Total Synthesis of (-)-Batrachotoxinin A: A Local-Desymmetrization Approach.
Guo, Yinliang; Guo, Zhixian; Lu, Jia-Tian; Fang, Runting; Chen, Si-Cong; Luo, Tuoping; Journal of the American Chemical Society 142 (2020) 3675–3679; doi:10.1021/jacs.9b12882

data_4134185
_publ_section_title
;
 Total Synthesis of (-)-Batrachotoxinin A: A Local-Desymmetrization
 Approach.
;
_journal_issue                   8
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              3675
_journal_page_last               3679
_journal_paper_doi               10.1021/jacs.9b12882
_journal_volume                  142
_journal_year                    2020
_chemical_absolute_configuration ad
_chemical_formula_sum            'C19 H22 O5'
_chemical_formula_weight         330.36
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.2617(2)
_cell_length_b                   10.1190(3)
_cell_length_c                   19.4887(5)
_cell_measurement_reflns_used    9111
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      74.8010
_cell_measurement_theta_min      4.5210
_cell_volume                     1629.26(8)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 10.3914
_diffrn_detector_type            Atlas
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at home/near, Atlas'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0440
_diffrn_reflns_av_unetI/netI     0.0192
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            22983
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        66.595
_diffrn_reflns_theta_max         66.595
_diffrn_reflns_theta_min         4.537
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'SuperNova (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    0.796
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.58813
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.29a (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.347
_exptl_crystal_description       sheet-like
_exptl_crystal_F_000             704
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.264
_refine_diff_density_min         -0.166
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details
;
 Flack x determined using 1085 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.01(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.026
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         2869
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.026
_refine_ls_R_factor_all          0.0404
_refine_ls_R_factor_gt           0.0372
_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^)+(0.0627P)^2^+0.1973P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0967
_refine_ls_wR_factor_ref         0.1003
_reflns_Friedel_coverage         0.720
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                2689
_reflns_number_total             2869
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja9b12882_si_010.cif
_cod_data_source_block           3
_cod_depositor_comments
'Adding full bibliography for 4134185--4134193.cif.'
_cod_database_code               4134185
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              19895
_shelx_hkl_checksum              81230