Enantioselective spirocyclizations from tryptophanol-derived oxazolopiperidone lactams.
Amat, Mercedes; Santos, Maria M. M.; Gómez, Antonia M; Jokic, Danica; Molins, Elies; Bosch, Joan; Organic letters 9 (2007) 2907–2910; doi:10.1021/ol0712327

data_1505470
_publ_section_title
;
 Enantioselective spirocyclizations from tryptophanol-derived
 oxazolopiperidone lactams.
;
_journal_issue                   15
_journal_name_full               'Organic letters'
_journal_page_first              2907
_journal_page_last               2910
_journal_paper_doi               10.1021/ol0712327
_journal_volume                  9
_journal_year                    2007
_chemical_absolute_configuration ad
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C22 H25 N2 O2'
_chemical_formula_sum            'C23 H26 N2 O4 S'
_chemical_formula_weight         426.52
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      19
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.2
_audit_creation_date             2004-11-02T15:09:25-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.055(2)
_cell_length_b                   10.084(2)
_cell_length_c                   20.606(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      18.4
_cell_measurement_theta_min      11.3
_cell_measurement_wavelength     0.71073
_cell_volume                     2089.3(6)
_computing_cell_refinement       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_collection       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      294(2)
_diffrn_detector                 'scintillation LiI'
_diffrn_detector_dtime           1.195
_diffrn_measured_fraction_theta_full 1
_diffrn_measured_fraction_theta_max 1
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'Enraf Nonius CAD4'
_diffrn_measurement_method       'non-profiled omega scans'
_diffrn_orient_matrix_type
;
  x-axis points to radiation source
  the matrix is specified in reciprocal space
;
_diffrn_orient_matrix_UB_11      0.098488
_diffrn_orient_matrix_UB_12      -0.007406
_diffrn_orient_matrix_UB_13      0.005841
_diffrn_orient_matrix_UB_21      -0.013896
_diffrn_orient_matrix_UB_22      -0.038549
_diffrn_orient_matrix_UB_23      0.044173
_diffrn_orient_matrix_UB_31      -0.002123
_diffrn_orient_matrix_UB_32      -0.091074
_diffrn_orient_matrix_UB_33      -0.019207
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0236
_diffrn_reflns_av_unetI/netI     0.0309
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            3970
_diffrn_reflns_theta_full        24.97
_diffrn_reflns_theta_max         24.97
_diffrn_reflns_theta_min         1.98
_diffrn_source                   'Enraf Nonius FR590'
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  60
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.188
_exptl_absorpt_correction_T_max  0.9814
_exptl_absorpt_correction_T_min  0.9423
_exptl_absorpt_correction_type   refdelf
_exptl_absorpt_process_details
;
        (See: Walker, N. & Stuart, D. (1983) Acta Cryst. A39, 158-166)
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.356
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             904
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.155
_refine_diff_density_min         -0.177
_refine_diff_density_rms         0.032
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.14(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.076
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     273
_refine_ls_number_reflns         3655
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.076
_refine_ls_R_factor_all          0.0584
_refine_ls_R_factor_gt           0.0377
_refine_ls_shift/su_max          0.107
_refine_ls_shift/su_mean         0.003
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0475P)^2^+0.3069P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0898
_refine_ls_wR_factor_ref         0.0991
_reflns_number_gt                3015
_reflns_number_total             3655
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol0712327-file003.cif
_cod_data_source_block           jb42
_cod_database_code               1505470
_diffrn_standards_decay_corr_max 1
_diffrn_standards_decay_corr_min 1