Sequential Mukaiyama-Michael reaction induced by carbon acids.
Yanai, Hikaru; Kobayashi, Osamu; Takada, Kenji; Isono, Takuya; Satoh, Toshifumi; Matsumoto, Takashi; Chemical communications (Cambridge, England) 52 (2016) 3280–3283; doi:10.1039/c5cc10115h

data_7118369
_publ_section_title
;
 Sequential Mukaiyama-Michael reaction induced by carbon acids.
;
_journal_issue                   16
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              3280
_journal_page_last               3283
_journal_paper_doi               10.1039/c5cc10115h
_journal_volume                  52
_journal_year                    2016
_chemical_formula_moiety         'C22 H20 O6'
_chemical_formula_sum            'C22 H20 O6'
_chemical_formula_weight         380.38
_chemical_melting_point          86.0
_chemical_name_systematic
;
Ethyl 2-((2S*,3'R*,4'S*)-2',4-dioxo-[2,3'-bichroman]-4'-yl)acetate
;
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             'January 29 2015'
_audit_creation_method           SHELXL-97
_audit_update_record
;
2015-12-03 deposited with the CCDC.
2015-12-21 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   34.732(4)
_cell_length_b                   13.1317(14)
_cell_length_c                   8.2791(9)
_cell_measurement_reflns_used    5244
_cell_measurement_temperature    90
_cell_measurement_theta_max      26.21
_cell_measurement_theta_min      2.35
_cell_volume                     3776.0(7)
_computing_cell_refinement       'APEX2 (Bruker AXS, 2006)'
_computing_data_collection       'APEX2 (Bruker AXS, 2006)'
_computing_data_reduction        'SAINT (Bruker AXS, 2004)'
_computing_molecular_graphics    'XSHEL (Bruker AXS,2002)'
_computing_publication_material  'XCIF (Bruker AXS, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      90
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEXII CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  'Bruker Helios multilayer confocal mirror'
_diffrn_radiation_source         'Bruker TXS fine-focus rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0324
_diffrn_reflns_av_sigmaI/netI    0.0381
_diffrn_reflns_limit_h_max       39
_diffrn_reflns_limit_h_min       -41
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            17978
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         1.17
_exptl_absorpt_coefficient_mu    0.098
_exptl_absorpt_correction_T_max  0.9951
_exptl_absorpt_correction_T_min  0.9827
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
Crystal Faces plugin in Bruker APEX2 software
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.338
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1600
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.150
_refine_diff_density_min         -0.163
_refine_diff_density_rms         0.034
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.1(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.003
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     507
_refine_ls_number_reflns         6383
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.002
_refine_ls_R_factor_all          0.0394
_refine_ls_R_factor_gt           0.0330
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0377P)^2^+0.5188P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0722
_refine_ls_wR_factor_ref         0.0754
_reflns_number_gt                5777
_reflns_number_total             6383
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c5cc10115h2.cif
_cod_data_source_block           anti-17a
_cod_depositor_comments
'Adding full bibliography for 7118367--7118375.cif.'
_cod_original_sg_symbol_Hall     'P 2c -2ac '
_cod_original_sg_symbol_H-M      'P c a 21    '
_cod_database_code               7118369