Asymmetric total synthesis of Lycopodium alkaloids α-obscurine, N-desmethyl-α-obscurine, β-obscurine and N-desmethyl-β-obscurine
Fu, Jian-Guo; Xu, Guang-Qiang; Ding, Rui; Lin, Guo-Qiang; Sun, Bing-Feng; Organic Chemistry Frontiers 3 (2016) 62–; doi:10.1039/C5QO00355E

data_1553213
_publ_section_title
;
 Asymmetric total synthesis of Lycopodium alkaloids \a-obscurine,
 N-desmethyl-\a-obscurine, \b-obscurine and N-desmethyl-\b-obscurine
;
_journal_issue                   1
_journal_name_full               'Organic Chemistry Frontiers'
_journal_page_first              62
_journal_paper_doi               10.1039/C5QO00355E
_journal_volume                  3
_journal_year                    2016
_chemical_absolute_configuration ad
_chemical_formula_sum            'C17 H25 Cl N2 O2'
_chemical_formula_weight         324.84
_space_group_IT_number           20
_space_group_name_Hall           'C 2c 2'
_space_group_name_H-M_alt        'C 2 2 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_H-M   'C 2 2 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2015-07-14 deposited with the CCDC.
2015-11-24 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   10.351(3)
_cell_length_b                   11.942(3)
_cell_length_c                   26.963(6)
_cell_measurement_reflns_used    1513
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      40.079
_cell_measurement_theta_min      5.201
_cell_volume                     3332.9(15)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_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      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0558
_diffrn_reflns_av_sigmaI/netI    0.0566
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            9747
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         1.51
_exptl_absorpt_coefficient_mu    0.238
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.52853
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.295
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             1392
_exptl_crystal_size_max          0.121
_exptl_crystal_size_mid          0.110
_exptl_crystal_size_min          0.056
_refine_diff_density_max         0.246
_refine_diff_density_min         -0.179
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.08(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     213
_refine_ls_number_reflns         3121
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.0725
_refine_ls_R_factor_gt           0.0543
_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^)+(0.0556P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1086
_refine_ls_wR_factor_ref         0.1165
_reflns_number_gt                2455
_reflns_number_total             3121
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c5qo00355e2.cif
_cod_data_source_block           cd212638
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Orthorhombic' was changed
to 'orthorhombic' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/RSC/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_cell_volume        3333.0(14)
_cod_original_sg_symbol_H-M      C222(1)
_cod_database_code               1553213