Entrapment and Kinetic Resolution of Stabilized Axial and Equatorial Conformers of Spiro-β-lactams
Naveen Anand; Bhahwal A. Shah; Munish Kapoor; Rajinder Parshad; Rattan L. Sharma; Maninder S. Hundal; Ajay P. S. Pannu; Prasad V. Bharatam; Subhash C. Taneja; Journal of Organic Chemistry 76 (2011) 5999–6006; doi:10.1021/jo200363x

data_4026468
_publ_section_title
;
 Entrapment and Kinetic Resolution of Stabilized Axial and Equatorial
 Conformers of Spiro-\b-lactams
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              5999
_journal_page_last               6006
_journal_paper_doi               10.1021/jo200363x
_journal_volume                  76
_journal_year                    2011
_chemical_formula_moiety         'C18 H23 N O4'
_chemical_formula_sum            'C18 H23 N O4'
_chemical_formula_weight         317.37
_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                 104.05
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.7290(10)
_cell_length_b                   13.881(2)
_cell_length_c                   13.3770(10)
_cell_measurement_reflns_used    53
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      20
_cell_measurement_theta_min      12
_cell_volume                     1752.5(3)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'SHELXTL-PC (Sheldrick, 1993)'
_computing_molecular_graphics
'ORTEP,Mercury(Farrugia,1997;Bruno et.al.,2002)'
_computing_publication_material  'WINGX,(Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR-92 (Altamore et. al., 1992)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Siemens p4 diffractometer'
_diffrn_measurement_method       theta-2theta
_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  0.0189
_diffrn_reflns_av_sigmaI/netI    0.0557
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            3276
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         2.15
_diffrn_standards_interval_count 50
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.203
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.159
_refine_diff_density_min         -0.179
_refine_diff_density_rms         0.046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     208
_refine_ls_number_reflns         3085
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.1223
_refine_ls_R_factor_gt           0.0584
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0881P)^2^+0.0763P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1515
_refine_ls_wR_factor_ref         0.1901
_reflns_number_gt                1656
_reflns_number_total             3085
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo200363x_si_2a.cif
_cod_data_source_block           methyl1
_cod_database_code               4026468