DABCO catalyzed domino Michael/hydroalkoxylation reaction involving α-alkynyl-β-aryl nitroolefins: excellent stereoselective access to dihydropyrano[3,2-c]chromenes, pyranonaphthoquinones and related heterocycles.
Biswas, Soumen; Dagar, Anuradha; Mobin, Shaikh M.; Samanta, Sampak; Organic & biomolecular chemistry 14 (2016) 1940–1945; doi:10.1039/c5ob02400e

data_7154878
_publ_section_title
;
 DABCO catalyzed domino Michael/hydroalkoxylation reaction involving
 \a-alkynyl-\b-aryl nitroolefins: excellent stereoselective access to
 dihydropyrano[3,2-c]chromenes, pyranonaphthoquinones and related
 heterocycles.
;
_journal_issue                   6
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              1940
_journal_page_last               1945
_journal_paper_doi               10.1039/c5ob02400e
_journal_volume                  14
_journal_year                    2016
_chemical_formula_sum            'C22 H18 F N O4'
_chemical_formula_weight         379.39
_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'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2015-11-19 deposited with the CCDC.
2016-01-07 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 100.859(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.3205(3)
_cell_length_b                   26.2500(10)
_cell_length_c                   8.5535(3)
_cell_measurement_reflns_used    5843
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      30.7720
_cell_measurement_theta_min      3.8960
_cell_volume                     1834.74(12)
_computing_cell_refinement       'CrysAlis RED, Oxford Diffraction Ltd.,'
_computing_data_collection       'CrysAlis CCD, Oxford Diffraction Ltd.,'
_computing_data_reduction        'CrysAlis RED, Oxford Diffraction Ltd.,'
_computing_molecular_graphics    Ortep3
_computing_publication_material  Shelx97
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 15.9948
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'OXFORD DIFFRACTION SUPER NOVA'
_diffrn_measurement_method       \w/q-scan
_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  0.0537
_diffrn_reflns_av_unetI/netI     0.0348
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       31
_diffrn_reflns_limit_k_min       -30
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            14087
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        24.999
_diffrn_reflns_theta_max         24.999
_diffrn_reflns_theta_min         3.104
_exptl_absorpt_coefficient_mu    0.101
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.50860
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.37.35 (release 13-08-2014 CrysAlis171 .NET)
(compiled Aug 13 2014,18:06:01)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            COLOURLESS
_exptl_crystal_density_diffrn    1.373
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       BLOCK
_exptl_crystal_F_000             792
_exptl_crystal_size_max          0.300
_exptl_crystal_size_mid          0.300
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.618
_refine_diff_density_min         -0.553
_refine_diff_density_rms         0.173
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.163
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     253
_refine_ls_number_reflns         3218
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.163
_refine_ls_R_factor_all          0.0788
_refine_ls_R_factor_gt           0.0597
_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^)+(0.1331P)^2^+0.4890P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1934
_refine_ls_wR_factor_ref         0.2293
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2623
_reflns_number_total             3218
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c5ob02400e2.cif
_cod_data_source_block           shelx
_cod_depositor_comments
'Adding full bibliography for 7154875--7154878.cif.'
_cod_database_code               7154878
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.970
_shelx_estimated_absorpt_t_max   0.980
_shelx_res_checksum              64475