Enantioselective total synthesis of the indole alkaloid 16-episilicine.
Amat, Mercedes; Checa, Begoña; Llor, Núria; Molins, Elies; Bosch, Joan; Chemical communications (Cambridge, England) 34 (2009) 2935–2937; doi:10.1039/b904521j

data_7104448
_publ_section_title
;
 Enantioselective total synthesis of the indole alkaloid
 16-episilicine.
;
_journal_issue                   20
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              2935
_journal_page_last               2937
_journal_paper_doi               10.1039/b904521j
_journal_volume                  34
_journal_year                    2009
_chemical_absolute_configuration ad
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C32 H30 N2 O4 S1'
_chemical_formula_sum            'C32 H30 N2 O4 S'
_chemical_formula_weight         538.64
_chemical_name_systematic
;
?
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      19
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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             2008-11-07T20:14:05-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.004(5)
_cell_length_b                   14.264(3)
_cell_length_c                   20.840(6)
_cell_measurement_reflns_used    24
_cell_measurement_temperature    565(2)
_cell_measurement_theta_max      15.3
_cell_measurement_theta_min      9.2
_cell_measurement_wavelength     0.71073
_cell_volume                     2676.5(18)
_computing_cell_refinement       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_collection       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1986)'
_diffrn_ambient_temperature      565(2)
_diffrn_detector                 'scintillation LiI'
_diffrn_detector_dtime           1.195
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'Enraf Nonius CAD4'
_diffrn_measurement_method       'non-profiled omega scans'
_diffrn_orient_matrix_type
;
x-axis points to radiation source
the matrix is specified in reciprocal space
;
_diffrn_orient_matrix_UB_11      0.019789
_diffrn_orient_matrix_UB_12      -0.000662
_diffrn_orient_matrix_UB_13      -0.047221
_diffrn_orient_matrix_UB_21      0.002195
_diffrn_orient_matrix_UB_22      -0.070118
_diffrn_orient_matrix_UB_23      0.000633
_diffrn_orient_matrix_UB_31      -0.109321
_diffrn_orient_matrix_UB_32      -0.001742
_diffrn_orient_matrix_UB_33      -0.008594
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0
_diffrn_reflns_av_unetI/netI     0.0653
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2660
_diffrn_reflns_theta_full        24.94
_diffrn_reflns_theta_max         24.94
_diffrn_reflns_theta_min         1.73
_diffrn_source                   'Enraf Nonius FR590'
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  60
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.163
_exptl_absorpt_correction_T_max  0.9696
_exptl_absorpt_correction_T_min  0.9054
_exptl_absorpt_correction_type   refdelf
_exptl_absorpt_process_details
;
Walker, N. & Stuart, D (1983) Acta. Cryst. A39, 158-166
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.337
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1136
_exptl_crystal_size_max          0.47
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.17
_refine_diff_density_min         -0.223
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.18(15)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.016
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     353
_refine_ls_number_reflns         2660
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.016
_refine_ls_R_factor_all          0.0948
_refine_ls_R_factor_gt           0.0477
_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^)+(0.0364P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0833
_refine_ls_wR_factor_ref         0.097
_reflns_number_gt                1701
_reflns_number_total             2660
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b904521j.txt
_cod_data_source_block           jb68d
_cod_original_formula_sum        'C32 H30 N2 O4 S1'
_cod_database_code               7104448