Silver-catalyzed regioselective synthesis of pyrano heterocycles: a versatile route to samoquasine A derivatives.
Chahal, Kapil; Badhavath, Ravikumar; Matharu, Simran Kaur; Vinod, Anjana; Vani, Damera; Potluri, Vijaya Rani; Sridhar, Balasubramanian; Reddy, Kallu Rajender; Organic & biomolecular chemistry 22 (2024) 8898–8903; doi:10.1039/d4ob01446d

data_7160178
_publ_section_title
;
 Silver-catalyzed regioselective synthesis of pyrano heterocycles: a
 versatile route to samoquasine A derivatives.
;
_journal_issue                   45
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              8898
_journal_page_last               8903
_journal_paper_doi               10.1039/d4ob01446d
_journal_volume                  22
_journal_year                    2024
_chemical_formula_moiety         'C19 H14 N2 O'
_chemical_formula_sum            'C19 H14 N2 O'
_chemical_formula_weight         286.32
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2019/2
_audit_update_record
;
2024-01-30 deposited with the CCDC.	2024-10-08 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 92.710(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.9636(5)
_cell_length_b                   17.0485(10)
_cell_length_c                   10.3861(7)
_cell_measurement_reflns_used    7184
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      30.3095
_cell_measurement_theta_min      2.298
_cell_volume                     1408.52(15)
_computing_cell_refinement       '<i>SAINT</i> (Bruker, 2016)'
_computing_data_collection       '<i>APEX3</i> (Bruker, 2016)'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      294(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.957
_diffrn_measurement_device_type  'Bruker D8 QUEST PHOTON-100'
_diffrn_measurement_method       '\w and \f'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0541
_diffrn_reflns_av_unetI/netI     0.0484
_diffrn_reflns_Laue_measured_fraction_full 0.993
_diffrn_reflns_Laue_measured_fraction_max 0.957
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            22983
_diffrn_reflns_point_group_measured_fraction_full 0.993
_diffrn_reflns_point_group_measured_fraction_max 0.957
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.511
_diffrn_reflns_theta_min         2.560
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_T_max  0.7461
_exptl_absorpt_correction_T_min  0.6944
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 SADABS 2016/2: Krause, L., Herbst-Irmer, R., Sheldrick G.M. & Stalke D.,
 J. Appl. Cryst. 48 (2015) 3-10
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.350
_exptl_crystal_description       block
_exptl_crystal_F_000             600
_exptl_crystal_size_max          0.230
_exptl_crystal_size_mid          0.210
_exptl_crystal_size_min          0.160
_refine_diff_density_max         0.240
_refine_diff_density_min         -0.164
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         4119
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0989
_refine_ls_R_factor_gt           0.0548
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0633P)^2^+0.2643P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1273
_refine_ls_wR_factor_ref         0.1544
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2582
_reflns_number_total             4119
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d4ob01446d2.cif
_cod_data_source_block           KB1225_0m
_cod_depositor_comments          'Adding full bibliography for 7160178.cif.'
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7160178
_shelx_shelxl_version_number     2019/2
_shelx_estimated_absorpt_t_min   0.981
_shelx_estimated_absorpt_t_max   0.987
_shelx_res_checksum              94223