Asymmetric Diels-Alder reaction of 3-olefinic benzofuran-2-ones and polyenals: construction of chiral spirocyclic benzofuran-2-ones.
Li, Xin; Lin, Mao-Hui; Han, Yu; Wang, Feng; Cheng, Jin-Pei; Organic letters 16 (2014) 114–117; doi:10.1021/ol403094a

data_1513549
_publ_section_title
;
 Asymmetric Diels-Alder reaction of 3-olefinic benzofuran-2-ones and
 polyenals: construction of chiral spirocyclic benzofuran-2-ones.
;
_journal_issue                   1
_journal_name_full               'Organic letters'
_journal_page_first              114
_journal_page_last               117
_journal_paper_doi               10.1021/ol403094a
_journal_volume                  16
_journal_year                    2014
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C16 H14 O4'
_chemical_formula_sum            'C16 H14 O4'
_chemical_formula_weight         270.27
_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                   8.7505(8)
_cell_length_b                   9.3028(7)
_cell_length_c                   15.4206(13)
_cell_measurement_reflns_used    4369
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.19
_cell_volume                     1255.30(18)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2007)'
_computing_molecular_graphics    'Olex2 ver 1.1'
_computing_publication_material  'SHELX97 (Sheldrick, 2008)'
_computing_structure_refinement  'Olex2 ver 1.1'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Saturn724+ CCD'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0308
_diffrn_reflns_av_sigmaI/netI    0.0211
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            9442
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         2.56
_exptl_absorpt_coefficient_mu    0.103
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.5947
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2007)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.430
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             568
_exptl_crystal_size_max          0.80
_exptl_crystal_size_mid          0.80
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.167
_refine_diff_density_min         -0.217
_refine_diff_density_rms         0.046
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   2.1(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.145
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     181
_refine_ls_number_reflns         2868
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.145
_refine_ls_R_factor_all          0.0369
_refine_ls_R_factor_gt           0.0366
_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^)+(0.0458P)^2^+0.2252P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0960
_refine_ls_wR_factor_ref         0.0962
_reflns_number_gt                2849
_reflns_number_total             2868
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol403094a_si_002.cif
_cod_data_source_block           sa2917
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1513549