Isothiourea-mediated stereoselective C-acylation of silyl ketene acetals.
Woods, Philip A.; Morrill, Louis C.; Lebl, Tomas; Slawin, Alexandra M. Z.; Bragg, Ryan A.; Smith, Andrew D.; Organic letters 12 (2010) 2660–2663; doi:10.1021/ol1008747

data_1503012
_publ_section_title
;
 Isothiourea-mediated stereoselective C-acylation of silyl ketene acetals.
;
_journal_issue                   11
_journal_name_full               'Organic letters'
_journal_page_first              2660
_journal_page_last               2663
_journal_paper_doi               10.1021/ol1008747
_journal_volume                  12
_journal_year                    2010
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C17 H16 O3 S'
_chemical_formula_sum            'C17 H16 O3 S'
_chemical_formula_weight         300.36
_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                   6.454(5)
_cell_length_b                   14.297(12)
_cell_length_c                   16.313(15)
_cell_measurement_reflns_used    4619
_cell_measurement_temperature    125(2)
_cell_measurement_theta_max      26.4
_cell_measurement_theta_min      1.9
_cell_volume                     1505(2)
_computing_cell_refinement       'CrystalClear (Rigaku Corp., 2004)'
_computing_data_collection       'CrystalClear (Rigaku Corp., 2004)'
_computing_data_reduction        'CrystalClear (Rigaku Corp., 2004)'
_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      125(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  Saturn724
_diffrn_measurement_method       '\w 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  0.1108
_diffrn_reflns_av_sigmaI/netI    0.1383
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            5134
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         1.89
_exptl_absorpt_coefficient_mu    0.222
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.9278
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.325
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             632
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.364
_refine_diff_density_min         -0.393
_refine_diff_density_rms         0.095
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.6(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.180
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     191
_refine_ls_number_reflns         2635
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.180
_refine_ls_R_factor_all          0.1621
_refine_ls_R_factor_gt           0.1384
_refine_ls_shift/su_max          0.031
_refine_ls_shift/su_mean         0.007
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0705P)^2^+6.0095P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2697
_refine_ls_wR_factor_ref         0.2918
_reflns_number_gt                2105
_reflns_number_total             2635
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol1008747_si_002.cif
_cod_data_source_block           33
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1503012