'Collect (Nonius, 1999)'
_computing_data_reduction        ' HKL2000 v095.373'
_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      293(2)
_diffrn_measured_fraction_theta_full 0.896
_diffrn_measured_fraction_theta_max 0.896
_diffrn_measurement_device_type  'Bruker KappaCCD'
_diffrn_measurement_method       Collect
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.1279
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2100
_diffrn_reflns_theta_full        23.25
_diffrn_reflns_theta_max         23.25
_diffrn_reflns_theta_min         1.79
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.200
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needles
_exptl_crystal_F_000             1092
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.197
_refine_diff_density_min         -0.168
_refine_diff_density_rms         0.042
_refine_ls_extinction_coef       0.031(7)
_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   0.980
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     347
_refine_ls_number_reflns         2100
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.980
_refine_ls_R_factor_all          0.1446
_refine_ls_R_factor_gt           0.0716
_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^)+(0.0997P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1533
_refine_ls_wR_factor_ref         0.1883
_reflns_number_gt                1198
_reflns_number_total             2100
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja061559nsi20060517_051353.cif
_cod_data_source_block           shelxl
_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.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_database_code               4101506