Palladium-Catalyzed Intramolecular Cross-Dehydrogenative Coupling: Synthesis of Fused Imidazo[1,2-<i>a</i>]pyrimidines and Pyrazolo[1,5-<i>a</i>]pyrimidines.
Reddy Kotla, Siva K.; Vandavasi, Jaya Kishore; Wang, Jeh-Jeng; Parang, Keykavous; Tiwari, Rakesh K.; ACS omega 2 (2017) 11–19; doi:10.1021/acsomega.6b00417

data_4516831
_publ_section_title
;
 Palladium-Catalyzed Intramolecular Cross-Dehydrogenative Coupling:
 Synthesis of Fused Imidazo[1,2-<i>a</i>]pyrimidines and
 Pyrazolo[1,5-<i>a</i>]pyrimidines.
;
_journal_issue                   1
_journal_name_full               'ACS omega'
_journal_page_first              11
_journal_page_last               19
_journal_paper_doi               10.1021/acsomega.6b00417
_journal_volume                  2
_journal_year                    2017
_chemical_formula_moiety         'C23 H15 N3 O'
_chemical_formula_sum            'C23 H15 N3 O'
_chemical_formula_weight         349.38
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_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
_audit_update_record
;
2016-02-23 deposited with the CCDC.
2016-09-21 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.654(3)
_cell_length_b                   13.433(12)
_cell_length_c                   22.786(13)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_volume                     1731(2)
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1986)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_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  0.1462
_diffrn_reflns_av_sigmaI/netI    0.2519
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            9781
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.79
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  0.9992
_exptl_absorpt_correction_T_min  0.9735
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.341
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             728
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.227
_refine_diff_density_min         -0.339
_refine_diff_density_rms         0.065
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -3(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.987
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     244
_refine_ls_number_reflns         2954
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.987
_refine_ls_R_factor_all          0.2127
_refine_ls_R_factor_gt           0.0726
_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^)+(0.0375P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1086
_refine_ls_wR_factor_ref         0.1405
_reflns_number_gt                1286
_reflns_number_total             2954
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ao6b00417_si_002.cif
_cod_data_source_block           a14557a
_cod_database_code               4516831