Chemoselective intramolecular Wittig reactions for the synthesis of oxazoles and benzofurans.
Fan, Yu-Shiou; Das, Utpal; Hsiao, Ming-Yu; Liu, Meng-Hsien; Lin, Wenwei; The Journal of organic chemistry 79 (2014) 11567–11582; doi:10.1021/jo502232q

data_4030639
_publ_section_title
;
 Chemoselective intramolecular Wittig reactions for the synthesis of
 oxazoles and benzofurans.
;
_journal_issue                   23
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              11567
_journal_page_last               11582
_journal_paper_doi               10.1021/jo502232q
_journal_volume                  79
_journal_year                    2014
_chemical_formula_moiety         'C27 H24 Br N O4'
_chemical_formula_sum            'C27 H24 Br N O4'
_chemical_formula_weight         506.38
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 97.136(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.167(6)
_cell_length_b                   7.776(3)
_cell_length_c                   20.869(8)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_volume                     2442.2(16)
_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      200(2)
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_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  0.0774
_diffrn_reflns_av_sigmaI/netI    0.1035
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            17650
_diffrn_reflns_theta_full        25.20
_diffrn_reflns_theta_max         25.20
_diffrn_reflns_theta_min         1.35
_exptl_absorpt_coefficient_mu    1.716
_exptl_absorpt_correction_T_max  0.8337
_exptl_absorpt_correction_T_min  0.5617
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.377
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1040
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.547
_refine_diff_density_min         -0.449
_refine_diff_density_rms         0.060
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.009
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     353
_refine_ls_number_reflns         4320
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.010
_refine_ls_R_factor_all          0.1615
_refine_ls_R_factor_gt           0.0605
_refine_ls_shift/su_max          0.076
_refine_ls_shift/su_mean         0.006
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0646P)^2^+1.4084P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1293
_refine_ls_wR_factor_ref         0.1639
_reflns_number_gt                2050
_reflns_number_total             4320
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo502232q_si_002.cif
_cod_data_source_block           a15699
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4030639