Expeditious diastereoselective synthesis of medium ring heterocycle-fused chromenes via tandem 8/9-endo-dig and 8-exo-dig hydroalkoxylation-formal-[4 + 2] cycloaddition.
Gharpure, Santosh J.; Nanda, Santosh K.; Fartade, Dipak J.; Organic & biomolecular chemistry 17 (2019) 8806–8810; doi:10.1039/c9ob02030f

data_7157091
_publ_section_title
;
 Expeditious diastereoselective synthesis of medium ring heterocycle-fused
 chromenes via tandem 8/9-endo-dig and 8-exo-dig
 hydroalkoxylation-formal-[4 + 2] cycloaddition.
;
_journal_issue                   39
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              8806
_journal_page_last               8810
_journal_paper_doi               10.1039/c9ob02030f
_journal_volume                  17
_journal_year                    2019
_chemical_formula_moiety         'C26 H25 N O4 S'
_chemical_formula_sum            'C26 H25 N O4 S'
_chemical_formula_weight         447.53
_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
_atom_sites_solution_primary     direct
_audit_creation_date             2019-05-31
_audit_creation_method
;
Olex2 1.2-ac3
(compiled 2017.08.10 svn.r3458 for OlexSys, GUI svn.r5381)
;
_audit_update_record
;
2019-08-01 deposited with the CCDC.    2019-09-18 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 93.864(5)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.3119(4)
_cell_length_b                   24.2166(14)
_cell_length_c                   11.0613(5)
_cell_measurement_reflns_used    4078
_cell_measurement_temperature    150
_cell_measurement_theta_max      30.7890
_cell_measurement_theta_min      2.4950
_cell_volume                     2221.4(2)
_computing_cell_refinement       'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_data_collection       'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_data_reduction        'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      150
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 28.5714
_diffrn_detector_type            'Rigaku Saturn724+'
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_details
;
List of Runs (angles in degrees, time in seconds):

  # Type    Start    End  Width  t~exp~   \w     \q     \k     \f   Frames
  1  \w    -49.00  70.00   0.50    8.00    --  -20.00  72.00-180.00  238
  2  \w    -59.00 -19.00   0.50    8.00    --  -20.00  72.00 108.00   80
;
_diffrn_measurement_device       'abstract diffractometer'
_diffrn_measurement_device_type
'dtrek-CrysAlisPro-abstract goniometer imported rigaku-d*trek images'
_diffrn_measurement_method       '\w scans'
_diffrn_measurement_specimen_support 'Mitegen 50um'
_diffrn_orient_matrix_type
'CrysAlisPro convention (1999,Acta A55,543-557)'
_diffrn_orient_matrix_UB_11      -0.0088487000
_diffrn_orient_matrix_UB_12      -0.0242095000
_diffrn_orient_matrix_UB_13      0.0349512000
_diffrn_orient_matrix_UB_21      -0.0164687000
_diffrn_orient_matrix_UB_22      0.0165064000
_diffrn_orient_matrix_UB_23      0.0507979000
_diffrn_orient_matrix_UB_31      -0.0834076000
_diffrn_orient_matrix_UB_32      -0.0006239000
_diffrn_orient_matrix_UB_33      -0.0181148000
_diffrn_radiation_collimation    0.3
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0471
_diffrn_reflns_av_unetI/netI     0.0689
_diffrn_reflns_Laue_measured_fraction_full 0.974
_diffrn_reflns_Laue_measured_fraction_max 0.974
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       28
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            6599
_diffrn_reflns_point_group_measured_fraction_full 0.974
_diffrn_reflns_point_group_measured_fraction_max 0.974
_diffrn_reflns_theta_full        24.999
_diffrn_reflns_theta_max         24.999
_diffrn_reflns_theta_min         2.497
_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_current           24.0
_diffrn_source_power             1.2
_diffrn_source_target            Mo
_diffrn_source_type              'Enhance (Mo) X-ray Source'
_diffrn_source_voltage           50.0
_exptl_absorpt_coefficient_mu    0.179
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.59641
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.46 (Rigaku Oxford Diffraction, 2018)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.338
_exptl_crystal_description       block
_exptl_crystal_F_000             944
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.122
_exptl_crystal_size_min          0.042
_refine_diff_density_max         0.284
_refine_diff_density_min         -0.448
_refine_diff_density_rms         0.074
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     291
_refine_ls_number_reflns         3798
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.042
_refine_ls_R_factor_all          0.0697
_refine_ls_R_factor_gt           0.0503
_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^)+(0.0519P)^2^+1.3538P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1139
_refine_ls_wR_factor_ref         0.1321
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3012
_reflns_number_total             3798
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9ob02030f2.cif
_cod_data_source_block           sjg-djf-4-83_mo
_cod_depositor_comments
;
Adding full bibliography for 7157086--7157091.cif.

2025-03-29
Z value and formula fixed to values more according to usual
chemical conventions.                 miguel
;
_cod_original_formula_sum            'C52 H50 N2 O8 S2'
_cod_original_formula_weight         895.06
_cod_original_formula_moiety         '2(C26 H25 N O4 S)'
_cod_original_formula_units_Z            2
_cod_database_code               7157091
_shelx_shelxl_version_number     2014/7
_chemical_oxdiff_formula         'C50 H50 N2 S2 O4 '
_shelx_estimated_absorpt_t_max   0.993
_shelx_estimated_absorpt_t_min   0.967
_reflns_odcompleteness_completeness 84.58
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     31.14
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C10(H10)
2.b Secondary CH2 refined with riding coordinates:
 C8(H8A,H8B), C9(H9A,H9B)
2.c Aromatic/amide H refined with riding coordinates:
 C19(H19), C6(H6), C20(H20), C16(H16), C24(H24), C7(H7), C23(H23), C25(H25),
 C26(H26), C13(H13), C15(H15), C14(H14), C4(H4), C3(H3)
2.d Idealised Me refined as rotating group:
 C11(H11A,H11B,H11C), C1(H1A,H1B,H1C)
;
_shelx_res_checksum              78458
_olex2_submission_special_instructions 'No special instructions were received'
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
- Detector area scaling
;
_oxdiff_exptl_absorpt_empirical_full_max 1.418
_oxdiff_exptl_absorpt_empirical_full_min 0.565