Preparation of tetrasubstituted furans via intramolecular Wittig reactions with phosphorus ylides as intermediates.
Kao, Tzu-Ting; Syu, Siang-en; Jhang, Yi-Wun; Lin, Wenwei; Organic letters 12 (2010) 3066–3069; doi:10.1021/ol101080q

data_1503042
_publ_section_title
;
 Preparation of tetrasubstituted furans via intramolecular Wittig
 reactions with phosphorus ylides as intermediates.
;
_journal_issue                   13
_journal_name_full               'Organic letters'
_journal_page_first              3066
_journal_page_last               3069
_journal_paper_doi               10.1021/ol101080q
_journal_volume                  12
_journal_year                    2010
_chemical_formula_moiety         'C25 H19 N O5'
_chemical_formula_sum            'C25 H19 N O5'
_chemical_formula_weight         413.41
_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                 103.227(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.2495(14)
_cell_length_b                   9.5744(11)
_cell_length_c                   17.716(2)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_volume                     2022.6(4)
_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  0.0330
_diffrn_reflns_av_sigmaI/netI    0.0304
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            12742
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.36
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_T_max  0.9656
_exptl_absorpt_correction_T_min  0.9312
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.358
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             864
_exptl_crystal_size_max          0.76
_exptl_crystal_size_mid          0.72
_exptl_crystal_size_min          0.37
_refine_diff_density_max         0.172
_refine_diff_density_min         -0.252
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    fixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     280
_refine_ls_number_reflns         3552
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0462
_refine_ls_R_factor_gt           0.0379
_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^)+(0.0520P)^2^+0.4972P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0947
_refine_ls_wR_factor_ref         0.1011
_reflns_number_gt                2997
_reflns_number_total             3552
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol101080q_si_001.cif
_cod_data_source_block           a10264a
_cod_original_cell_volume        2022.7(4)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1503042