Completely Stereocontrolled Aldol Reaction of Chiral β-Amino Acids.
Gazvoda, Martin; Höferl-Prantz, Kathrin; Barth, Roland; Felzmann, Wolfgang; Pevec, Andrej; Košmrlj, Janez; Organic letters 17 (2015) 512–515; doi:10.1021/ol503523h

data_1518646
_publ_section_title
;
 Completely Stereocontrolled Aldol Reaction of Chiral \b-Amino Acids.
;
_journal_issue                   3
_journal_name_full               'Organic letters'
_journal_page_first              512
_journal_page_last               515
_journal_paper_doi               10.1021/ol503523h
_journal_volume                  17
_journal_year                    2015
_chemical_formula_sum            'C34 H56 N2 O7 Si2'
_chemical_formula_weight         660.99
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.05200(10)
_cell_length_b                   19.8710(3)
_cell_length_c                   22.2031(3)
_cell_measurement_reflns_used    11780
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      74.4280
_cell_measurement_theta_min      3.9490
_cell_volume                     3993.72(9)
_computing_cell_refinement       'CrysAlis PRO (Agilent, 2011)'
_computing_data_collection       'CrysAlis PRO (Agilent, 2011)'
_computing_data_reduction        'CrysAlis PRO (Agilent, 2011)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
_diffrn_measurement_method       \w
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0325
_diffrn_reflns_av_unetI/netI     0.0265
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            26243
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        67.499
_diffrn_reflns_theta_max         67.499
_diffrn_reflns_theta_min         2.984
_diffrn_source                   'SuperNova (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    1.153
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(CrysAlis PRO; Agilent, 2011)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.101
_exptl_crystal_description       needle
_exptl_crystal_F_000             1436
_exptl_crystal_size_max          0.400
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.364
_refine_diff_density_min         -0.259
_refine_diff_density_rms         0.046
_refine_ls_abs_structure_details
;
 Flack x determined using 2575 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.002(12)
_refine_ls_extinction_coef       0.0004(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     452
_refine_ls_number_reflns         7197
_refine_ls_number_restraints     29
_refine_ls_restrained_S_all      1.092
_refine_ls_R_factor_all          0.0614
_refine_ls_R_factor_gt           0.0565
_refine_ls_shift/su_max          5.138
_refine_ls_shift/su_mean         0.035
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1195P)^2^+0.2170P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1630
_refine_ls_wR_factor_ref         0.1692
_reflns_Friedel_coverage         0.779
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                6467
_reflns_number_total             7197
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol503523h_si_002.cif
_cod_data_source_block           4b'
_cod_depositor_comments
'Adding full bibliography for 1518646--1518648.cif.'
_cod_database_code               1518646
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.656
_shelx_estimated_absorpt_t_max   0.893
_shelx_res_checksum              17605
_shelx_hkl_checksum              91575