One-step synthesis of pyrido[1,2-a]benzimidazole derivatives by a novel multicomponent reaction of chloroacetonitrile, malononitrile, aromatic aldehyde, and pyridine.
Yan, Chao Guo; Wang, Qi Fang; Song, Xiao Kai; Sun, Jing; The Journal of organic chemistry 74 (2009) 710–718; doi:10.1021/jo802166t

data_4029494
_publ_section_title
;
 One-step synthesis of pyrido[1,2-a]benzimidazole derivatives by a novel
 multicomponent reaction of chloroacetonitrile, malononitrile, aromatic
 aldehyde, and pyridine.
;
_journal_issue                   2
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              710
_journal_page_last               718
_journal_paper_doi               10.1021/jo802166t
_journal_volume                  74
_journal_year                    2009
_chemical_formula_sum            'C32 H29 N5'
_chemical_formula_weight         483.60
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 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                 114.819(13)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   30.75(3)
_cell_length_b                   10.011(12)
_cell_length_c                   21.55(2)
_cell_measurement_temperature    296(2)
_cell_volume                     6021(11)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0365
_diffrn_reflns_av_sigmaI/netI    0.0324
_diffrn_reflns_limit_h_max       36
_diffrn_reflns_limit_h_min       -35
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            20911
_diffrn_reflns_theta_full        25.01
_diffrn_reflns_theta_max         25.01
_diffrn_reflns_theta_min         1.46
_exptl_absorpt_coefficient_mu    0.064
_exptl_absorpt_correction_T_max  0.9866
_exptl_absorpt_correction_T_min  0.9854
_exptl_crystal_density_diffrn    1.067
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             2048
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.21
_refine_diff_density_max         3.260
_refine_diff_density_min         -0.597
_refine_diff_density_rms         0.244
_refine_ls_extinction_coef       0.055(12)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   3.052
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     339
_refine_ls_number_reflns         5298
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      3.052
_refine_ls_R_factor_all          0.2448
_refine_ls_R_factor_gt           0.2321
_refine_ls_shift/su_max          1.064
_refine_ls_shift/su_mean         0.047
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.2000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.6113
_refine_ls_wR_factor_ref         0.6212
_reflns_number_gt                4281
_reflns_number_total             5298
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo802166t_si_001.cif
_cod_data_source_block           J2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_cell_volume        6020(12)
_cod_original_sg_symbol_Hall     -C2yc
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               4029494