A temporary stereocentre approach for the asymmetric synthesis of chiral cyclopropane-carboxaldehydes
Cheeseman, Matt; Davies, Iwan R.; Axe, Phil; Johnson, Andrew L.; Bull, Steven D.; Organic & Biomolecular Chemistry 7 (2009) 3537–3548; doi:10.1039/b908600e

data_7150722
_publ_section_title
;
 A temporary stereocentre approach for the asymmetric synthesis of
 chiral cyclopropane-carboxaldehydes
;
_journal_issue                   17
_journal_name_full               'Organic &amp; Biomolecular Chemistry'
_journal_page_first              3537
_journal_page_last               3548
_journal_paper_doi               10.1039/b908600e
_journal_volume                  7
_journal_year                    2009
_chemical_absolute_configuration syn
_chemical_formula_sum            'C25 H28 N2 O6'
_chemical_formula_weight         452.49
_chemical_name_common            'Compound 4d'
_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                   7.67000(10)
_cell_length_b                   14.8370(3)
_cell_length_c                   20.5190(3)
_cell_measurement_reflns_used    32654
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.72
_cell_volume                     2335.06(7)
_computing_cell_refinement
'Collect, Nonius program suite version 1.9 (1997)'
_computing_data_collection
'Collect, Nonius program suite version 1.9 (1997)'
_computing_data_reduction
'Denzo and Scalepack (otwinowski & Minor, 1997)'
_computing_molecular_graphics    'ORTEX (P.McArdle, 1995)'
_computing_publication_material  'SHELXL-97/2 (Sheldrick,1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       KappaCCD
_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  0.1280
_diffrn_reflns_av_sigmaI/netI    0.0605
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            43530
_diffrn_reflns_theta_full        27.46
_diffrn_reflns_theta_max         27.46
_diffrn_reflns_theta_min         3.59
_exptl_absorpt_coefficient_mu    0.092
_exptl_absorpt_correction_T_max  0.9931
_exptl_absorpt_correction_T_min  0.9863
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.287
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             960
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.13
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.344
_refine_diff_density_min         -0.298
_refine_diff_density_rms         0.073
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.7(8)
_refine_ls_extinction_coef       0.035(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     302
_refine_ls_number_reflns         5310
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0589
_refine_ls_R_factor_gt           0.0406
_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^)+(0.0541P)^2^+0.0878P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0918
_refine_ls_wR_factor_ref         0.0998
_reflns_number_gt                4314
_reflns_number_total             5310
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b908600e.txt
_cod_data_source_block           compound4d
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               7150722