Total synthesis of (±)-hirsutine: application of phosphine-catalyzed imine-allene [4 + 2] annulation.
Villa, Reymundo A.; Xu, Qihai; Kwon, Ohyun; Organic letters 14 (2012) 4634–4637; doi:10.1021/ol302077n

data_1516105
_publ_section_title
;
 Total synthesis of (+-)-hirsutine: application of phosphine-catalyzed
 imine-allene [4 + 2] annulation.
;
_journal_issue                   17
_journal_name_full               'Organic letters'
_journal_page_first              4634
_journal_page_last               4637
_journal_paper_doi               10.1021/ol302077n
_journal_volume                  14
_journal_year                    2012
_chemical_formula_moiety         'C22 H26 N2 O6'
_chemical_formula_sum            'C22 H26 N2 O6'
_chemical_formula_weight         414.45
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 110.574(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.618(3)
_cell_length_b                   12.024(3)
_cell_length_c                   16.150(4)
_cell_measurement_reflns_used    2834
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.07
_cell_measurement_theta_min      2.16
_cell_volume                     2112.2(9)
_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      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.971
_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  0.0796
_diffrn_reflns_av_sigmaI/netI    0.1042
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            18676
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         1.88
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_T_max  0.9905
_exptl_absorpt_correction_T_min  0.9202
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sadabs (Bruker)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.303
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cut-prism
_exptl_crystal_F_000             880
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.266
_refine_diff_density_min         -0.225
_refine_diff_density_rms         0.057
_refine_ls_extinction_coef       0.009(2)
_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   1.011
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     289
_refine_ls_number_reflns         5087
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.011
_refine_ls_R_factor_all          0.1738
_refine_ls_R_factor_gt           0.0787
_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^)+(0.1045P)^2^+0.3687P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1807
_refine_ls_wR_factor_ref         0.2301
_reflns_number_gt                2317
_reflns_number_total             5087
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol302077n_si_002.cif
_cod_data_source_block           kw205sm
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               1516105