Catalyst-free preparation of 1,2,4,5-tetrasubstituted imidazoles from a novel unexpected domino reaction of 2-azido acrylates and nitrones.
Hu, Bao; Wang, Zhao; Ai, Ning; Zheng, Jie; Liu, Xing-Hai; Shan, Shang; Wang, Zhongwen; Organic letters 13 (2011) 6362–6365; doi:10.1021/ol202650z

data_1502586
_publ_section_title
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 Catalyst-free preparation of 1,2,4,5-tetrasubstituted imidazoles from a
 novel unexpected domino reaction of 2-azido acrylates and nitrones.
;
_journal_issue                   24
_journal_name_full               'Organic letters'
_journal_page_first              6362
_journal_page_last               6365
_journal_paper_doi               10.1021/ol202650z
_journal_volume                  13
_journal_year                    2011
_chemical_formula_sum            'C24 H20 N2 O2'
_chemical_formula_weight         368.42
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                95.763(10)
_cell_angle_beta                 92.756(10)
_cell_angle_gamma                98.775(13)
_cell_formula_units_Z            4
_cell_length_a                   8.797(4)
_cell_length_b                   9.896(5)
_cell_length_c                   22.154(11)
_cell_measurement_reflns_used    6156
_cell_measurement_temperature    113(2)
_cell_measurement_theta_max      28.2
_cell_measurement_theta_min      1.9
_cell_volume                     1892.5(16)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalClear
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'CrystalStructure 3.8'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      113(2)
_diffrn_detector_area_resol_mean 14.22
_diffrn_measured_fraction_theta_full 0.983
_diffrn_measured_fraction_theta_max 0.983
_diffrn_measurement_device_type  'Rigaku Saturn724 CCD'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_monochromator  multilayer
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0635
_diffrn_reflns_av_sigmaI/netI    0.1546
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            19832
_diffrn_reflns_theta_full        27.91
_diffrn_reflns_theta_max         27.91
_diffrn_reflns_theta_min         1.85
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.9868
_exptl_absorpt_correction_T_min  0.9836
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   CrystalClear
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.293
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             776
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.349
_refine_diff_density_min         -0.393
_refine_diff_density_rms         0.079
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.063
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     507
_refine_ls_number_reflns         8895
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.063
_refine_ls_R_factor_all          0.0975
_refine_ls_R_factor_gt           0.0420
_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^)+(0.0100P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0759
_refine_ls_wR_factor_ref         0.1015
_reflns_number_gt                3429
_reflns_number_total             8895
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol202650z_si_002.cif
_cod_data_source_block           shelx
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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      P-1
_cod_database_code               1502586