Proline-Catalyzed Diastereoselective Direct Aldol Reaction between 4-Oxoazetidine-2-carbaldehydes and Ketones
Benito Alcaide; Pedro Almendros; Amparo Luna; M. Rosario Torres; Journal of Organic Chemistry 71 (2006) 4818–4822; doi:10.1021/jo0604235

data_4021761
_publ_section_title
;
 Proline-Catalyzed Diastereoselective Direct Aldol Reaction
 between 4-Oxoazetidine-2-carbaldehydes and Ketones
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              4818
_journal_page_last               4822
_journal_paper_doi               10.1021/jo0604235
_journal_volume                  71
_journal_year                    2006
_chemical_formula_sum            'C22 H23 N O5'
_chemical_formula_weight         381.41
_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                 119.223(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   13.592(2)
_cell_length_b                   5.9800(9)
_cell_length_c                   13.892(2)
_cell_measurement_temperature    293(2)
_cell_volume                     985.4(3)
_computing_cell_refinement       'Bruker XSCANS'
_computing_data_collection       'Bruker XSCANS'
_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 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker P4'
_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  0.0826
_diffrn_reflns_av_sigmaI/netI    0.1595
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            7610
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.68
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.285
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             404
_exptl_crystal_size_max          0.43
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.182
_refine_diff_density_min         -0.172
_refine_diff_density_rms         0.041
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0(2)
_refine_ls_extinction_coef       0.010(2)
_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   0.825
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     256
_refine_ls_number_reflns         3428
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.825
_refine_ls_R_factor_all          0.1520
_refine_ls_R_factor_gt           0.0517
_refine_ls_shift/su_max          0.100
_refine_ls_shift/su_mean         0.004
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0429P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1010
_refine_ls_wR_factor_ref         0.1264
_reflns_number_gt                1451
_reflns_number_total             3428
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo0604235si20060228_060459.cif
_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_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               4021761