Unprecedented regiochemical control in the formation of aryl[1,2-a]imidazopyridines from alkynyliodonium salts: mechanistic insights.
Dixon, Luke I.; Carroll, Michael A.; Gregson, Thomas J.; Ellames, George J.; Harrington, Ross W.; Clegg, William; Organic & biomolecular chemistry 11 (2013) 5877–5884; doi:10.1039/c3ob41112e

data_7153052
_publ_section_title
;
 Unprecedented regiochemical control in the formation of
 aryl[1,2-a]imidazopyridines from alkynyliodonium salts: mechanistic
 insights.
;
_journal_issue                   35
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              5877
_journal_page_last               5884
_journal_paper_doi               10.1039/c3ob41112e
_journal_volume                  11
_journal_year                    2013
_chemical_formula_moiety         'C13 H11 N2 +,Cl -,2 H2 O'
_chemical_formula_sum            'C13 H15 Cl N2 O2'
_chemical_formula_weight         266.72
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 101.751(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.2615(9)
_cell_length_b                   7.2071(6)
_cell_length_c                   16.8121(15)
_cell_measurement_reflns_used    3286
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      29.45
_cell_measurement_theta_min      2.77
_cell_volume                     1335.9(2)
_computing_cell_refinement
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.34d (release 27-02-2009 CrysAlis171 .NET)
(compiled Feb 27 2009,15:38:38)
;
_computing_data_collection
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.34d (release 27-02-2009 CrysAlis171 .NET)
(compiled Feb 27 2009,15:38:38)
;
_computing_data_reduction
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.34d (release 27-02-2009 CrysAlis171 .NET)
(compiled Feb 27 2009,15:38:38)
;
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL and local programs'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 10.3968
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.851
_diffrn_measurement_device_type
'Oxford Diffraction Gemini A Ultra diffractometer'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  none
_diffrn_radiation_source         'sealed tube with Enhance optics'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0281
_diffrn_reflns_av_sigmaI/netI    0.0536
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            7628
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         29.52
_diffrn_reflns_theta_min         3.09
_exptl_absorpt_coefficient_mu    0.282
_exptl_absorpt_correction_T_max  0.946
_exptl_absorpt_correction_T_min  0.920
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.34d (release 27-02-2009 CrysAlis171 .NET)
(compiled Feb 27 2009,15:38:38)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.326
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             560
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.344
_refine_diff_density_min         -0.301
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     178
_refine_ls_number_reflns         3170
_refine_ls_number_restraints     7
_refine_ls_restrained_S_all      1.043
_refine_ls_R_factor_all          0.0643
_refine_ls_R_factor_gt           0.0393
_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^)+(0.0507P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0958
_refine_ls_wR_factor_ref         0.1002
_reflns_number_gt                2167
_reflns_number_total             3170
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c3ob41112e.txt
_cod_data_source_block           mac67_4a.HCl.2H2O
_cod_original_cell_volume        1335.92(19)
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7153052