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_7157614
_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            'C33 H27 Br2 N2 O5'
_chemical_formula_weight         691.38
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_audit_update_record
;
2019-11-15 deposited with the CCDC.	2020-07-24 downloaded from the CCDC.
;
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_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
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_exptl_crystal_colour            Colorless
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_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Lump
_exptl_crystal_F_000             1396
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_refine_ls_restrained_S_all      1.017
_refine_ls_R_factor_all          0.1029
_refine_ls_R_factor_gt           0.0504
_refine_ls_shift/su_max          0.020
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0620P)^2^+3.7372P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1123
_refine_ls_wR_factor_ref         0.1318
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4187
_reflns_number_total             6408
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0ob01404d2.cif
_cod_data_source_block           twin5
_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_cell_volume        2862.6(7)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7157614
_shelxl_version_number           2014/6
_shelx_res_checksum              54130
_shelx_hkl_checksum              13875