Cooperative Intramolecular Hydrogen Bonding Strongly Enforces cis-Peptoid Folding
Wijaya, Andrew W.; Nguyen, Andy I.; Roe, Leah T.; Butterfoss, Glenn L.; Spencer, Ryan K.; Li, Nan K.; Zuckermann, Ronald N.; Journal of the American Chemical Society  (2019) –; doi:10.1021/jacs.9b10497

data_4132343
_publ_section_title
;
 Cooperative Intramolecular Hydrogen Bonding Strongly Enforces cis-Peptoid
 Folding
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.9b10497
_journal_year                    2019
_chemical_formula_moiety         'C18 H36 N3 O2, C24 H20 B'
_chemical_formula_sum            'C42 H56 B N3 O2'
_chemical_formula_weight         645.70
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 91.6951(3)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   11.65875(4)
_cell_length_b                   27.05947(10)
_cell_length_c                   23.62363(9)
_cell_measurement_reflns_used    116545
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      78.9410
_cell_measurement_theta_min      3.2230
_cell_volume                     7449.51(5)
_computing_cell_refinement       'CrysAlisPro 1.171.39.46e (Rigaku OD, 2018)'
_computing_data_collection       'CrysAlisPro 1.171.39.46e (Rigaku OD, 2018)'
_computing_data_reduction        'CrysAlisPro 1.171.39.46e (Rigaku OD, 2018)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'ROD, Synergy Custom DW system, Pilatus 200K'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0406
_diffrn_reflns_av_unetI/netI     0.0296
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       33
_diffrn_reflns_limit_k_min       -33
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            151130
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        74.000
_diffrn_reflns_theta_max         74.504
_diffrn_reflns_theta_min         3.266
_diffrn_source                   'Rotating-anode X-ray tube'
_exptl_absorpt_coefficient_mu    0.535
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.11852
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.151
_exptl_crystal_description       block
_exptl_crystal_F_000             2800
_exptl_crystal_size_max          0.440
_exptl_crystal_size_mid          0.130
_exptl_crystal_size_min          0.080
_refine_diff_density_max         0.498
_refine_diff_density_min         -0.241
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.39(12)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1750
_refine_ls_number_reflns         30421
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          0.0379
_refine_ls_R_factor_gt           0.0373
_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^)+(0.0631P)^2^+1.3158P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0975
_refine_ls_wR_factor_ref         0.0979
_reflns_Friedel_coverage         0.957
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                29807
_reflns_number_total             30421
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja9b10497_si_003.cif
_cod_data_source_block           AIN_3_62
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               4132343
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.799
_shelx_estimated_absorpt_t_max   0.958
_shelx_res_checksum              21154
_shelx_hkl_checksum              29911