Total Synthesis of (±)-α-Isosparteine, (±)-β-Isosparteine, and (±)-Sparteine from a Common Tetraoxobispidine Intermediate
Neil R. Norcross; John P. Melbardis; Margarita Ferris Solera; Mark A. Sephton; Colin Kilner; Lev N. Zakharov; Peter C. Astles; Stuart L. Warriner; Paul R. Blakemore; Journal of Organic Chemistry 73 (2008) 7939–7951; doi:10.1021/jo8013512

data_4023733
_publ_section_title
;
 Total Synthesis of (+-)-\a-Isosparteine, (+-)-\b-Isosparteine, and
 (+-)-Sparteine from a Common Tetraoxobispidine Intermediate
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              7939
_journal_page_last               7951
_journal_paper_doi               10.1021/jo8013512
_journal_volume                  73
_journal_year                    2008
_chemical_formula_sum            'C19 H26 N2 O4'
_chemical_formula_weight         346.42
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 114.014(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.379(4)
_cell_length_b                   9.4950(19)
_cell_length_c                   11.587(2)
_cell_measurement_reflns_used    2414
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      28.09
_cell_measurement_theta_min      2.47
_cell_volume                     1847.1(6)
_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  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      153(2)
_diffrn_measured_fraction_theta_full 0.924
_diffrn_measured_fraction_theta_max 0.924
_diffrn_measurement_device_type  '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  0.0247
_diffrn_reflns_av_sigmaI/netI    0.0283
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            5155
_diffrn_reflns_theta_full        28.00
_diffrn_reflns_theta_max         28.00
_diffrn_reflns_theta_min         2.43
_exptl_absorpt_coefficient_mu    0.087
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.534
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.246
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             744
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.739
_refine_diff_density_min         -0.210
_refine_diff_density_rms         0.059
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     162
_refine_ls_number_reflns         2066
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.0577
_refine_ls_R_factor_gt           0.0510
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0841P)^2^+1.3745P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1389
_refine_ls_wR_factor_ref         0.1465
_reflns_number_gt                1774
_reflns_number_total             2066
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo8013512_si_004.cif
_cod_data_source_block           cmpd30
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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/c'
_cod_database_code               4023733