One-pot construction of dispirocyclohexanes via K<sub>2</sub>CO<sub>3</sub>-mediated desulfonylative Michael-Michael-aldol (2 + 2 + 2) annulation of sulfonyl 2-pyridyl flavanones and methylketones.
Chang, Meng-Yang; Chen, Kuan-Ting; Chen, Han-Yu; Organic & biomolecular chemistry 18 (2020) 6297–6311; doi:10.1039/d0ob01404d

data_7157612
_publ_section_title
;
 One-pot construction of dispirocyclohexanes via
 K<sub>2</sub>CO<sub>3</sub>-mediated desulfonylative
 Michael-Michael-aldol (2 + 2 + 2) annulation of sulfonyl 2-pyridyl
 flavanones and methylketones.
;
_journal_issue                   32
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              6297
_journal_page_last               6311
_journal_paper_doi               10.1039/d0ob01404d
_journal_volume                  18
_journal_year                    2020
_chemical_formula_sum            'C21 H16 Br N O4 S'
_chemical_formula_weight         458.32
_space_group_crystal_system      monoclinic
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_space_group_name_Hall           '-P 2ybc'
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_audit_update_record
;
2019-11-15 deposited with the CCDC.	2020-07-24 downloaded from the CCDC.
;
_cell_angle_alpha                90
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_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
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_exptl_absorpt_correction_type   multi-scan
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_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.616
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Lump
_exptl_crystal_F_000             928
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.17
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_refine_ls_extinction_method     none
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_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     254
_refine_ls_number_reflns         3930
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0372
_refine_ls_R_factor_gt           0.0278
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0239P)^2^+1.5307P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0598
_refine_ls_wR_factor_ref         0.0629
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3352
_reflns_number_total             3930
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0ob01404d2.cif
_cod_data_source_block           mo_180138LT_0m
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_crystal_density_meas' value 'not measured' was
changed to '?' -- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 7556 2019-12-06 15:28:31Z antanas 

 Adding full bibliography for 7157612--7157619.cif.
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7157612
_shelxl_version_number           2014/6
_shelx_res_checksum              23042
_shelx_hkl_checksum              42187