Diastereoselective Synthesis oftrans-2,3-Dihydrofurans with Pyridinium Ylide Assisted Tandem Reaction
Qi-Fang Wang; Hong Hou; Li Hui; Chao-Guo Yan; Journal of Organic Chemistry 74 (2009) 7403–7406; doi:10.1021/jo901379h

data_4024877
_publ_contact_author_address
;
      College of Chemistry & Chemical Engineering
      Yangzhou University
      Yangzhou 225002, 
      P.R. China
;
_publ_contact_author_email       cgyan@yzu.edu.cn
_publ_contact_author_fax         +86-514-7975590-8401
_publ_contact_author_name        'Chao Guo Yan'
_publ_contact_author_phone       +86-514-7975531
_publ_section_title
;
Diastereoselective Synthesis oftrans-2,3-Dihydrofurans with Pyridinium
Ylide Assisted Tandem Reaction
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              7403
_journal_page_last               7406
_journal_paper_doi               10.1021/jo901379h
_journal_volume                  74
_journal_year                    2009
_chemical_absolute_configuration rm
_chemical_formula_moiety         'C21 H18 O3 '
_chemical_formula_sum            'C21 H18 O3'
_chemical_formula_weight         318.35
_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                   8.6980(11)
_cell_length_b                   9.5228(12)
_cell_length_c                   20.257(3)
_cell_measurement_reflns_used    6226
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      26.11
_cell_measurement_theta_min      2.36
_cell_volume                     1677.9(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_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  0.0357
_diffrn_reflns_av_sigmaI/netI    0.0298
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            14398
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         2.01
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.983
_exptl_absorpt_correction_T_min  0.976
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.260
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             672.0
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.465
_refine_diff_density_min         -0.340
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0(2)
_refine_ls_extinction_coef       0.028(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.083
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         3793
_refine_ls_number_restraints     49
_refine_ls_restrained_S_all      1.181
_refine_ls_R_factor_all          0.0636
_refine_ls_R_factor_gt           0.0553
_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^)+(0.0712P)^2^+0.5905P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1519
_refine_ls_wR_factor_ref         0.1599
_reflns_number_gt                3283
_reflns_number_total             3793
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo901379h_si_001_3.cif
_cod_data_source_block           cj090519_0m__2a
_cod_original_sg_symbol_Hall     'P 2ac 2ab  '
_cod_original_sg_symbol_H-M      'P 21 21 21 '
_cod_database_code               4024877