Oxetanyl Amino Acids for Peptidomimetics.
Möller, Guido P; Müller, Steffen; Wolfstädter, Bernd T; Wolfrum, Susanne; Schepmann, Dirk; Wünsch, Bernhard; Carreira, Erick M.; Organic letters 19 (2017) 2510–2513; doi:10.1021/acs.orglett.7b00745

data_1545907
_publ_section_title
;
 Oxetanyl Amino Acids for Peptidomimetics.
;
_journal_issue                   10
_journal_name_full               'Organic letters'
_journal_page_first              2510
_journal_page_last               2513
_journal_paper_doi               10.1021/acs.orglett.7b00745
_journal_volume                  19
_journal_year                    2017
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C14 H28 N2 O3 S'
_chemical_formula_sum            'C14 H28 N2 O3 S'
_chemical_formula_weight         304.44
_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   mixed
_atom_sites_solution_primary     direct
_audit_creation_date             2013-09-19
_audit_creation_method
;
Olex2 1.2
(compiled 2013.09.17 svn.r2790 for OlexSys, GUI svn.r4601)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.4302(4)
_cell_length_b                   15.9643(12)
_cell_length_c                   19.0144(14)
_cell_measurement_reflns_used    9562
_cell_measurement_temperature    100
_cell_measurement_theta_max      28.34
_cell_measurement_theta_min      2.49
_cell_volume                     1648.3(2)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    OLEX2
_computing_publication_material  OLEX2
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution
;
SHELX, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_diffrn_ambient_temperature      99.99
_diffrn_detector                 'Bruker APEX2 area detector'
_diffrn_detector_area_resol_mean 8.33
_diffrn_detector_type            'CCD area detector'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device       'kappa-stage diffractometer'
_diffrn_measurement_device_type  'Bruker Kappa Apex2 Duo'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_monochromator  'focusing graphite'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_xray_symbol    K-L~3~
_diffrn_reflns_av_R_equivalents  0.0267
_diffrn_reflns_av_unetI/netI     0.0100
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            53403
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.480
_diffrn_reflns_theta_min         2.142
_diffrn_source                   'sealed tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.206
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.6441
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2008/1 (Bruker,2008) was used for absorption correction.
wR2(int) was 0.0475 before and 0.0368 after correction.
The Ratio of minimum to maximum transmission is 0.8638.
The \l/2 correction factor is 0.0000.
;
_exptl_crystal_colour            'clear colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.227
_exptl_crystal_description       block
_exptl_crystal_F_000             664
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.376
_refine_diff_density_min         -0.193
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details
;
 Flack x determined using 1515 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   0.002(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.097
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     195
_refine_ls_number_reflns         3758
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.097
_refine_ls_R_factor_all          0.0284
_refine_ls_R_factor_gt           0.0268
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0461P)^2^+0.3604P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0723
_refine_ls_wR_factor_ref         0.0747
_reflns_Friedel_coverage         0.715
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.001
_reflns_number_gt                3629
_reflns_number_total             3758
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol7b00745_si_003.cif
_cod_data_source_block           mo_ca170913_0m
_cod_depositor_comments
'Adding full bibliography for 1545906--1545907.cif.'
_cod_database_code               1545907
_shelxl_version_number           2013-3
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups, All N(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2. Restrained distances
 N13-H13C = N13-H13D
 0.91 with sigma of 0.02
3.a Ternary CH refined with riding coordinates:
 C5(H5)
3.b Secondary CH2 refined with riding coordinates:
 C4(H4A,H4B), C12(H12A,H12B), C13(H13A,H13B)
3.c Aromatic/amide H refined with riding coordinates:
 N1(H1)
3.d Idealised Me refined as rotating group:
 C1(H1A,H1B,H1C), C7(H7A,H7B,H7C), C8(H8A,H8B,H8C), C9(H9A,H9B,H9C), C10(H10A,
 H10B,H10C), C14(H14A,H14B,H14C)
;