Carboxamide versus Sulfonamide in Peptide Backbone Folding: A Case Study with a Hetero Foldamer
Ramesh, Veera V. E.; Kale, Sangram S.; Kotmale, Amol S.; Gawade, Rupesh L.; Puranik, Vedavati G.; Rajamohanan, P. R.; Sanjayan, Gangadhar J.; Organic Letters 15 (2013) 1504–; doi:10.1021/ol4002762

data_1511871
_publ_section_title
;
 Carboxamide versus Sulfonamide in Peptide Backbone Folding: A Case Study
 with a Hetero Foldamer
;
_journal_issue                   7
_journal_name_full               'Organic Letters'
_journal_page_first              1504
_journal_paper_doi               10.1021/ol4002762
_journal_volume                  15
_journal_year                    2013
_chemical_formula_moiety         'C21 H31 N3 O7 S'
_chemical_formula_sum            'C21 H31 N3 O7 S'
_chemical_formula_weight         469.55
_chemical_melting_point          371.1(10)
_chemical_name_common            Peptide
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 98.801(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.677(3)
_cell_length_b                   12.585(4)
_cell_length_c                   11.434(4)
_cell_measurement_reflns_used    3750
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      28.00
_cell_measurement_theta_min      2.38
_cell_volume                     1233.9(7)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL,PyMOL and PLATON'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.975
_diffrn_measured_fraction_theta_max 0.975
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_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  0.0314
_diffrn_reflns_av_sigmaI/netI    0.0405
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            5668
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.80
_exptl_absorpt_coefficient_mu    0.175
_exptl_absorpt_correction_T_max  0.9827
_exptl_absorpt_correction_T_min  0.9302
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.264
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             500
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.223
_refine_diff_density_min         -0.130
_refine_diff_density_rms         0.028
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.05(7)
_refine_ls_extinction_coef       0.006(2)
_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   1.041
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     296
_refine_ls_number_reflns         2984
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0328
_refine_ls_R_factor_gt           0.0305
_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^)+(0.0489P)^2^+0.0994P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0845
_refine_ls_wR_factor_ref         0.0867
_reflns_number_gt                2813
_reflns_number_total             2984
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol4002762_si_002.cif
_cod_data_source_block           C21H31N3O7Scompound2a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '97-99degree centigrade' was changed
to '371.1(10)' - it was converted from degrees Celsius(C) to
Kelvins(K), the average value was taken and precision was
estimated.

'_symmetry_cell_setting' value 'Monoclinic' changed to
'monoclinic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      P21
_cod_database_code               1511871