Enantioselective formal [3+3] annulation for the direct construction of bicyclic skeletons with four stereogenic centers.
Cao, Chun-Li; Sun, Xiu-Li; Kang, Yan-Biao; Tang, Yong; Organic letters 9 (2007) 4151–4154; doi:10.1021/ol701669b

data_1505530
_publ_section_title
;
 Enantioselective formal [3+3] annulation for the direct construction of
 bicyclic skeletons with four stereogenic centers.
;
_journal_issue                   21
_journal_name_full               'Organic letters'
_journal_page_first              4151
_journal_page_last               4154
_journal_paper_doi               10.1021/ol701669b
_journal_volume                  9
_journal_year                    2007
_chemical_absolute_configuration ad
_chemical_formula_sum            'C17 H20 O4'
_chemical_formula_weight         288.33
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 92.659(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.1272(8)
_cell_length_b                   11.9338(16)
_cell_length_c                   10.1958(13)
_cell_measurement_reflns_used    2755
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      55.735
_cell_measurement_theta_min      5.258
_cell_volume                     744.72(17)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_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      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_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  0.0872
_diffrn_reflns_av_sigmaI/netI    0.0547
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            4349
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         2.00
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.75479
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.286
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             308
_exptl_crystal_size_max          0.501
_exptl_crystal_size_mid          0.446
_exptl_crystal_size_min          0.347
_refine_diff_density_max         0.308
_refine_diff_density_min         -0.246
_refine_diff_density_rms         0.052
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -10(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.036
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     195
_refine_ls_number_reflns         1692
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0461
_refine_ls_R_factor_gt           0.0443
_refine_ls_shift/su_max          0.007
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0791P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1145
_refine_ls_wR_factor_ref         0.1160
_reflns_number_gt                1600
_reflns_number_total             1692
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol701669b-file003.cif
_cod_data_source_block           cd27122
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               1505530