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_4023736
_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            'C15 H22 N2 O3'
_chemical_formula_weight         278.35
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXLTL
_cell_angle_alpha                90.00
_cell_angle_beta                 103.002(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.4502(13)
_cell_length_b                   8.4070(11)
_cell_length_c                   16.290(2)
_cell_measurement_reflns_used    2650
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      24.44
_cell_measurement_theta_min      2.57
_cell_volume                     1394.5(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      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0332
_diffrn_reflns_av_sigmaI/netI    0.0296
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            12970
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         2.00
_exptl_absorpt_coefficient_mu    0.093
_exptl_absorpt_correction_T_max  0.9871
_exptl_absorpt_correction_T_min  0.9710
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.326
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             600
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.305
_refine_diff_density_min         -0.185
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.002
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     269
_refine_ls_number_reflns         3036
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.002
_refine_ls_R_factor_all          0.0578
_refine_ls_R_factor_gt           0.0428
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0701P)^2^+0.2619P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1082
_refine_ls_wR_factor_ref         0.1229
_reflns_number_gt                2413
_reflns_number_total             3036
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo8013512_si_007.cif
_cod_data_source_block           cmpd45
_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      'P 21/c'
_cod_database_code               4023736