Enantioselective synthesis of indolizidines bearing quaternary substituted stereocenters via rhodium-catalyzed [2+2+2] cycloaddition of alkenyl isocyanates and terminal alkynes.
Lee, Ernest E.; Rovis, Tomislav; Organic letters 10 (2008) 1231–1234; doi:10.1021/ol800086s

data_1504571
_publ_section_title
;
 Enantioselective synthesis of indolizidines bearing quaternary
 substituted stereocenters via rhodium-catalyzed [2+2+2] cycloaddition of
 alkenyl isocyanates and terminal alkynes.
;
_journal_issue                   6
_journal_name_full               'Organic letters'
_journal_page_first              1231
_journal_page_last               1234
_journal_paper_doi               10.1021/ol800086s
_journal_volume                  10
_journal_year                    2008
_chemical_absolute_configuration ad
_chemical_formula_sum            'C15 H16 Br N O'
_chemical_formula_weight         306.20
_space_group_IT_number           96
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4nw 2abw'
_symmetry_space_group_name_H-M   'P 43 21 2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           'Bruker SHELXTL'
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   6.7025(3)
_cell_length_b                   6.7025(3)
_cell_length_c                   59.243(6)
_cell_measurement_reflns_used    2682
_cell_measurement_temperature    100
_cell_measurement_theta_max      24.71
_cell_measurement_theta_min      3.06
_cell_volume                     2661.4(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      100
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker Apex2 CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0614
_diffrn_reflns_av_sigmaI/netI    0.0626
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       82
_diffrn_reflns_limit_l_min       -82
_diffrn_reflns_number            18022
_diffrn_reflns_theta_full        29.90
_diffrn_reflns_theta_max         29.90
_diffrn_reflns_theta_min         2.75
_exptl_absorpt_coefficient_mu    3.076
_exptl_absorpt_correction_T_max  0.7383
_exptl_absorpt_correction_T_min  0.4807
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Sheldrick, 1997'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.528
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1248
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.720
_refine_diff_density_min         -0.436
_refine_diff_density_rms         0.079
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.027(13)
_refine_ls_goodness_of_fit_ref   1.018
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     164
_refine_ls_number_reflns         3849
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.018
_refine_ls_R_factor_all          0.0624
_refine_ls_R_factor_gt           0.0430
_refine_ls_shift/su_max          0.047
_refine_ls_shift/su_mean         0.004
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0330P)^2^+0.9658P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0823
_refine_ls_wR_factor_ref         0.0891
_reflns_number_gt                3065
_reflns_number_total             3849
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol800086s-file002.cif
_cod_data_source_block           rovis24
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Tetragonal' changed to 'tetragonal'
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 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      P4(3)2(1)2
_cod_database_code               1504571