Hydrated ferric sulfate catalyzed synthesis of 5,6-unsubstituted 1,4-dihydropyridines using three-component reaction
Islam, Kobirul; Das, Deb K.; Khan, Abu T.; Tetrahedron Letters 55 (2014) 5613–5617; doi:10.1016/j.tetlet.2014.08.067

data_1517787
_publ_section_title
;
 Hydrated ferric sulfate catalyzed synthesis of 5,6-unsubstituted
 1,4-dihydropyridines using three-component reaction
;
_journal_issue                   41
_journal_name_full               'Tetrahedron Letters'
_journal_page_first              5613
_journal_page_last               5617
_journal_paper_doi               10.1016/j.tetlet.2014.08.067
_journal_volume                  55
_journal_year                    2014
_chemical_absolute_configuration racemic
_chemical_formula_moiety         'C21 H21 N O2'
_chemical_formula_sum            'C21 H21 N O2'
_chemical_formula_weight         319.39
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 96.185(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.2797(8)
_cell_length_b                   7.6305(5)
_cell_length_c                   12.3433(9)
_cell_measurement_temperature    296(2)
_cell_volume                     868.93(11)
_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      296(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0413
_diffrn_reflns_av_sigmaI/netI    0.0447
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            11581
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.66
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_T_max  0.986
_exptl_absorpt_correction_T_min  0.981
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.221
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             340
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.504
_refine_diff_density_min         -0.290
_refine_diff_density_rms         0.077
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   2(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.147
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     219
_refine_ls_number_reflns         2865
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.147
_refine_ls_R_factor_all          0.1072
_refine_ls_R_factor_gt           0.0903
_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^)+(0.1496P)^2^+0.5401P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2634
_refine_ls_wR_factor_ref         0.2762
_reflns_number_gt                2244
_reflns_number_total             2865
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            4a.cif
_cod_data_source_block           ki-dhp-1
_cod_database_code               1517787