Diastereoselective Michael Initiated Ring Closure on Vinyl Sulfone-Modified Carbohydrates: A Stereospecific and General Route to α-Substituted Cyclopropanes
Indrajit Das; Tarun K. Pal; Tanmaya Pathak; Journal of Organic Chemistry 72 (2007) 9181–9189; doi:10.1021/jo701378d

data_4022988
_publ_contact_author_address
'Department of Chemistry, IIT, Kharagpur 721 302, India'
_publ_contact_author_email       tpathak@chem.iitkgp.ernet.in
_publ_contact_author_name        'Tanmaya Pathak'
_publ_section_title
;
 Diastereoselective Michael Initiated Ring Closure on
 Vinyl Sulfone-Modified Carbohydrates: A Stereospecific and General
 Route to \a-Substituted Cyclopropanes
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              9181
_journal_page_last               9189
_journal_paper_doi               10.1021/jo701378d
_journal_volume                  72
_journal_year                    2007
_chemical_formula_moiety         'C20 H23 N O4 S'
_chemical_formula_sum            'C20 H23 N O4 S'
_chemical_formula_weight         373.47
_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                   9.453
_cell_length_b                   9.564
_cell_length_c                   21.897
_cell_measurement_reflns_used    0
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_volume                     1979.7
_computing_cell_refinement       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_collection       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXL-86 (Sheldrick, 1986)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  CAD4
_diffrn_measurement_method       'omega scan'
_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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0404
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2001
_diffrn_reflns_theta_full        24.96
_diffrn_reflns_theta_max         24.96
_diffrn_reflns_theta_min         1.86
_diffrn_standards_interval_time  '60 sec'
_diffrn_standards_number         25
_exptl_absorpt_coefficient_mu    0.187
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.253
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             792
_exptl_crystal_size_max          0.03
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.234
_refine_diff_density_min         -0.195
_refine_diff_density_rms         0.051
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.23(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     239
_refine_ls_number_reflns         2001
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0895
_refine_ls_R_factor_gt           0.0455
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0551P)^2^+0.3126P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0984
_refine_ls_wR_factor_ref         0.1134
_reflns_number_gt                1406
_reflns_number_total             2001
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo701378d-File003.cif
_cod_data_source_block           11
_cod_database_code               4022988