Unified Enantioselective, Convergent Synthetic Approach toward the Furanobutenolide-Derived Polycyclic Norcembranoid Diterpenes: Synthesis of a Series of Ineleganoloids by Oxidation-State Manipulation of the Carbocyclic Core.
Craig, 2nd, Robert A; Smith, Russell C.; Roizen, Jennifer L.; Jones, Amanda C.; Virgil, Scott C.; Stoltz, Brian M.; The Journal of organic chemistry 84 (2019) 7722–7746; doi:10.1021/acs.joc.9b00635

data_4034675
_publ_section_title
;
 Unified Enantioselective, Convergent Synthetic Approach toward the
 Furanobutenolide-Derived Polycyclic Norcembranoid Diterpenes: Synthesis
 of a Series of Ineleganoloids by Oxidation-State Manipulation of the
 Carbocyclic Core.
;
_journal_issue                   12
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              7722
_journal_page_last               7746
_journal_paper_doi               10.1021/acs.joc.9b00635
_journal_volume                  84
_journal_year                    2019
_chemical_absolute_configuration ad
_chemical_formula_sum            'C19 H23.76 Cl0.24 O5'
_chemical_formula_weight         340.56
_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   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/6
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.6417(3)
_cell_length_b                   10.7582(5)
_cell_length_c                   22.9878(11)
_cell_measurement_reflns_used    9911
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      74.63
_cell_measurement_theta_min      3.85
_cell_volume                     1642.54(13)
_computing_cell_refinement       'SAINT v8.34A (Bruker-AXS, 2007)'
_computing_data_collection       'APEX2 v2014.7-1 (Bruker-AXS, 2014)'
_computing_data_reduction        'SAINT v8.34A (Bruker-AXS, 2007)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2014/6 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-2013/1 (Sheldrick, 2013)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.24
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker D8 VENTURE Kappa Duo PHOTON 100 CMOS'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0393
_diffrn_reflns_av_unetI/netI     0.0263
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            18385
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.995
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         74.625
_diffrn_reflns_theta_min         3.846
_diffrn_source                   'I\mS HB micro-focus sealed tube'
_exptl_absorpt_coefficient_mu    1.151
_exptl_absorpt_correction_T_max  0.7538
_exptl_absorpt_correction_T_min  0.6487
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS-2014/3 (Sheldrick, 2014)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.377
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             727
_exptl_crystal_size_max          0.350
_exptl_crystal_size_mid          0.150
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.223
_refine_diff_density_min         -0.189
_refine_diff_density_rms         0.041
_refine_ls_abs_structure_details
; 
 Flack x determined using 1318 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   0.042(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.002
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     232
_refine_ls_number_reflns         3362
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.002
_refine_ls_R_factor_all          0.0351
_refine_ls_R_factor_gt           0.0336
_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^)+(0.0403P)^2^+0.7206P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0822
_refine_ls_wR_factor_ref         0.0831
_reflns_Friedel_coverage         0.712
_reflns_Friedel_fraction_full    0.995
_reflns_Friedel_fraction_max     0.991
_reflns_number_gt                3250
_reflns_number_total             3362
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo9b00635_si_006.cif
_cod_data_source_block           P14028
_cod_database_code               4034675
_shelx_estimated_absorpt_t_min   0.689
_shelx_estimated_absorpt_t_max   0.945
_shelxl_version_number           2014/6
_shelx_res_checksum              54983
_shelx_hkl_checksum              53857