Substrate Control in Enantioselective and Diastereoselective Aldol Reaction by Memory of Chirality: A Rapid Access to Enantiopure β-Hydroxy Quaternary α-Amino Acids.
Viswambharan, Baby; Gori, Didier; Guillot, Régis; Kouklovsky, Cyrille; Alezra, Valérie; Organic letters 16 (2014) 788–791; doi:10.1021/ol403523e

data_1513457
_publ_section_title
;
 Substrate Control in Enantioselective and Diastereoselective Aldol
 Reaction by Memory of Chirality: A Rapid Access to Enantiopure \b-Hydroxy
 Quaternary \a-Amino Acids.
;
_journal_issue                   3
_journal_name_full               'Organic letters'
_journal_page_first              788
_journal_page_last               791
_journal_paper_doi               10.1021/ol403523e
_journal_volume                  16
_journal_year                    2014
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C24 H22 Br N O4'
_chemical_formula_sum            'C24 H22 Br N O4'
_chemical_formula_weight         468.34
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      4
_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                 99.8190(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.9229(3)
_cell_length_b                   10.8841(3)
_cell_length_c                   9.9414(3)
_cell_measurement_reflns_used    9009
_cell_measurement_temperature    100(1)
_cell_measurement_theta_max      32.44
_cell_measurement_theta_min      2.68
_cell_volume                     1057.96(5)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(1)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.926
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w 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  0.0226
_diffrn_reflns_av_sigmaI/netI    0.0445
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            17426
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         32.82
_diffrn_reflns_theta_min         2.08
_diffrn_source                   'fine-focus sealed tube'
_diffrn_source_type              'kappa X8 APEX II Bruker ICMMO'
_exptl_absorpt_coefficient_mu    1.973
_exptl_absorpt_correction_T_max  0.7116
_exptl_absorpt_correction_T_min  0.5873
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.470
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       bloc
_exptl_crystal_F_000             480
_exptl_crystal_size_max          0.31
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.451
_refine_diff_density_min         -0.567
_refine_diff_density_rms         0.053
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.004(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     275
_refine_ls_number_reflns         5800
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0309
_refine_ls_R_factor_gt           0.0264
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0197P)^2^+0.0509P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0609
_refine_ls_wR_factor_ref         0.0625
_reflns_number_gt                5274
_reflns_number_total             5800
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol403523e_si_001.cif
_cod_data_source_block           6a
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               1513457