Direct Transformation of N-protected α,β-Unsaturated γ-Amino Amides into γ-Lactams through a Base Mediated Molecular Rearrangement.
Ganesh Kumar, Mothukuri; Veeresh, Kuruva; Nalawade, Sachin A.; Nithun, Raj V.; Gopi, Hosahudya N.; The Journal of organic chemistry  (2019) –; doi:10.1021/acs.joc.9b01936

data_4036044
_publ_section_title
;
 Direct Transformation of N-protected \a,\b-Unsaturated \g-Amino Amides
 into \g-Lactams through a Base Mediated Molecular Rearrangement.
;
_journal_name_full               'The Journal of organic chemistry'
_journal_paper_doi               10.1021/acs.joc.9b01936
_journal_year                    2019
_chemical_formula_moiety         'C26 H31 N3 O3'
_chemical_formula_sum            'C26 H31 N3 O3'
_chemical_formula_weight         433.54
_space_group_crystal_system      triclinic
_space_group_IT_number           1
_space_group_name_Hall           'P 1'
_space_group_name_H-M_alt        'P 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90.029(2)
_cell_angle_beta                 89.977(2)
_cell_angle_gamma                90.011(2)
_cell_formula_units_Z            4
_cell_length_a                   6.8272(3)
_cell_length_b                   8.0949(3)
_cell_length_c                   42.0284(15)
_cell_measurement_reflns_used    9955
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      66.39
_cell_measurement_theta_min      4.21
_cell_volume                     2322.72(16)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.973
_diffrn_measured_fraction_theta_max 0.973
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0950
_diffrn_reflns_av_unetI/netI     0.1175
_diffrn_reflns_Laue_measured_fraction_full 0.973
_diffrn_reflns_Laue_measured_fraction_max 0.973
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       50
_diffrn_reflns_limit_l_min       -50
_diffrn_reflns_number            38679
_diffrn_reflns_point_group_measured_fraction_full 0.895
_diffrn_reflns_point_group_measured_fraction_max 0.895
_diffrn_reflns_theta_full        66.970
_diffrn_reflns_theta_max         66.970
_diffrn_reflns_theta_min         2.102
_exptl_absorpt_coefficient_mu    0.652
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.240
_exptl_crystal_description       rodshape
_exptl_crystal_F_000             1012
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.301
_refine_diff_density_min         -0.306
_refine_diff_density_rms         0.066
_refine_ls_abs_structure_details
;
 Flack x determined using 3324 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.2(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.263
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1165
_refine_ls_number_reflns         14782
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.263
_refine_ls_R_factor_all          0.1127
_refine_ls_R_factor_gt           0.0664
_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^)] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1056
_refine_ls_wR_factor_ref         0.1181
_reflns_Friedel_coverage         0.839
_reflns_Friedel_fraction_full    0.817
_reflns_Friedel_fraction_max     0.817
_reflns_number_gt                10018
_reflns_number_total             14782
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo9b01936_si_002.cif
_cod_data_source_block           2e
_cod_database_code               4036044
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              18998
_shelx_hkl_checksum              38649