The Strecker reaction coupled to Viedma ripening: a simple route to highly hindered enantiomerically pure amino acids.
Baglai, Iaroslav; Leeman, Michel; Wurst, Klaus; Kaptein, Bernard; Kellogg, Richard M.; Noorduin, Willem L.; Chemical communications (Cambridge, England) 54 (2018) 10832–10834; doi:10.1039/c8cc06658b

data_7122243
_publ_section_title
;
 The Strecker reaction coupled to Viedma ripening: a simple route to
 highly hindered enantiomerically pure amino acids.
;
_journal_issue                   77
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              10832
_journal_page_last               10834
_journal_paper_doi               10.1039/c8cc06658b
_journal_volume                  54
_journal_year                    2018
_chemical_absolute_configuration unk
_chemical_formula_sum            'C18 H20 N2 O'
_chemical_formula_weight         280.36
_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
_audit_update_record
;
2018-05-24 deposited with the CCDC.
2018-08-24 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.9479(5)
_cell_length_b                   12.3654(11)
_cell_length_c                   21.1408(18)
_cell_measurement_reflns_used    9947
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.0
_cell_measurement_theta_min      2.5
_cell_volume                     1554.9(2)
_computing_cell_refinement       'Bruker SAINT-V 8.34A'
_computing_data_collection       'Bruker Apex III'
_computing_data_reduction        'Bruker SAINT-V 8.34A'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXTL-XT-2014/4 (Bruker AXS, 2014)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 10.4
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker D8 QUEST PHOTON 100'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'multi layered optics'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0381
_diffrn_reflns_av_unetI/netI     0.0183
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            25831
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        24.999
_diffrn_reflns_theta_max         24.999
_diffrn_reflns_theta_min         2.535
_diffrn_source                   'Incoatec Microfocus'
_exptl_absorpt_coefficient_mu    0.075
_exptl_absorpt_correction_T_max  0.990
_exptl_absorpt_correction_T_min  0.975
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS-2014/5)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.198
_exptl_crystal_description       prism
_exptl_crystal_F_000             600
_exptl_crystal_size_max          0.180
_exptl_crystal_size_mid          0.130
_exptl_crystal_size_min          0.110
_refine_diff_density_max         0.160
_refine_diff_density_min         -0.133
_refine_diff_density_rms         0.031
_refine_ls_abs_structure_details
;
 Flack x determined using 952 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.4(5)
_refine_ls_extinction_coef       0.032(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   1.069
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     192
_refine_ls_number_reflns         2729
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.069
_refine_ls_R_factor_all          0.0352
_refine_ls_R_factor_gt           0.0299
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0393P)^2^+0.1630P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0708
_refine_ls_wR_factor_ref         0.0730
_reflns_Friedel_coverage         0.698
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                2476
_reflns_number_total             2729
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8cc06658b2.cif
_cod_data_source_block           7b
_cod_depositor_comments
'Adding full bibliography for 7122242--7122244.cif.'
_cod_database_code               7122243
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.987
_shelx_estimated_absorpt_t_max   0.992
_shelx_res_checksum              50711