Convergent Route to ent-Kaurane Diterpenoids: Total Synthesis of Lungshengenin D and 1α,6α-Diacetoxy-ent-kaura-9(11),16-dien-12,15-dione.
Zhao, Xiangbo; Li, Wu; Wang, Junjie; Ma, Dawei; Journal of the American Chemical Society 139 (2017) 2932–2935; doi:10.1021/jacs.7b00140

data_4125663
_publ_section_title
;
 Convergent Route to ent-Kaurane Diterpenoids: Total Synthesis of
 Lungshengenin D and
 1\a,6\a-Diacetoxy-ent-kaura-9(11),16-dien-12,15-dione.
;
_journal_issue                   8
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              2932
_journal_page_last               2935
_journal_paper_doi               10.1021/jacs.7b00140
_journal_volume                  139
_journal_year                    2017
_chemical_formula_moiety         'C22 H30 O4'
_chemical_formula_sum            'C22 H30 O4'
_chemical_formula_weight         358.46
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             2014-08-18
_audit_creation_method
; 
Olex2 1.2 
(compiled 2014.07.22 svn.r2960 for OlexSys, GUI svn.r4862) 
;
_cell_angle_alpha                84.679(2)
_cell_angle_beta                 80.262(2)
_cell_angle_gamma                67.698(2)
_cell_formula_units_Z            2
_cell_length_a                   7.7145(9)
_cell_length_b                   9.0116(11)
_cell_length_c                   14.7861(17)
_cell_measurement_reflns_used    2775
_cell_measurement_temperature    130
_cell_measurement_theta_max      30.45
_cell_measurement_theta_min      2.44
_cell_volume                     936.87(19)
_computing_cell_refinement       'SAINT v7.68A (Bruker, 2009)'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'SAINT v7.68A (Bruker, 2009)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      130
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0192
_diffrn_reflns_av_unetI/netI     0.0386
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.989
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            9665
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.989
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.752
_diffrn_reflns_theta_min         1.398
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.7461
_exptl_absorpt_correction_T_min  0.6528
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
SADABS-2008/1 (Bruker,2008) was used for absorption correction. 
wR2(int) was 0.0603 before and 0.0311 after correction. 
The Ratio of minimum to maximum transmission is 0.8749. 
The \l/2 correction factor is 0.0015. 
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.271
_exptl_crystal_description       block
_exptl_crystal_F_000             388
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.375
_refine_diff_density_min         -0.225
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.028
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     239
_refine_ls_number_reflns         5760
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.0624
_refine_ls_R_factor_gt           0.0464
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0647P)^2^+0.1307P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1159
_refine_ls_wR_factor_ref         0.1269
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4426
_reflns_number_total             5760
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b00140_si_002.cif
_cod_data_source_block           mo_dm14461_0m
_cod_database_code               4125663
_shelxl_version_number           2014-3
_shelx_estimated_absorpt_t_max   0.993
_shelx_estimated_absorpt_t_min   0.978
_olex2_refinement_description
; 
1. Fixed Uiso 
 At 1.2 times of: 
  All C(H) groups, All C(H,H) groups 
 At 1.5 times of: 
  All C(H,H,H) groups 
2.a Ternary CH refined with riding coordinates: 
 C5(H5), C6(H6), C9(H9), C13(H13) 
2.b Secondary CH2 refined with riding coordinates: 
 C2(H2A,H2B), C3(H3A,H3B), C7(H7A,H7B), C11(H11A,H11B), C15(H15A,H15B), 
 C17(H17A,H17B) 
2.c X=CH2 refined with riding coordinates: 
 C16(H16A,H16B) 
2.d Idealised Me refined as rotating group: 
 C18(H18A,H18B,H18C), C19(H19A,H19B,H19C), C21(H21A,H21B,H21C), C22(H22A,H22B, 
 H22C) 
;
_shelx_res_checksum              85596
_shelx_hkl_checksum              82121
_olex2_submission_special_instructions 'No special instructions were received'