Water-Stable Helical Structure of Tertiary Amides of Bicyclic β-Amino Acid Bearing 7-Azabicyclo[2.2.1]heptane. Full Control of Amide Cis-Trans Equilibrium by Bridgehead Substitution
Masahiro Hosoya; Yuko Otani; Masatoshi Kawahata; Kentaro Yamaguchi; Tomohiko Ohwada; Journal of the American Chemical Society 132 (2010) 14780–14789; doi:10.1021/ja1017877

data_4103342
_publ_section_title
;
 Water-Stable Helical Structure of Tertiary Amides of Bicyclic \b-Amino
 Acid Bearing 7-Azabicyclo[2.2.1]heptane. Full Control of Amide Cis-Trans
 Equilibrium by Bridgehead Substitution
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              14780
_journal_page_last               14789
_journal_paper_doi               10.1021/ja1017877
_journal_volume                  132
_journal_year                    2010
_chemical_absolute_configuration rm
_chemical_formula_moiety         'C24 H38 N2 O7'
_chemical_formula_sum            'C24 H38 N2 O7'
_chemical_formula_weight         466.56
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.1186(11)
_cell_length_b                   10.3890(11)
_cell_length_c                   23.513(3)
_cell_measurement_reflns_used    5911
_cell_measurement_temperature    120
_cell_measurement_theta_max      26.40
_cell_measurement_theta_min      2.62
_cell_volume                     2471.7(5)
_computing_cell_refinement       'Bruker APEX2'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker APEX2'
_computing_molecular_graphics    'ORTEP-3 for Windows'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  SHELXL-97
_computing_structure_solution    SHELXS-97
_diffrn_ambient_temperature      120
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.972
_diffrn_measurement_device_type  'Bruker APEX II CCD area detector'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0551
_diffrn_reflns_av_sigmaI/netI    0.0636
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            12060
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         26.66
_diffrn_reflns_theta_min         1.73
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.092
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.254
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             1008
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.199
_refine_diff_density_min         -0.210
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -1.4(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     304
_refine_ls_number_reflns         4942
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0433
_refine_ls_R_factor_gt           0.0402
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0441P)^2^+0.2457P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1018
_refine_ls_wR_factor_ref         0.1042
_reflns_number_gt                4594
_reflns_number_total             4942
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            ja1017877_si_002_4.cif
_cod_data_source_block           5-a0906231kwh
_cod_database_code               4103342