An unexpected re-arrangement of the antibiotic carbapenem core to new 1,4-diazepin-5-one scaffolds
Peters, Byron K.; Razuwika, Rufaro; Samipillai, Marivel; Arvidsson, Per I.; Kruger, Hendrik G.; Govender, Thavendran; Naicker, Tricia; RSC Advances 8 (2018) 190–; doi:10.1039/C7RA12688C

data_7229763
_publ_section_title
;
 An unexpected re-arrangement of the antibiotic carbapenem core to new
 1,4-diazepin-5-one scaffolds
;
_journal_issue                   1
_journal_name_full               'RSC Advances'
_journal_page_first              190
_journal_paper_doi               10.1039/C7RA12688C
_journal_volume                  8
_journal_year                    2018
_chemical_absolute_configuration syn
_chemical_formula_sum            'C19 H24 N2 O5'
_chemical_formula_weight         360.40
_chemical_name_systematic
'(2R,6aR,11aS)-methyl 7-methyl-8-oxo-4-(1-phenylethyl) 1H,4-diazabicyclo[5.4.0]undec- 5,9-dione carboxylate'
_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
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2017-01-18 deposited with the CCDC.
2017-12-13 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.0492(4)
_cell_length_b                   10.1001(8)
_cell_length_c                   35.494(3)
_cell_measurement_reflns_used    4314
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28.344
_cell_measurement_theta_min      1.147
_cell_volume                     1810.1(3)
_computing_cell_refinement       'SAINT-plus (Bruker, 2008)'
_computing_data_collection       'APEX2 (Bruker, 2008)'
_computing_data_reduction        'SAINT-Plus and XPREP (Bruker, 2008)'
_computing_molecular_graphics    ORTEP-3
_computing_publication_material  ORTEP-3
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker Smart ApexII CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0260
_diffrn_reflns_av_unetI/netI     0.0134
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       47
_diffrn_reflns_limit_l_min       -47
_diffrn_reflns_number            37827
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.344
_diffrn_reflns_theta_min         1.147
_exptl_absorpt_coefficient_mu    0.096
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.322
_exptl_crystal_description       block
_exptl_crystal_F_000             768
_exptl_crystal_size_max          0.380
_exptl_crystal_size_mid          0.370
_exptl_crystal_size_min          0.180
_refine_diff_density_max         0.276
_refine_diff_density_min         -0.190
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details
;
 Flack x determined using 1694 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.00(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.080
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     239
_refine_ls_number_reflns         4512
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.080
_refine_ls_R_factor_all          0.0427
_refine_ls_R_factor_gt           0.0405
_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^)+(0.0626P)^2^+0.3899P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1097
_refine_ls_wR_factor_ref         0.1116
_reflns_Friedel_coverage         0.701
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.997
_reflns_number_gt                4314
_reflns_number_total             4512
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7ra12688c2.cif
_cod_data_source_block           p212121
_cod_original_cell_volume        1810.1(2)
_cod_database_code               7229763
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.964
_shelx_estimated_absorpt_t_max   0.983
_shelx_res_checksum              6121