Synthetic route to chiral tetrahydroquinoxalines via ring-opening of activated aziridines.
Ghorai, Manas K.; Sahoo, Ashis K.; Kumar, Sarvesh; Organic letters 13 (2011) 5972–5975; doi:10.1021/ol2023906

data_1502537
_publ_section_title
;
 Synthetic route to chiral tetrahydroquinoxalines via ring-opening of
 activated aziridines.
;
_journal_issue                   22
_journal_name_full               'Organic letters'
_journal_page_first              5972
_journal_page_last               5975
_journal_paper_doi               10.1021/ol2023906
_journal_volume                  13
_journal_year                    2011
_chemical_formula_sum            'C20 H21 N2 O2 S'
_chemical_formula_weight         353.45
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_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_creation_method           SHELXL-97
_cell_angle_alpha                90.000(5)
_cell_angle_beta                 90.000(5)
_cell_angle_gamma                90.000(5)
_cell_formula_units_Z            4
_cell_length_a                   9.010(5)
_cell_length_b                   12.674(5)
_cell_length_c                   15.667(5)
_cell_measurement_temperature    293(2)
_cell_volume                     1789.1(13)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.985
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0458
_diffrn_reflns_av_sigmaI/netI    0.0517
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            11450
_diffrn_reflns_theta_full        28.35
_diffrn_reflns_theta_max         28.35
_diffrn_reflns_theta_min         2.07
_exptl_absorpt_coefficient_mu    0.197
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.312
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             748
_exptl_crystal_size_max          0.097
_exptl_crystal_size_mid          0.071
_exptl_crystal_size_min          0.045
_refine_diff_density_max         1.803
_refine_diff_density_min         -1.049
_refine_diff_density_rms         0.225
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.2(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.095
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     228
_refine_ls_number_reflns         4304
_refine_ls_number_restraints     12
_refine_ls_restrained_S_all      1.102
_refine_ls_R_factor_all          0.1186
_refine_ls_R_factor_gt           0.0871
_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^)+(0.1565P)^2^+6.3648P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2279
_refine_ls_wR_factor_ref         0.2980
_reflns_number_gt                3628
_reflns_number_total             4304
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol2023906_si_002.cif
_cod_data_source_block           7d
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P2(1)2(1)2(1) '
_cod_database_code               1502537