Aza-β^3^-cyclotetrapeptides
Arnaud Salaün; Clémence Mocquet; Romain Perochon; Aurélien Lecorgne; Barbara Le Grel; Michel Potel; Philippe Le Grel; Journal of Organic Chemistry 73 (2008) 8579–8582; doi:10.1021/jo8013963

data_4023799
_publ_section_title
;
 Aza-\b^3^-cyclotetrapeptides
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              8579
_journal_page_last               8582
_journal_paper_doi               10.1021/jo8013963
_journal_volume                  73
_journal_year                    2008
_chemical_formula_sum            'C13 H19 N3 O3'
_chemical_formula_weight         265.31
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_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                 106.398(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.8312(6)
_cell_length_b                   5.7747(3)
_cell_length_c                   17.3257(9)
_cell_measurement_temperature    293(2)
_cell_volume                     1423.51(12)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0836
_diffrn_reflns_av_sigmaI/netI    0.0507
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            13040
_diffrn_reflns_theta_full        26.01
_diffrn_reflns_theta_max         26.01
_diffrn_reflns_theta_min         3.55
_exptl_absorpt_coefficient_mu    0.089
_exptl_crystal_density_diffrn    1.238
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             568
_refine_diff_density_max         0.190
_refine_diff_density_min         -0.264
_refine_diff_density_rms         0.048
_refine_ls_extinction_coef       0.045(8)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.086
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     189
_refine_ls_number_reflns         2780
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.086
_refine_ls_R_factor_all          0.0797
_refine_ls_R_factor_gt           0.0596
_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^)+(0.0776P)^2^+0.4121P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1470
_refine_ls_wR_factor_ref         0.1641
_reflns_number_gt                2085
_reflns_number_total             2780
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo8013963_si_005.cif
_cod_data_source_block           import
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               4023799