On the elucidation of the mechanism of Vinca alkaloid fluorination in superacidic medium.
Giovanelli, Emerson; Leroux, Sébastien; Moisan, Lionel; Carreyre, Hélène; Thuéry, Pierre; Buisson, David-Alexandre; Meddour, Abdelkrim; Coustard, Jean-Marie; Thibaudeau, Sébastien; Rousseau, Bernard; Nicolas, Marc; Hellier, Paul; Doris, Eric; Organic letters 13 (2011) 4116–4119; doi:10.1021/ol201637m

data_1502346
_publ_section_title
;
 On the elucidation of the mechanism of Vinca alkaloid fluorination in
 superacidic medium.
;
_journal_issue                   15
_journal_name_full               'Organic letters'
_journal_page_first              4116
_journal_page_last               4119
_journal_paper_doi               10.1021/ol201637m
_journal_volume                  13
_journal_year                    2011
_chemical_absolute_configuration syn
_chemical_formula_sum            'C21 H24 N2 O2'
_chemical_formula_weight         336.42
_space_group_IT_number           92
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4abw 2nw'
_symmetry_space_group_name_H-M   'P 41 21 2'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   9.1072(3)
_cell_length_b                   9.1072(3)
_cell_length_c                   42.969(3)
_cell_measurement_reflns_used    21434
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.67
_cell_measurement_theta_min      2.93
_cell_volume                     3563.9(3)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'Kappa-CCD software (Nonius B.V., 1998)'
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.963
_diffrn_measured_fraction_theta_max 0.963
_diffrn_measurement_device_type  'Nonius Kappa-CCD'
_diffrn_measurement_method       '\f 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  0.0389
_diffrn_reflns_av_sigmaI/netI    0.0574
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       51
_diffrn_reflns_limit_l_min       -51
_diffrn_reflns_number            21434
_diffrn_reflns_theta_full        25.67
_diffrn_reflns_theta_max         25.67
_diffrn_reflns_theta_min         2.93
_diffrn_standards_decay_%        none
_diffrn_standards_interval_time  0
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.254
_exptl_crystal_description       irregular
_exptl_crystal_F_000             1440
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.137
_refine_diff_density_min         -0.175
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.074
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     228
_refine_ls_number_reflns         2004
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.074
_refine_ls_R_factor_all          0.0605
_refine_ls_R_factor_gt           0.0442
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0488P)^2^+0.6721P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0980
_refine_ls_wR_factor_ref         0.1054
_reflns_number_gt                1640
_reflns_number_total             2004
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol201637m_si_002.cif
_cod_data_source_block           isocatharanthine_12
_cod_database_code               1502346