Collective synthesis of aspulvinone and its analogues by vinylogous aldol condensation of substituted tetronic acids with aldehydes.
Yu, Xiaotan; Gu, Xiaoxia; Zhao, Yunpeng; Wang, Fengqing; Sun, Weiguang; Qi, Changxing; Gu, Lianghu; Zhang, Yonghui; RSC advances 13 (2023) 4859–4864; doi:10.1039/d2ra08133d

data_7246389
_publ_section_title
;
 Collective synthesis of aspulvinone and its analogues by vinylogous aldol
 condensation of substituted tetronic acids with aldehydes.
;
_journal_issue                   7
_journal_name_full               'RSC advances'
_journal_page_first              4859
_journal_page_last               4864
_journal_paper_doi               10.1039/d2ra08133d
_journal_volume                  13
_journal_year                    2023
_chemical_formula_sum            'C28 H32 O7'
_chemical_formula_weight         480.53
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2022-07-02 deposited with the CCDC.	2023-01-30 downloaded from the CCDC.
;
_cell_angle_alpha                105.807(2)
_cell_angle_beta                 99.945(2)
_cell_angle_gamma                92.702(2)
_cell_formula_units_Z            2
_cell_length_a                   8.3502(2)
_cell_length_b                   11.2071(2)
_cell_length_c                   13.7253(3)
_cell_measurement_reflns_used    16823
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      73.371
_cell_measurement_theta_min      3.416
_cell_volume                     1211.27(5)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.973
_diffrn_measurement_device_type  CCD
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0273
_diffrn_reflns_av_unetI/netI     0.0173
_diffrn_reflns_Laue_measured_fraction_full 0.995
_diffrn_reflns_Laue_measured_fraction_max 0.973
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            25818
_diffrn_reflns_point_group_measured_fraction_full 0.995
_diffrn_reflns_point_group_measured_fraction_max 0.973
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         73.897
_diffrn_reflns_theta_min         3.411
_exptl_absorpt_coefficient_mu    0.770
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.318
_exptl_crystal_description       block
_exptl_crystal_F_000             512
_exptl_crystal_size_max          0.400
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.050
_exptl_transmission_factor_max   0.864
_exptl_transmission_factor_min   0.864
_refine_diff_density_max         0.275
_refine_diff_density_min         -0.238
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.051
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     351
_refine_ls_number_reflns         4775
_refine_ls_number_restraints     108
_refine_ls_restrained_S_all      1.113
_refine_ls_R_factor_all          0.0419
_refine_ls_R_factor_gt           0.0398
_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^)+(0.0600P)^2^+0.4379P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1084
_refine_ls_wR_factor_ref         0.1104
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4485
_reflns_number_total             4775
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d2ra08133d2.cif
_cod_data_source_block           1_a
_cod_database_code               7246389
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.748
_shelx_estimated_absorpt_t_max   0.962
_shelx_res_checksum              32946