Total Synthesis of Terpenoids Employing a "Benzannulation of Carvone" Strategy: Synthesis of (-)-Crotogoudin.
Finkbeiner, Peter; Murai, Kenichi; Röpke, Michael; Sarpong, Richmond; Journal of the American Chemical Society 139 (2017) 11349–11352; doi:10.1021/jacs.7b06823

data_4131565
_publ_section_title
;
 Total Synthesis of Terpenoids Employing a &quot;Benzannulation of
 Carvone&quot; Strategy: Synthesis of (-)-Crotogoudin.
;
_journal_issue                   33
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11349
_journal_page_last               11352
_journal_paper_doi               10.1021/jacs.7b06823
_journal_volume                  139
_journal_year                    2017
_chemical_absolute_configuration ad
_chemical_formula_sum            'C20 H26 O3'
_chemical_formula_weight         314.41
_chemical_name_common            PF156
_chemical_name_systematic        sarpong138
_space_group.centring_type       C-centered
_space_group_crystal_system      orthorhombic
_space_group_IT_number           20
_space_group_name_Hall           'C 2c 2'
_space_group_name_H-M_alt        'C 2 2 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     iterative
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2016/6
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   9.2436(4)
_cell_length_b                   10.9618(4)
_cell_length_c                   34.6834(15)
_cell_measurement_reflns_used    9895
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      68.66
_cell_measurement_theta_min      2.55
_cell_volume                     3514.3(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    ORTEP-32
_computing_publication_material  WinGX
_computing_structure_refinement  SHELXL-2016
_computing_structure_solution    SHELXT-2014
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0872
_diffrn_reflns_av_unetI/netI     0.0476
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_refln_scan_rate          10
_diffrn_refln_scan_width         2.0
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       41
_diffrn_reflns_limit_l_min       -41
_diffrn_reflns_number            33148
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        67.000
_diffrn_reflns_theta_max         68.670
_diffrn_reflns_theta_min         2.548
_diffrn_source                   'microfocus rotating anode'
_exptl_absorpt_coefficient_mu    0.621
_exptl_absorpt_correction_T_max  0.929
_exptl_absorpt_correction_T_min  0.746
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.188
_exptl_crystal_description       plate
_exptl_crystal_F_000             1360
_exptl_crystal_size_max          0.060
_exptl_crystal_size_mid          0.050
_exptl_crystal_size_min          0.020
_refine_diff_density_max         0.199
_refine_diff_density_min         -0.246
_refine_diff_density_rms         0.053
_refine_ls_abs_structure_details
; 
 Flack x determined using 1121 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   0.02(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.127
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     213
_refine_ls_number_reflns         3240
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.127
_refine_ls_R_factor_all          0.0704
_refine_ls_R_factor_gt           0.0664
_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^)+10.8727P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1451
_refine_ls_wR_factor_ref         0.1468
_reflns_Friedel_coverage         0.756
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.989
_reflns_number_gt                3007
_reflns_number_total             3240
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b06823_si_002.cif
_cod_data_source_block           sarpong138
_cod_database_code               4131565
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_min   0.964
_shelx_estimated_absorpt_t_max   0.988
_shelx_res_checksum              5170
_shelx_hkl_checksum              90573