Protecting-Group-Free Syntheses of <i>ent</i>-Kaurane Diterpenoids: [3+2+1] Cycloaddition/Cycloalkenylation Approach.
Wang, Jin; Hong, Benke; Hu, Dachao; Kadonaga, Yuichiro; Tang, Ruyao; Lei, Xiaoguang; Journal of the American Chemical Society  (2020) –; doi:10.1021/jacs.9b13722

data_4134080
_publ_section_title
;
 Protecting-Group-Free Syntheses of <i>ent</i>-Kaurane Diterpenoids:
 [3+2+1] Cycloaddition/Cycloalkenylation Approach.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.9b13722
_journal_year                    2020
_chemical_formula_sum            'C20 H30 O2'
_chemical_formula_weight         302.44
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 102.596(2)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   20.4927(5)
_cell_length_b                   13.2198(3)
_cell_length_c                   12.8593(3)
_cell_measurement_reflns_used    8393
_cell_measurement_temperature    180.00(10)
_cell_measurement_theta_max      29.5150
_cell_measurement_theta_min      2.3120
_cell_volume                     3399.86(14)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      180.00(10)
_diffrn_detector                 'CCD plate'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'XtaLAB AFC12 (RINC): Kappa single'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0361
_diffrn_reflns_av_unetI/netI     0.0420
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            27165
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.484
_diffrn_reflns_theta_min         2.307
_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_type              'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.70434
_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    1.182
_exptl_crystal_description       block
_exptl_crystal_F_000             1328
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.348
_refine_diff_density_min         -0.272
_refine_diff_density_rms         0.067
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.058
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     407
_refine_ls_number_reflns         7778
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.058
_refine_ls_R_factor_all          0.0687
_refine_ls_R_factor_gt           0.0485
_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^)+(0.0706P)^2^+0.6027P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1279
_refine_ls_wR_factor_ref         0.1381
_reflns_Friedel_coverage         0.000
_reflns_number_gt                5919
_reflns_number_total             7778
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja9b13722_si_009.cif
_cod_data_source_block           3
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4134080
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              26477
_shelx_hkl_checksum              53496