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_4030631
_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 H19 N O5'
_chemical_formula_sum            'C27 H19 N O5'
_chemical_formula_weight         437.43
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_symmetry_cell_setting           triclinic
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_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                76.924(4)
_cell_angle_beta                 81.781(4)
_cell_angle_gamma                75.721(4)
_cell_formula_units_Z            2
_cell_length_a                   8.4535(7)
_cell_length_b                   9.2384(6)
_cell_length_c                   14.6945(9)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_volume                     1078.68(13)
_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 0.994
_diffrn_measured_fraction_theta_max 0.994
_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  0.0538
_diffrn_reflns_av_sigmaI/netI    0.0608
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            9588
_diffrn_reflns_theta_full        24.98
_diffrn_reflns_theta_max         24.98
_diffrn_reflns_theta_min         2.32
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_T_max  0.9852
_exptl_absorpt_correction_T_min  0.9332
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            'pale purple'
_exptl_crystal_density_diffrn    1.347
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             456
_exptl_crystal_size_max          0.75
_exptl_crystal_size_mid          0.53
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.219
_refine_diff_density_min         -0.303
_refine_diff_density_rms         0.056
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     298
_refine_ls_number_reflns         3751
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0611
_refine_ls_R_factor_gt           0.0448
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0441P)^2^+0.1534P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1034
_refine_ls_wR_factor_ref         0.1138
_reflns_number_gt                2881
_reflns_number_total             3751
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo502232q_si_002.cif
_cod_data_source_block           a15743
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