l-Proline-catalyzed direct intermolecular asymmetric aldol reactions of 1-phenylthiocycloalkyl carboxaldehydes with ketones. Easy access to spiro- and fused-cyclobutyl tetrahydrofurans and cyclopentanones.
Bernard, Angela M.; Frongia, Angelo; Guillot, Regis; Piras, Pier P.; Secci, Francesco; Spiga, Marco; Organic letters 9 (2007) 541–544; doi:10.1021/ol063084a

data_1505313
_publ_section_title
;
 l-Proline-catalyzed direct intermolecular asymmetric aldol reactions of
 1-phenylthiocycloalkyl carboxaldehydes with ketones. Easy access to
 spiro- and fused-cyclobutyl tetrahydrofurans and cyclopentanones.
;
_journal_issue                   3
_journal_name_full               'Organic letters'
_journal_page_first              541
_journal_page_last               544
_journal_paper_doi               10.1021/ol063084a
_journal_volume                  9
_journal_year                    2007
_chemical_formula_moiety         'C13 H16 O3 S'
_chemical_formula_sum            'C13 H16 O3 S'
_chemical_formula_weight         252.32
_chemical_name_systematic
'3-methyl-1-(phenylsulfonyl)-2-oxabicyclo[3.2.0]heptane '
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_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                 100.291(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.9997(8)
_cell_length_b                   7.7914(6)
_cell_length_c                   14.7177(11)
_cell_measurement_reflns_used    6249
_cell_measurement_temperature    100(1)
_cell_measurement_theta_max      42.73
_cell_measurement_theta_min      2.97
_cell_volume                     1241.06(16)
_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  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      100(1)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.930
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0213
_diffrn_reflns_av_sigmaI/netI    0.0239
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            27605
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         43.27
_diffrn_reflns_theta_min         1.88
_diffrn_source                   'fine-focus sealed tube'
_diffrn_source_type              'kappa X8 APEX II Bruker ICMMO'
_exptl_absorpt_coefficient_mu    0.254
_exptl_absorpt_correction_T_max  0.97
_exptl_absorpt_correction_T_min  0.92
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.350
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             536
_exptl_crystal_size_max          0.280
_exptl_crystal_size_mid          0.240
_exptl_crystal_size_min          0.140
_refine_diff_density_max         0.584
_refine_diff_density_min         -0.402
_refine_diff_density_rms         0.121
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.025
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     155
_refine_ls_number_reflns         8664
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.025
_refine_ls_R_factor_all          0.0468
_refine_ls_R_factor_gt           0.0329
_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^)+(0.0544P)^2^+0.1390P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0914
_refine_ls_wR_factor_ref         0.0993
_reflns_number_gt                6808
_reflns_number_total             8664
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol063084asi20061218_031102.cif
_cod_data_source_block           553GuillotICMMO
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1505313