Versatile strategy to access tricycles related to quassinoids and triterpenes.
Caron, Pierre-Yves; Deslongchamps, Pierre; Organic letters 12 (2010) 508–511; doi:10.1021/ol902711b

data_1503390
_publ_section_title
;
 Versatile strategy to access tricycles related to quassinoids and
 triterpenes.
;
_journal_issue                   3
_journal_name_full               'Organic letters'
_journal_page_first              508
_journal_page_last               511
_journal_paper_doi               10.1021/ol902711b
_journal_volume                  12
_journal_year                    2010
_chemical_absolute_configuration unk
_chemical_formula_sum            'C25 H29 N O3'
_chemical_formula_weight         391.49
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           5
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.3
_audit_creation_date             2009-04-09T11:20:39-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 110.108(13)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   15.457(3)
_cell_length_b                   9.311(2)
_cell_length_c                   15.892(3)
_cell_measurement_reflns_used    20
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      35
_cell_measurement_theta_min      30
_cell_volume                     2147.8(8)
_computing_cell_refinement       Difrac
_computing_data_collection       Difrac
_computing_data_reduction        NRCVAX
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.951
_diffrn_measured_fraction_theta_max 0.951
_diffrn_measurement_device_type  CAD4
_diffrn_measurement_method       Omega
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54176
_diffrn_reflns_av_R_equivalents  0
_diffrn_reflns_av_unetI/netI     0.0215
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2064
_diffrn_reflns_theta_full        69.96
_diffrn_reflns_theta_max         69.96
_diffrn_reflns_theta_min         5.65
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 100
_diffrn_standards_number         1
_exptl_absorpt_coefficient_mu    0.624
_exptl_absorpt_correction_T_max  0.8853
_exptl_absorpt_correction_T_min  0.7058
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   Empirical
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.211
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             840
_exptl_crystal_size_max          0.6
_exptl_crystal_size_mid          0.5
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.231
_refine_diff_density_min         -0.198
_refine_diff_density_rms         0.057
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.0(6)
_refine_ls_extinction_coef       0.033(3)
_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   1.004
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     263
_refine_ls_number_reflns         2064
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.003
_refine_ls_R_factor_all          0.0954
_refine_ls_R_factor_gt           0.0756
_refine_ls_shift/su_max          0
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1623P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1855
_refine_ls_wR_factor_ref         0.2075
_reflns_number_gt                1477
_reflns_number_total             2064
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol902711b_si_003.cif
_cod_data_source_block           pc3090
_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 2.4.2 from
2011-04-26.

'_exptl_absorpt_correction_type' value 'Psi-Scan'
changed to 'psi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        2147.7(7)
_cod_original_sg_symbol_H-M      C2
_cod_database_code               1503390