Catalytic Asymmetric Intermolecular Stetter Reaction of Heterocyclic Aldehydes with Nitroalkenes: Backbone Fluorination Improves Selectivity
Daniel A. DiRocco; Kevin M. Oberg; Derek M. Dalton; Tomislav Rovis; Journal of the American Chemical Society 131 (2009) 10872–10874; doi:10.1021/ja904375q

data_4104850
_publ_section_title
;
 Catalytic Asymmetric Intermolecular Stetter Reaction of Heterocyclic
 Aldehydes with Nitroalkenes: Backbone Fluorination Improves Selectivity
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              10872
_journal_page_last               10874
_journal_paper_doi               10.1021/ja904375q
_journal_volume                  131
_journal_year                    2009
_chemical_absolute_configuration ad
_chemical_formula_sum            'C12 H15 Br N2 O3 S'
_chemical_formula_weight         347.23
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_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_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.6745(3)
_cell_length_b                   13.5498(6)
_cell_length_c                   17.9944(8)
_cell_measurement_reflns_used    5216
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      30.49
_cell_measurement_theta_min      2.72
_cell_volume                     1383.56(11)
_computing_cell_refinement       'APEX2 (Bruker, 2009)'
_computing_data_collection       'APEX2 (Bruker, 2009)'
_computing_data_reduction        'APEX2 (Bruker, 2009)'
_computing_molecular_graphics    'APEX2 (Bruker, 2009)'
_computing_publication_material  'APEX2 (Bruker, 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'XS (Sheldrick, 2008)'
_diffrn_ambient_temperature      120
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_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  0.0334
_diffrn_reflns_av_sigmaI/netI    0.0699
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            9320
_diffrn_reflns_theta_full        30.60
_diffrn_reflns_theta_max         30.60
_diffrn_reflns_theta_min         2.26
_exptl_absorpt_coefficient_mu    3.127
_exptl_absorpt_correction_T_max  0.3692
_exptl_absorpt_correction_T_min  0.3141
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sheldrick, G. M. (2008) SADABS.'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.667
_exptl_crystal_description       prismic
_exptl_crystal_F_000             704
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.45
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.490
_refine_diff_density_min         -0.794
_refine_diff_density_rms         0.074
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.012(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.876
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     173
_refine_ls_number_reflns         4112
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.876
_refine_ls_R_factor_all          0.0455
_refine_ls_R_factor_gt           0.0317
_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^)+(0.0000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0543
_refine_ls_wR_factor_ref         0.0577
_reflns_number_gt                3365
_reflns_number_total             4112
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja904375q_si_002.cif
_cod_data_source_block           rovis46
_cod_database_code               4104850